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Exam Code: CISSP
Exam Name: Certified Information Systems Security Professional
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Certified Information Systems Security Professional CISSP Practice Test 29

Question 280

A voice system carries sensitive calls over a shared office data network. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Encrypt call setup messages only while voice media traverses the shared LAN in cleartext
  2. Treat desk-phone physical location as sufficient proof that sensitive calls need no network controls
  3. Separate voice devices into a VLAN but leave call signaling and audio streams unprotected
  4. Separate voice trust boundaries and protect signaling and media appropriately

Explanation

Correct Answer

D:

Voice traffic needs confidentiality, integrity and availability considerations. A direct way to confirm the outcome is to capture call signaling and media and check protected treatment.

Incorrect Answers

A:

Voice traffic needs confidentiality, integrity and availability considerations. “Encrypt call setup messages only while voice media traverses the shared LAN in cleartext” does not supply that control; “Separate voice trust boundaries and protect signaling and media appropriately” addresses the identified gap, and “Capture call signaling and media and check protected treatment” verifies the result.

B:

The security distinction is that voice traffic needs confidentiality, integrity and availability considerations. “Treat desk-phone physical location as sufficient proof that sensitive calls need no network controls” addresses neither the required “Separate voice trust boundaries and protect signaling and media appropriately” action nor its supporting evidence: “Capture call signaling and media and check protected treatment”.

C:

Voice traffic needs confidentiality, integrity and availability considerations. “Separate voice devices into a VLAN but leave call signaling and audio streams unprotected” does not supply that control; “Separate voice trust boundaries and protect signaling and media appropriately” addresses the identified gap, and “Capture call signaling and media and check protected treatment” verifies the result.

Question 281

A voice system carries sensitive calls over a shared office data network. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Capture call signaling and media and check protected treatment
  2. Verify the PBX web console uses HTTPS but not the security of active call media
  3. Confirm the phone registers successfully without examining signaling or RTP media protection
  4. Review the voice VLAN tag alone while calls can still be heard from shared traffic

Explanation

Correct Answer

A:

Voice traffic needs confidentiality, integrity and availability considerations. The result of the remedy is checked directly: Capture call signaling and media and check protected treatment.

Incorrect Answers

B:

“Verify the PBX web console uses HTTPS but not the security of active call media” evaluates something other than the specified fix. The meaningful evidence is “Capture call signaling and media and check protected treatment”, reflecting the requirement that voice traffic needs confidentiality, integrity and availability considerations.

C:

“Confirm the phone registers successfully without examining signaling or RTP media protection” is insufficient to demonstrate that “Separate voice trust boundaries and protect signaling and media appropriately” works. Voice traffic needs confidentiality, integrity and availability considerations. The decisive test is “Capture call signaling and media and check protected treatment”.

D:

“Review the voice VLAN tag alone while calls can still be heard from shared traffic” evaluates something other than the specified fix. The meaningful evidence is “Capture call signaling and media and check protected treatment”, reflecting the requirement that voice traffic needs confidentiality, integrity and availability considerations.

Question 282

A network team assumes VLAN membership prevents all lateral movement. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Add more VLANs but leave inter-VLAN routes broadly open to unrelated workloads
  2. Apply identity-aware microsegmentation and restrict east-west service flows
  3. Install endpoint antivirus while allowing east-west access to every application port
  4. Rely on private addressing and assume compromised internal hosts cannot move laterally

Explanation

Correct Answer

B:

VLANs create logical grouping but are not full workload authorization. A direct way to confirm the outcome is to test compromised host reachability to unrelated workload segments.

Incorrect Answers

A:

“Add more VLANs but leave inter-VLAN routes broadly open to unrelated workloads” would not establish the protection described: vLANs create logical grouping but are not full workload authorization. The necessary change is “Apply identity-aware microsegmentation and restrict east-west service flows” with the verification “Test compromised host reachability to unrelated workload segments”.

C:

“Install endpoint antivirus while allowing east-west access to every application port” would not establish the protection described: vLANs create logical grouping but are not full workload authorization. The necessary change is “Apply identity-aware microsegmentation and restrict east-west service flows” with the verification “Test compromised host reachability to unrelated workload segments”.

