Answer:
Explanation:
Explanation
NEW QUESTION: 2
ネットワーク技術者は、システムエンジニアがシミュレートされた実稼働環境でパッチと更新をテストするための新しいラボネットワークをインストールしています。エンジニアは、ラボネットワークがインターネットに無制限にアクセスできるように要求しましたが、LANからシステムエンジニアのみへの接続を制限したいと考えています。これらの要件を満たすために、技術者が最も実装する可能性が高いのは次のうちどれですか？
A. スイッチ
B. プロキシサーバー
C. ファイアウォール
D. 短縮
Answer: C
NEW QUESTION: 3
Answer:
Explanation:
Explanation
NEW QUESTION: 4
A server with the IP address of 10.10.2.4 has been having intermittent connection issues. The logs show repeated connection attempts from the following IPs:
10.10.3.16
10.10.3.23
212.178.24.26
217.24.94.83
These attempts are overloading the server to the point that it cannot respond to traffic. Which of the following attacks is occurring?
A. DDoS
B. XSS
C. Xmas
D. DoS
Answer: A
Explanation:
A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer.
One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable.
Such attacks usually lead to a server overload.
A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems
(for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time.
Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.
Incorrect Answers:
A. Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users.
Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user.
This is not what is described in the question.
C. The question states that the source of the traffic is multiple IP addresses. Therefore, this is a DDoS (Distributed
Denial of Service) attack. A DoS (Denial of Service) attack comes from a single IP address.
D. Some stateless firewalls only check against security policy those packets which have the SYN flag set (that is, packets that initiate connection according to the standards). Since Christmas tree scan packets do not have the SYN flag turned on, they can pass through these simple systems and reach the target host.
A large number of Christmas tree packets can also be used to conduct a DoS attack by exploiting the fact that
Christmas tree packets require much more processing by routers and end-hosts than the 'usual' packets do.
This is not what is described in the question.
References:
http://en.wikipedia.org/wiki/Denial-of-service_attack
http://www.answers.com/Q/What_is_an_XMAS_attack_on_a_computer
http://en.wikipedia.org/wiki/Cross-site_scripting
NEW QUESTION: 2
ネットワーク技術者は、システムエンジニアがシミュレートされた実稼働環境でパッチと更新をテストするための新しいラボネットワークをインストールしています。エンジニアは、ラボネットワークがインターネットに無制限にアクセスできるように要求しましたが、LANからシステムエンジニアのみへの接続を制限したいと考えています。これらの要件を満たすために、技術者が最も実装する可能性が高いのは次のうちどれですか？
A. スイッチ
B. プロキシサーバー
C. ファイアウォール
D. 短縮
Answer: C
NEW QUESTION: 3
Answer:
Explanation:
Explanation
NEW QUESTION: 4
A server with the IP address of 10.10.2.4 has been having intermittent connection issues. The logs show repeated connection attempts from the following IPs:
10.10.3.16
10.10.3.23
212.178.24.26
217.24.94.83
These attempts are overloading the server to the point that it cannot respond to traffic. Which of the following attacks is occurring?
A. DDoS
B. XSS
C. Xmas
D. DoS
Answer: A
Explanation:
A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer.
One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable.
Such attacks usually lead to a server overload.
A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems
(for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time.
Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.
Incorrect Answers:
A. Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users.
Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user.
This is not what is described in the question.
C. The question states that the source of the traffic is multiple IP addresses. Therefore, this is a DDoS (Distributed
Denial of Service) attack. A DoS (Denial of Service) attack comes from a single IP address.
D. Some stateless firewalls only check against security policy those packets which have the SYN flag set (that is, packets that initiate connection according to the standards). Since Christmas tree scan packets do not have the SYN flag turned on, they can pass through these simple systems and reach the target host.
A large number of Christmas tree packets can also be used to conduct a DoS attack by exploiting the fact that
Christmas tree packets require much more processing by routers and end-hosts than the 'usual' packets do.
This is not what is described in the question.
