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CompTIA N10-009 Practice Test 57

Question 560

A network specialist investigates this evidence: A public service becomes unavailable under distributed volumetric traffic saturating the ISP link. Which underlying condition BEST explains the observed failure or requirement?

  1. An intermediary may be intercepting or redirecting encrypted sessions.
  2. Attack traffic overwhelms MAC-learning capacity.
  3. Malware can move laterally through broadly trusted internal protocols.
  4. Incoming traffic volume exceeds upstream link capacity.

Explanation

Correct Answer

D:

Incoming traffic volume exceeds upstream link capacity. Local firewalls cannot restore capacity already exhausted upstream.

Incorrect Answers

A:

An intermediary may be intercepting or redirecting encrypted sessions. That does not establish incoming traffic volume exceeds upstream link capacity.

B:

Limits on MAC learning reduce deliberate table exhaustion. That does not establish incoming traffic volume exceeds upstream link capacity.

C:

Malware can move laterally through broadly trusted internal protocols. That does not establish incoming traffic volume exceeds upstream link capacity.

Question 561

A network team observes: A public Wi-Fi client receives a captive warning with a certificate for the wrong destination when visiting internal email. What is the MOST appropriate corrective action or technical decision?

  1. Reject invalid server identity and use authenticated encrypted sessions.
  2. Enable DHCP snooping with trusted server-facing ports and reject untrusted offers.
  3. Engage provider-side DDoS filtering or scrubbing before the saturated link.
  4. Enable supported dynamic ARP inspection and valid binding checks on access switches.

Explanation

Correct Answer

A:

Encryption without server authentication cannot prevent impostor interception. An intermediary may be intercepting or redirecting encrypted sessions.

Incorrect Answers

B:

Enabling DHCP snooping with trusted server-facing ports and rejecting untrusted offers would not reject invalid server identity and use authenticated encrypted sessions.

C:

Engage provider-side DDoS filtering or scrubbing would not reject invalid server identity and use authenticated encrypted sessions. Encryption without server authentication cannot prevent impostor interception.

D:

Enabling supported dynamic ARP inspection and valid binding checks on access switches would not reject invalid server identity and use authenticated encrypted sessions.

Question 562

A network team addresses this situation: A public Wi-Fi client receives a captive warning with a certificate for the wrong destination when visiting internal email. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Connect a controlled rogue DHCP server to an untrusted port and inspect dropped offers.
  2. Attempt a mismatched certificate and confirm browser blocks the connection.
  3. Run an authorized traffic simulation and measure preserved legitimate throughput.
  4. Inject a controlled forged ARP reply and verify its rejection.

Explanation

Correct Answer

B:

Attempt a mismatched certificate and confirm browser blocks the connection.

Incorrect Answers

A:

DHCP assigns client network parameters through a supported lease exchange. That check cannot demonstrate attempt a mismatched certificate and confirm browser blocks the connection.

C:

Run an authorized traffic simulation and measure preserved legitimate throughput. That check cannot demonstrate attempt a mismatched certificate and confirm browser blocks the connection.

D:

A forwarded frame uses the local next-hop MAC even when its encapsulated IP destination stays constant. That check cannot demonstrate attempt a mismatched certificate and confirm browser blocks the connection.

Question 563

A network specialist investigates this evidence: A public Wi-Fi client receives a captive warning with a certificate for the wrong destination when visiting internal email. Which underlying condition BEST explains the observed failure or requirement?

  1. A rogue DHCP server is answering leases on the LAN.
  2. Incoming traffic volume exceeds upstream link capacity.
  3. An intermediary may be intercepting or redirecting encrypted sessions.
  4. An attacker is sending forged ARP mappings for the default gateway.

Explanation

Correct Answer

C:

An intermediary may be intercepting or redirecting encrypted sessions. Encryption without server authentication cannot prevent impostor interception.

Incorrect Answers

A:

DHCP assigns client network parameters through a supported lease exchange. That does not establish an intermediary may be intercepting or redirecting encrypted sessions.

B:

Incoming traffic volume exceeds upstream link capacity. That does not establish an intermediary may be intercepting or redirecting encrypted sessions.

D:

A forwarded frame uses the local next-hop MAC even when its encapsulated IP destination stays constant. That does not establish an intermediary may be intercepting or redirecting encrypted sessions.

Question 564

A network team observes: A user enters network admin credentials into a realistic fake support page emailed by an attacker. What is the MOST appropriate corrective action or technical decision?

  1. Harden recursive resolver validation and use DNSSEC where supported.
  2. Use staffed or electronic single-person access with visitor escort procedures.
  3. Use certificate-validated enterprise authentication and monitor for rogue APs.
  4. Use resistant MFA with reporting and rapid revocation of compromised credentials.

Explanation

Correct Answer

D:

Phishing resilience requires identity controls plus response. Credential-harvesting social engineering bypasses user suspicion.

Incorrect Answers

A:

Harden recursive resolver validation and use DNSSEC where supported would not meet the need for multifactor authentication. Phishing resilience requires identity controls plus response.

B:

Using staffed or electronic single-person access with visitor escort procedures would not meet the need for multifactor authentication. Phishing resilience requires identity controls plus response.

C:

Using certificate-validated enterprise authentication and monitoring for rogue APs would not meet the need for multifactor authentication. Phishing resilience requires identity controls plus response.

Question 565

A network team addresses this situation: A user enters network admin credentials into a realistic fake support page emailed by an attacker. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Revoke a test factor and attempt the captured password on the real VPN.
  2. Observe a supervised access attempt without a valid badge.
  3. Submit an invalid signed DNS response and verify resolver rejects it.
  4. Attempt association to an AP with an untrusted RADIUS certificate and observe refusal.