D:

“Rely on private addressing and assume compromised internal hosts cannot move laterally” leaves the essential control missing: vLANs create logical grouping but are not full workload authorization. The direct corrective action is “Apply identity-aware microsegmentation and restrict east-west service flows”, validated by the acceptance check “Test compromised host reachability to unrelated workload segments”.

Question 283

A network team assumes VLAN membership prevents all lateral movement. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Confirm approved users can connect to their apps without exercising prohibited east-west flows
  2. Review Internet firewall logs while lateral paths remain unfiltered inside the data center
  3. Test compromised host reachability to unrelated workload segments
  4. Verify switch VLAN assignments but never test reachability to another workload zone

Explanation

Correct Answer

C:

VLANs create logical grouping but are not full workload authorization. The result of the remedy is checked directly: Test compromised host reachability to unrelated workload segments.

Incorrect Answers

A:

The acceptance test must demonstrate “Test compromised host reachability to unrelated workload segments” because vLANs create logical grouping but are not full workload authorization. “Confirm approved users can connect to their apps without exercising prohibited east-west flows” cannot establish that result.

B:

An observation of “Review Internet firewall logs while lateral paths remain unfiltered inside the data center” would not verify the relevant control. VLANs create logical grouping but are not full workload authorization. The necessary acceptance evidence is “Test compromised host reachability to unrelated workload segments”.

D:

An observation of “Verify switch VLAN assignments but never test reachability to another workload zone” would not verify the relevant control. VLANs create logical grouping but are not full workload authorization. The necessary acceptance evidence is “Test compromised host reachability to unrelated workload segments”.

Question 284

A design assumes IPv6 hosts can be protected exclusively through IPv4 firewall rules. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Block inbound IPv4 scans while leaving globally routable IPv6 interfaces exposed
  2. Enable IPv4 ACLs on dual-stack hosts and assume identical IPv6 rules are inherited
  3. Disable logging for IPv6 neighbor discovery without securing rogue advertisements
  4. Implement native IPv6 filtering and neighbor-discovery safeguards

Explanation

Correct Answer

D:

IPv4 policies do not automatically secure IPv6 traffic. A direct way to confirm the outcome is to exercise permitted and prohibited IPv6 routes from dual-stack hosts.

Incorrect Answers

A:

“Block inbound IPv4 scans while leaving globally routable IPv6 interfaces exposed” is not the relevant mitigation. IPv4 policies do not automatically secure IPv6 traffic. The scenario calls for “Implement native IPv6 filtering and neighbor-discovery safeguards”; the acceptance check is “Exercise permitted and prohibited IPv6 routes from dual-stack hosts”.

B:

The proposal “Enable IPv4 ACLs on dual-stack hosts and assume identical IPv6 rules are inherited” does not meet the relevant requirement because iPv4 policies do not automatically secure IPv6 traffic. The matching remediation is “Implement native IPv6 filtering and neighbor-discovery safeguards”.

C:

“Disable logging for IPv6 neighbor discovery without securing rogue advertisements” is not the relevant mitigation. IPv4 policies do not automatically secure IPv6 traffic. The scenario calls for “Implement native IPv6 filtering and neighbor-discovery safeguards”; the acceptance check is “Exercise permitted and prohibited IPv6 routes from dual-stack hosts”.

Question 285

A design assumes IPv6 hosts can be protected exclusively through IPv4 firewall rules. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Exercise permitted and prohibited IPv6 routes from dual-stack hosts
  2. Test only IPv4 penetration paths and omit dual-stack traffic entirely
  3. Confirm IPv6 addresses are assigned without sending prohibited IPv6 packets through the firewall
  4. Review IPv4 firewall reports instead of testing neighbor-discovery and router-advertisement abuse

Explanation

Correct Answer

A:

IPv4 policies do not automatically secure IPv6 traffic. The result of the remedy is checked directly: Exercise permitted and prohibited IPv6 routes from dual-stack hosts.