References:
http://en.wikipedia.org/wiki/Denial-of-service_attack
http://www.answers.com/Q/What_is_an_XMAS_attack_on_a_computer
http://en.wikipedia.org/wiki/Cross-site_scripting
NEW QUESTION: 2
ネットワーク技術者は、システムエンジニアがシミュレートされた実稼働環境でパッチと更新をテストするための新しいラボネットワークをインストールしています。エンジニアは、ラボネットワークがインターネットに無制限にアクセスできるように要求しましたが、LANからシステムエンジニアのみへの接続を制限したいと考えています。これらの要件を満たすために、技術者が最も実装する可能性が高いのは次のうちどれですか？
A. スイッチ
B. プロキシサーバー
C. ファイアウォール
D. 短縮
Answer: C
NEW QUESTION: 3
Answer:
Explanation:
Explanation
NEW QUESTION: 4
A server with the IP address of 10.10.2.4 has been having intermittent connection issues. The logs show repeated connection attempts from the following IPs:
10.10.3.16
10.10.3.23
212.178.24.26
217.24.94.83
These attempts are overloading the server to the point that it cannot respond to traffic. Which of the following attacks is occurring?
A. DDoS
B. XSS
C. Xmas
D. DoS
Answer: A
Explanation:
A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer.
One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable.
Such attacks usually lead to a server overload.
A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems
(for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time.
Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.
Incorrect Answers:
A. Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users.
Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user.
This is not what is described in the question.
C. The question states that the source of the traffic is multiple IP addresses. Therefore, this is a DDoS (Distributed
Denial of Service) attack. A DoS (Denial of Service) attack comes from a single IP address.
D. Some stateless firewalls only check against security policy those packets which have the SYN flag set (that is, packets that initiate connection according to the standards). Since Christmas tree scan packets do not have the SYN flag turned on, they can pass through these simple systems and reach the target host.
A large number of Christmas tree packets can also be used to conduct a DoS attack by exploiting the fact that
Christmas tree packets require much more processing by routers and end-hosts than the 'usual' packets do.
This is not what is described in the question.
References:
http://en.wikipedia.org/wiki/Denial-of-service_attack
http://www.answers.com/Q/What_is_an_XMAS_attack_on_a_computer
http://en.wikipedia.org/wiki/Cross-site_scripting
![0-1]42[1234]<br/><strong>C.</strong> 1515[ pdf](https://www.testsdumps.com/_/tsds/imgs/pdf.jpg)
![0-1]42[1234]<br/><strong>C.</strong> 1515[ Online Test Engine](https://www.testsdumps.com/_/tsds/imgs/freeonline.jpg)
Online Test Engine supports Windows / Mac / Android / iOS, etc., because it is the software based on WEB browser.
NEW QUESTION: 2
ネットワーク技術者は、システムエンジニアがシミュレートされた実稼働環境でパッチと更新をテストするための新しいラボネットワークをインストールしています。エンジニアは、ラボネットワークがインターネットに無制限にアクセスできるように要求しましたが、LANからシステムエンジニアのみへの接続を制限したいと考えています。これらの要件を満たすために、技術者が最も実装する可能性が高いのは次のうちどれですか？
A. スイッチ
B. プロキシサーバー
C. ファイアウォール
D. 短縮
Answer: C
NEW QUESTION: 3
Answer:
Explanation:
Explanation
NEW QUESTION: 4
A server with the IP address of 10.10.2.4 has been having intermittent connection issues. The logs show repeated connection attempts from the following IPs:
10.10.3.16
10.10.3.23
212.178.24.26
217.24.94.83
These attempts are overloading the server to the point that it cannot respond to traffic. Which of the following attacks is occurring?
A. DDoS
B. XSS
C. Xmas
D. DoS
Answer: A
Explanation:
A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer.
One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable.
Such attacks usually lead to a server overload.
A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems
(for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time.
Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.
Incorrect Answers:
A. Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users.
Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user.
This is not what is described in the question.
C. The question states that the source of the traffic is multiple IP addresses. Therefore, this is a DDoS (Distributed
Denial of Service) attack. A DoS (Denial of Service) attack comes from a single IP address.