Explanation

Correct Answer

A:

Revoke a test factor and attempt the captured password on the real VPN.

Incorrect Answers

B:

Observe a supervised access attempt without a valid badge. That check cannot demonstrate revoke a test factor and attempt the captured password on the real VPN.

C:

DNS resolution maps hostnames to records and can fail independently of packet forwarding. That check cannot demonstrate revoke a test factor and attempt the captured password on the real VPN.

D:

Attempt association to an AP with an untrusted RADIUS certificate and observe refusal. That check cannot demonstrate revoke a test factor and attempt the captured password on the real VPN.

Question 566

A network specialist investigates this evidence: A user enters network admin credentials into a realistic fake support page emailed by an attacker. Which underlying condition BEST explains the observed failure or requirement?

  1. An intermediary resolver has accepted forged DNS content.
  2. Credential-harvesting social engineering bypasses user suspicion.
  3. Anti-tailgating policy lacks an enforceable entry control.
  4. A counterfeit wireless access point impersonates the SSID.

Explanation

Correct Answer

B:

Credential-harvesting social engineering bypasses user suspicion. Phishing resilience requires identity controls plus response.

Incorrect Answers

A:

DNS resolution maps hostnames to records and can fail independently of packet forwarding. That does not establish credential-harvesting social engineering bypasses user suspicion.

C:

Anti-tailgating policy lacks an enforceable entry control. That does not establish credential-harvesting social engineering bypasses user suspicion.

D:

A counterfeit wireless access point impersonates the SSID. That does not establish credential-harvesting social engineering bypasses user suspicion.

Question 567

A network team observes: One infected workstation scans file shares and attempts remote service logins across an unrestricted office LAN. What is the MOST appropriate corrective action or technical decision?

  1. Enable supported dynamic ARP inspection and valid binding checks on access switches.
  2. Reject invalid server identity and use authenticated encrypted sessions.
  3. Segment endpoints and restrict administrative protocols to authorized jump paths.
  4. Use resistant MFA with reporting and rapid revocation of compromised credentials.

Explanation

Correct Answer

C:

Malware can move laterally through broadly trusted internal protocols.

Incorrect Answers

A:

Enabling supported dynamic ARP inspection and valid binding checks on access switches would not address the need for segment endpoints and restrict administrative protocols to authorized jump paths.

B:

Rejecting invalid server identity and using authenticated encrypted sessions would not address the need for segment endpoints and restrict administrative protocols to authorized jump paths.

D:

Malware can move laterally through broadly trusted internal protocols. The needed intervention is segment endpoints and restrict administrative protocols to authorized jump paths.

Question 568

A network team addresses this situation: One infected workstation scans file shares and attempts remote service logins across an unrestricted office LAN. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Inject a controlled forged ARP reply and verify its rejection.
  2. Generate controlled source-MAC changes and inspect violation counters.
  3. Submit an invalid signed DNS response and verify resolver rejects it.
  4. Simulate unauthorized SMB and RDP connection attempts across zones.

Explanation

Correct Answer

D:

SMB and NFS present shared files through file-level permissions rather than raw block devices. Verification of this result involves simulate unauthorized SMB and RDP connection attempts across zones.

Incorrect Answers

A:

A forwarded frame uses the local next-hop MAC even when its encapsulated IP destination stays constant. That check cannot demonstrate file-level service access for the required clients.

B:

Generate controlled source-MAC changes and inspect violation counters. That check cannot demonstrate file-level service access for the required clients.

C:

DNS resolution maps hostnames to records and can fail independently of packet forwarding. That check cannot demonstrate file-level service access for the required clients.

Question 569

A network specialist investigates this evidence: One infected workstation scans file shares and attempts remote service logins across an unrestricted office LAN. Which underlying condition BEST explains the observed failure or requirement?

  1. Malware can move laterally through broadly trusted internal protocols.
  2. An attacker is sending forged ARP mappings for the default gateway.
  3. Incoming traffic volume exceeds upstream link capacity.
  4. Attack traffic overwhelms MAC-learning capacity.

Explanation

Correct Answer

A:

Malware can move laterally through broadly trusted internal protocols. Lateral controls limit compromised host reachability.

Incorrect Answers

B:

A forwarded frame uses the local next-hop MAC even when its encapsulated IP destination stays constant. That does not establish malware can move laterally through broadly trusted internal protocols.

C:

Incoming traffic volume exceeds upstream link capacity. That does not establish malware can move laterally through broadly trusted internal protocols.

D:

Limits on MAC learning reduce deliberate table exhaustion. That does not establish malware can move laterally through broadly trusted internal protocols.

Question 570

A network team observes: A person without a badge enters the network operations room by following an authorized employee. What is the MOST appropriate corrective action or technical decision?

  1. Use resistant MFA with reporting and rapid revocation of compromised credentials.
  2. Use staffed or electronic single-person access with visitor escort procedures.
  3. Use certificate-validated enterprise authentication and monitor for rogue APs.
  4. Engage provider-side DDoS filtering or scrubbing before the saturated link.

Explanation

Correct Answer

B:

Physical access checks must bind every entrant to authorization. Anti-tailgating policy lacks an enforceable entry control.

Incorrect Answers

A:

Anti-tailgating policy lacks an enforceable entry control.

C:

Using certificate-validated enterprise authentication and monitoring for rogue APs would not meet the need for staffed or electronic single-person access with visitor escort procedures.

D:

Engage provider-side DDoS filtering or scrubbing would not meet the need for staffed or electronic single-person access with visitor escort procedures.


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