Incorrect Answers

B:

IPv4 policies do not automatically secure IPv6 traffic. The proposed check, “Test only IPv4 penetration paths and omit dual-stack traffic entirely”, misses the relevant outcome; “Exercise permitted and prohibited IPv6 routes from dual-stack hosts” tests whether the intended remedy worked.

C:

“Confirm IPv6 addresses are assigned without sending prohibited IPv6 packets through the firewall” does not show the required outcome: exercise permitted and prohibited IPv6 routes from dual-stack hosts. That test matters because iPv4 policies do not automatically secure IPv6 traffic.

D:

IPv4 policies do not automatically secure IPv6 traffic. The proposed check, “Review IPv4 firewall reports instead of testing neighbor-discovery and router-advertisement abuse”, misses the relevant outcome; “Exercise permitted and prohibited IPv6 routes from dual-stack hosts” tests whether the intended remedy worked.

Question 286

A distributed application needs fault-resilient access from global clients. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Configure anycast advertisements but never remove a failed edge from service
  2. Use suitable anycast or resilient edge routing with health-aware backends
  3. Add more origin servers behind one unmonitored Internet ingress and ignore regional path outages
  4. Point all global clients to one static region and treat DNS caching as automatic high availability

Explanation

Correct Answer

B:

Anycast addressing and backend service health solve different availability layers. A direct way to confirm the outcome is to test ingress response from diverse networks during endpoint outage.

Incorrect Answers

A:

Anycast addressing and backend service health solve different availability layers. “Configure anycast advertisements but never remove a failed edge from service” does not supply that control; “Use suitable anycast or resilient edge routing with health-aware backends” addresses the identified gap, and “Test ingress response from diverse networks during endpoint outage” verifies the result.

C:

Anycast addressing and backend service health solve different availability layers. “Add more origin servers behind one unmonitored Internet ingress and ignore regional path outages” does not supply that control; “Use suitable anycast or resilient edge routing with health-aware backends” addresses the identified gap, and “Test ingress response from diverse networks during endpoint outage” verifies the result.

D:

The security distinction is that anycast addressing and backend service health solve different availability layers. “Point all global clients to one static region and treat DNS caching as automatic high availability” addresses neither the required “Use suitable anycast or resilient edge routing with health-aware backends” action nor its supporting evidence: “Test ingress response from diverse networks during endpoint outage”.

Question 287

A distributed application needs fault-resilient access from global clients. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Run a speed benchmark with all endpoints healthy but never exercise ingress failover
  2. Confirm requests succeed from headquarters while remote continents and edge failures remain untested
  3. Test ingress response from diverse networks during endpoint outage
  4. Inspect global route announcements without simulating an unavailable backend

Explanation

Correct Answer

C:

Anycast addressing and backend service health solve different availability layers. The result of the remedy is checked directly: Test ingress response from diverse networks during endpoint outage.

Incorrect Answers

A:

“Run a speed benchmark with all endpoints healthy but never exercise ingress failover” is insufficient to demonstrate that “Use suitable anycast or resilient edge routing with health-aware backends” works. Anycast addressing and backend service health solve different availability layers. The decisive test is “Test ingress response from diverse networks during endpoint outage”.

B:

“Confirm requests succeed from headquarters while remote continents and edge failures remain untested” evaluates something other than the specified fix. The meaningful evidence is “Test ingress response from diverse networks during endpoint outage”, reflecting the requirement that anycast addressing and backend service health solve different availability layers.

D:

“Inspect global route announcements without simulating an unavailable backend” evaluates something other than the specified fix. The meaningful evidence is “Test ingress response from diverse networks during endpoint outage”, reflecting the requirement that anycast addressing and backend service health solve different availability layers.

Question 288

A network engineer stores management traffic in the same unrestricted tenant segment. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Rely on administrators to avoid tenant networks while management ports remain publicly reachable
  2. Put management interfaces on the tenant VLAN but use a nonstandard TCP port for concealment
  3. Encrypt management sessions while allowing ordinary application hosts unrestricted access to the control plane
  4. Build an isolated management plane with controlled administrative entry

Explanation

Correct Answer

D:

Out-of-band access reduces dependence on a compromised production path. A direct way to confirm the outcome is to prove tenant hosts cannot reach management interfaces.