D. Some stateless firewalls only check against security policy those packets which have the SYN flag set (that is, packets that initiate connection according to the standards). Since Christmas tree scan packets do not have the SYN flag turned on, they can pass through these simple systems and reach the target host.
A large number of Christmas tree packets can also be used to conduct a DoS attack by exploiting the fact that
Christmas tree packets require much more processing by routers and end-hosts than the 'usual' packets do.
This is not what is described in the question.
References:
http://en.wikipedia.org/wiki/Denial-of-service_attack
http://www.answers.com/Q/What_is_an_XMAS_attack_on_a_computer
http://en.wikipedia.org/wiki/Cross-site_scripting
![0-1]42[1234]<br/><strong>C.</strong> 1515[ Testing Engine](https://www.testsdumps.com/_/tsds/imgs/product.png)
NEW QUESTION: 2
ネットワーク技術者は、システムエンジニアがシミュレートされた実稼働環境でパッチと更新をテストするための新しいラボネットワークをインストールしています。エンジニアは、ラボネットワークがインターネットに無制限にアクセスできるように要求しましたが、LANからシステムエンジニアのみへの接続を制限したいと考えています。これらの要件を満たすために、技術者が最も実装する可能性が高いのは次のうちどれですか？
A. スイッチ
B. プロキシサーバー
C. ファイアウォール
D. 短縮
Answer: C
NEW QUESTION: 3
Answer:
Explanation:
Explanation
NEW QUESTION: 4
A server with the IP address of 10.10.2.4 has been having intermittent connection issues. The logs show repeated connection attempts from the following IPs:
10.10.3.16
10.10.3.23
212.178.24.26
217.24.94.83
These attempts are overloading the server to the point that it cannot respond to traffic. Which of the following attacks is occurring?
A. DDoS
B. XSS
C. Xmas
D. DoS
Answer: A
Explanation:
A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer.
One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable.
Such attacks usually lead to a server overload.
A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems
(for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time.
Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.
Incorrect Answers:
A. Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users.
Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user.
This is not what is described in the question.
C. The question states that the source of the traffic is multiple IP addresses. Therefore, this is a DDoS (Distributed
Denial of Service) attack. A DoS (Denial of Service) attack comes from a single IP address.
D. Some stateless firewalls only check against security policy those packets which have the SYN flag set (that is, packets that initiate connection according to the standards). Since Christmas tree scan packets do not have the SYN flag turned on, they can pass through these simple systems and reach the target host.
A large number of Christmas tree packets can also be used to conduct a DoS attack by exploiting the fact that
Christmas tree packets require much more processing by routers and end-hosts than the 'usual' packets do.
This is not what is described in the question.
References:
http://en.wikipedia.org/wiki/Denial-of-service_attack
http://www.answers.com/Q/What_is_an_XMAS_attack_on_a_computer
http://en.wikipedia.org/wiki/Cross-site_scripting
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NEW QUESTION: 1
An IP phone user has dialed "15152421234". Which route pattern will be used?
A. 1515[
NEW QUESTION: 2
ネットワーク技術者は、システムエンジニアがシミュレートされた実稼働環境でパッチと更新をテストするための新しいラボネットワークをインストールしています。エンジニアは、ラボネットワークがインターネットに無制限にアクセスできるように要求しましたが、LANからシステムエンジニアのみへの接続を制限したいと考えています。これらの要件を満たすために、技術者が最も実装する可能性が高いのは次のうちどれですか？
A. スイッチ
B. プロキシサーバー
C. ファイアウォール
D. 短縮
Answer: C
NEW QUESTION: 3
Answer:
Explanation:
Explanation
NEW QUESTION: 4
A server with the IP address of 10.10.2.4 has been having intermittent connection issues. The logs show repeated connection attempts from the following IPs:
10.10.3.16
10.10.3.23
212.178.24.26
217.24.94.83
These attempts are overloading the server to the point that it cannot respond to traffic. Which of the following attacks is occurring?
A. DDoS
B. XSS
C. Xmas
D. DoS
Answer: A
Explanation:
A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer.
One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable.
Such attacks usually lead to a server overload.
A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems
(for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time.
Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.
Incorrect Answers:
A. Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users.
Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user.
This is not what is described in the question.
C. The question states that the source of the traffic is multiple IP addresses. Therefore, this is a DDoS (Distributed
Denial of Service) attack. A DoS (Denial of Service) attack comes from a single IP address.
D. Some stateless firewalls only check against security policy those packets which have the SYN flag set (that is, packets that initiate connection according to the standards). Since Christmas tree scan packets do not have the SYN flag turned on, they can pass through these simple systems and reach the target host.
A large number of Christmas tree packets can also be used to conduct a DoS attack by exploiting the fact that
Christmas tree packets require much more processing by routers and end-hosts than the 'usual' packets do.
This is not what is described in the question.
References:
http://en.wikipedia.org/wiki/Denial-of-service_attack
http://www.answers.com/Q/What_is_an_XMAS_attack_on_a_computer
http://en.wikipedia.org/wiki/Cross-site_scripting
NEW QUESTION: 2
ネットワーク技術者は、システムエンジニアがシミュレートされた実稼働環境でパッチと更新をテストするための新しいラボネットワークをインストールしています。エンジニアは、ラボネットワークがインターネットに無制限にアクセスできるように要求しましたが、LANからシステムエンジニアのみへの接続を制限したいと考えています。これらの要件を満たすために、技術者が最も実装する可能性が高いのは次のうちどれですか？
A. スイッチ
B. プロキシサーバー
C. ファイアウォール
D. 短縮
Answer: C
NEW QUESTION: 3
Answer:
Explanation:
Explanation
NEW QUESTION: 4
A server with the IP address of 10.10.2.4 has been having intermittent connection issues. The logs show repeated connection attempts from the following IPs:
10.10.3.16
10.10.3.23
212.178.24.26
217.24.94.83
These attempts are overloading the server to the point that it cannot respond to traffic. Which of the following attacks is occurring?
A. DDoS
B. XSS
C. Xmas
D. DoS
Answer: A
Explanation:
A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer.
One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable.
Such attacks usually lead to a server overload.
A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems
(for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time.
Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.
Incorrect Answers:
A. Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users.
Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user.
This is not what is described in the question.
C. The question states that the source of the traffic is multiple IP addresses. Therefore, this is a DDoS (Distributed
Denial of Service) attack. A DoS (Denial of Service) attack comes from a single IP address.
D. Some stateless firewalls only check against security policy those packets which have the SYN flag set (that is, packets that initiate connection according to the standards). Since Christmas tree scan packets do not have the SYN flag turned on, they can pass through these simple systems and reach the target host.
A large number of Christmas tree packets can also be used to conduct a DoS attack by exploiting the fact that
Christmas tree packets require much more processing by routers and end-hosts than the 'usual' packets do.
This is not what is described in the question.
References:
http://en.wikipedia.org/wiki/Denial-of-service_attack
http://www.answers.com/Q/What_is_an_XMAS_attack_on_a_computer
http://en.wikipedia.org/wiki/Cross-site_scripting
NEW QUESTION: 2
ネットワーク技術者は、システムエンジニアがシミュレートされた実稼働環境でパッチと更新をテストするための新しいラボネットワークをインストールしています。エンジニアは、ラボネットワークがインターネットに無制限にアクセスできるように要求しましたが、LANからシステムエンジニアのみへの接続を制限したいと考えています。これらの要件を満たすために、技術者が最も実装する可能性が高いのは次のうちどれですか？
A. スイッチ
B. プロキシサーバー
C. ファイアウォール
D. 短縮
Answer: C
NEW QUESTION: 3
Answer:
Explanation:
Explanation
NEW QUESTION: 4
A server with the IP address of 10.10.2.4 has been having intermittent connection issues. The logs show repeated connection attempts from the following IPs:
10.10.3.16
10.10.3.23
212.178.24.26
217.24.94.83
These attempts are overloading the server to the point that it cannot respond to traffic. Which of the following attacks is occurring?