Incorrect Answers

A:

“Rely on administrators to avoid tenant networks while management ports remain publicly reachable” would not establish the protection described: out-of-band access reduces dependence on a compromised production path. The necessary change is “Build an isolated management plane with controlled administrative entry” with the verification “Prove tenant hosts cannot reach management interfaces”.

B:

“Put management interfaces on the tenant VLAN but use a nonstandard TCP port for concealment” leaves the essential control missing: out-of-band access reduces dependence on a compromised production path. The direct corrective action is “Build an isolated management plane with controlled administrative entry”, validated by the acceptance check “Prove tenant hosts cannot reach management interfaces”.

C:

“Encrypt management sessions while allowing ordinary application hosts unrestricted access to the control plane” would not establish the protection described: out-of-band access reduces dependence on a compromised production path. The necessary change is “Build an isolated management plane with controlled administrative entry” with the verification “Prove tenant hosts cannot reach management interfaces”.

Question 289

A network engineer stores management traffic in the same unrestricted tenant segment. After implementing a remedy, which acceptance-test evidence MOST directly demonstrates that the specific issue has been addressed?

  1. Prove tenant hosts cannot reach management interfaces
  2. Check transport encryption settings but not whether application hosts can connect to admin ports
  3. Review the management network's name while ACLs still expose devices to tenants
  4. Confirm administrators can manage the platform without attempting tenant-to-management reachability

Explanation

Correct Answer

A:

Out-of-band access reduces dependence on a compromised production path. The result of the remedy is checked directly: Prove tenant hosts cannot reach management interfaces.

Incorrect Answers

B:

An observation of “Check transport encryption settings but not whether application hosts can connect to admin ports” would not verify the relevant control. Out-of-band access reduces dependence on a compromised production path. The necessary acceptance evidence is “Prove tenant hosts cannot reach management interfaces”.

C:

The acceptance test must demonstrate “Prove tenant hosts cannot reach management interfaces” because out-of-band access reduces dependence on a compromised production path. “Review the management network's name while ACLs still expose devices to tenants” cannot establish that result.

D:

An observation of “Confirm administrators can manage the platform without attempting tenant-to-management reachability” would not verify the relevant control. Out-of-band access reduces dependence on a compromised production path. The necessary acceptance evidence is “Prove tenant hosts cannot reach management interfaces”.

Question 290

A company interconnects subsidiaries with different routing and security domains. Which security recommendation MOST directly addresses the described risk or requirement?

  1. Accept route imports from every subsidiary without prefix filtering or policy review
  2. Separate route exchange using controlled VRFs and scoped policy
  3. Exchange all subsidiary routes globally and depend on firewall rules to isolate conflicting tenants
  4. Assign different VLAN names but leak overlapping address prefixes between routing domains

Explanation

Correct Answer

B:

VRF separation is about routing tables, not merely port tagging. A direct way to confirm the outcome is to review route-leak tests and allowed cross-domain prefixes.

Incorrect Answers

A:

“Accept route imports from every subsidiary without prefix filtering or policy review” is not the relevant mitigation. VRF separation is about routing tables, not merely port tagging. The scenario calls for “Separate route exchange using controlled VRFs and scoped policy”; the acceptance check is “Review route-leak tests and allowed cross-domain prefixes”.

C:

“Exchange all subsidiary routes globally and depend on firewall rules to isolate conflicting tenants” is not the relevant mitigation. VRF separation is about routing tables, not merely port tagging. The scenario calls for “Separate route exchange using controlled VRFs and scoped policy”; the acceptance check is “Review route-leak tests and allowed cross-domain prefixes”.

D:

The proposal “Assign different VLAN names but leak overlapping address prefixes between routing domains” does not meet the relevant requirement because VRF separation is about routing tables, not merely port tagging. The matching remediation is “Separate route exchange using controlled VRFs and scoped policy”.

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