A. DDoS
B. XSS
C. Xmas
D. DoS
Answer: A
Explanation:
A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer.
One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable.
Such attacks usually lead to a server overload.
A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems
(for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time.
Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.
Incorrect Answers:
A. Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users.
Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user.
This is not what is described in the question.
C. The question states that the source of the traffic is multiple IP addresses. Therefore, this is a DDoS (Distributed
Denial of Service) attack. A DoS (Denial of Service) attack comes from a single IP address.
D. Some stateless firewalls only check against security policy those packets which have the SYN flag set (that is, packets that initiate connection according to the standards). Since Christmas tree scan packets do not have the SYN flag turned on, they can pass through these simple systems and reach the target host.
A large number of Christmas tree packets can also be used to conduct a DoS attack by exploiting the fact that
Christmas tree packets require much more processing by routers and end-hosts than the 'usual' packets do.
This is not what is described in the question.
References:
http://en.wikipedia.org/wiki/Denial-of-service_attack
http://www.answers.com/Q/What_is_an_XMAS_attack_on_a_computer
http://en.wikipedia.org/wiki/Cross-site_scripting
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Answer: D
NEW QUESTION: 2
ネットワーク技術者は、システムエンジニアがシミュレートされた実稼働環境でパッチと更新をテストするための新しいラボネットワークをインストールしています。エンジニアは、ラボネットワークがインターネットに無制限にアクセスできるように要求しましたが、LANからシステムエンジニアのみへの接続を制限したいと考えています。これらの要件を満たすために、技術者が最も実装する可能性が高いのは次のうちどれですか？
A. スイッチ
B. プロキシサーバー
C. ファイアウォール
D. 短縮
Answer: C
NEW QUESTION: 3
Answer:
Explanation:
Explanation
NEW QUESTION: 4
A server with the IP address of 10.10.2.4 has been having intermittent connection issues. The logs show repeated connection attempts from the following IPs:
10.10.3.16
10.10.3.23
212.178.24.26
217.24.94.83
These attempts are overloading the server to the point that it cannot respond to traffic. Which of the following attacks is occurring?
A. DDoS
B. XSS
C. Xmas
D. DoS
Answer: A
Explanation:
A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer.
One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable.
Such attacks usually lead to a server overload.
A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems
(for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. The major advantages to an attacker of using a distributed denial-of-service attack are that multiple machines can generate more attack traffic than one machine, multiple attack machines are harder to turn off than one attack machine, and that the behavior of each attack machine can be stealthier, making it harder to track and shut down. These attacker advantages cause challenges for defense mechanisms. For example, merely purchasing more incoming bandwidth than the current volume of the attack might not help, because the attacker might be able to simply add more attack machines. This after all will end up completely crashing a website for periods of time.
Malware can carry DDoS attack mechanisms; one of the better-known examples of this was MyDoom. Its DoS mechanism was triggered on a specific date and time. This type of DDoS involved hardcoding the target IP address prior to release of the malware and no further interaction was necessary to launch the attack.
Incorrect Answers:
A. Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users.
Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user.
This is not what is described in the question.
C. The question states that the source of the traffic is multiple IP addresses. Therefore, this is a DDoS (Distributed
Denial of Service) attack. A DoS (Denial of Service) attack comes from a single IP address.
D. Some stateless firewalls only check against security policy those packets which have the SYN flag set (that is, packets that initiate connection according to the standards). Since Christmas tree scan packets do not have the SYN flag turned on, they can pass through these simple systems and reach the target host.
A large number of Christmas tree packets can also be used to conduct a DoS attack by exploiting the fact that
Christmas tree packets require much more processing by routers and end-hosts than the 'usual' packets do.
This is not what is described in the question.
References:
http://en.wikipedia.org/wiki/Denial-of-service_attack
http://www.answers.com/Q/What_is_an_XMAS_attack_on_a_computer
http://en.wikipedia.org/wiki/Cross-site_scripting
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