Question 480 A CoPP ACL classifies OSPF packets using only TCP or UDP ports, so OSPF control packets are never matched. Which lasting design or operational safeguard best prevents this particular issue from recurring? Separate data-plane QoS objectives from device control-plane protection requirements. Build parallel IPv4/IPv6 CoPP coverage tests for dual-stack routing. Include management-plane traffic in CoPP stress tests and change reviews. Review actual control-plane encapsulations before writing class-map ACLs. ExplanationCorrect Answer D:Review actual control-plane encapsulations before writing class-map ACLs. This addresses the recurring cause: OSPF uses its own IP protocol number rather than a TCP/UDP application port. A targeted acceptance check is: Show OSPF hits in the intended CoPP class and stable neighbor state under a safe test. Other Answers A:Separate data-plane QoS objectives from device control-plane protection requirements. OSPF uses its own IP protocol number rather than a TCP/UDP application port. B:Build parallel IPv4/IPv6 CoPP coverage tests for dual-stack routing. OSPF uses its own IP protocol number rather than a TCP/UDP application port. C:Include management-plane traffic in CoPP stress tests and change reviews. OSPF uses its own IP protocol number rather than a TCP/UDP application port.
Question 481 A security policy classifies only IPv4 BGP traffic for CoPP while IPv6 BGP sessions to the device are affected by a generic default class. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Add correct IPv6 control-plane classification and rates for the intended BGP peers. Separate critical routing protocols into correctly classified control-plane classes with justified policing rates. Check that the service-policy is actually applied in the supported control-plane direction. Add or adjust the SNMP management-plane classifier and rate for actual polling volume. ExplanationCorrect Answer A:Add correct IPv6 control-plane classification and rates for the intended BGP peers. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. Inspect IPv6 BGP packet hits and neighbor health in the correct CoPP class. Other Answers B:Separate critical routing protocols into correctly classified control-plane classes with justified policing rates. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. C:Check that the service-policy is actually applied in the supported control-plane direction. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. D:Add or adjust the SNMP management-plane classifier and rate for actual polling volume. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same.
Question 482 A security policy classifies only IPv4 BGP traffic for CoPP while IPv6 BGP sessions to the device are affected by a generic default class. Which technical mechanism best explains the behavior observed in this scenario? OSPF uses its own IP protocol number rather than a TCP/UDP application port. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. CoPP can limit packets punted to the CPU; an overbroad class can starve essential routing control traffic. Control-plane policing can discard packets destined for the router after interface forwarding/ACL decisions permit them. ExplanationCorrect Answer B:IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. This explains why the initial condition produces the observed failure. The direct repair is: Add correct IPv6 control-plane classification and rates for the intended BGP peers. Validate through: Inspect IPv6 BGP packet hits and neighbor health in the correct CoPP class. Other Answers A:OSPF uses its own IP protocol number rather than a TCP/UDP application port. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. C:CoPP can limit packets punted to the CPU; an overbroad class can starve essential routing control traffic. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. D:Control-plane policing can discard packets destined for the router after interface forwarding/ACL decisions permit them. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same.
Question 483 A security policy classifies only IPv4 BGP traffic for CoPP while IPv6 BGP sessions to the device are affected by a generic default class. After applying the correction, which verification evidence most directly demonstrates that this issue is resolved? Inspect CoPP class drop counters correlated with BGP session resets under controlled load. Verify SSH-class counters and a successful authenticated session at representative load. Inspect IPv6 BGP packet hits and neighbor health in the correct CoPP class. Compare SNMP class hits/drops with polling results while leaving SSH and routing classes unchanged. ExplanationCorrect Answer C:Inspect IPv6 BGP packet hits and neighbor health in the correct CoPP class. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. Other Answers A:Inspect CoPP class drop counters correlated with BGP session resets under controlled load. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. B:Verify SSH-class counters and a successful authenticated session at representative load. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. D:Compare SNMP class hits/drops with polling results while leaving SSH and routing classes unchanged. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same.
Question 484 A security policy classifies only IPv4 BGP traffic for CoPP while IPv6 BGP sessions to the device are affected by a generic default class. Which lasting design or operational safeguard best prevents this particular issue from recurring? Capacity-plan SNMP burst behavior in control-plane policing templates. Audit control-plane service-policy attachments after template pushes. Apply class-specific change limits and control-plane capacity acceptance tests. Build parallel IPv4/IPv6 CoPP coverage tests for dual-stack routing. ExplanationCorrect Answer D:Build parallel IPv4/IPv6 CoPP coverage tests for dual-stack routing. This addresses the recurring cause: IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. A targeted acceptance check is: Inspect IPv6 BGP packet hits and neighbor health in the correct CoPP class. Other Answers A:Capacity-plan SNMP burst behavior in control-plane policing templates. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. B:Audit control-plane service-policy attachments after template pushes. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. C:Apply class-specific change limits and control-plane capacity acceptance tests. IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same.
Question 485 SNMP polling times out after CoPP deployment while direct SSH is healthy; UDP polling packets hit a low-rate default class. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Add or adjust the SNMP management-plane classifier and rate for actual polling volume. Check that the service-policy is actually applied in the supported control-plane direction. Match OSPF's actual IP protocol type and validate the applied class-map and policy-map. Adjust the appropriate management CoPP class or rate rather than widening the interface ACL. ExplanationCorrect Answer A:Add or adjust the SNMP management-plane classifier and rate for actual polling volume. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. Compare SNMP class hits/drops with polling results while leaving SSH and routing classes unchanged. Other Answers B:Check that the service-policy is actually applied in the supported control-plane direction. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. C:Match OSPF's actual IP protocol type and validate the applied class-map and policy-map. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. D:Adjust the appropriate management CoPP class or rate rather than widening the interface ACL. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid.
Question 486 SNMP polling times out after CoPP deployment while direct SSH is healthy; UDP polling packets hit a low-rate default class. Which technical mechanism best explains the behavior observed in this scenario? Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. OSPF uses its own IP protocol number rather than a TCP/UDP application port. CoPP can limit packets punted to the CPU; an overbroad class can starve essential routing control traffic. ExplanationCorrect Answer B:A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. This explains why the initial condition produces the observed failure. The direct repair is: Add or adjust the SNMP management-plane classifier and rate for actual polling volume. Validate through: Compare SNMP class hits/drops with polling results while leaving SSH and routing classes unchanged. Other Answers A:Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. C:OSPF uses its own IP protocol number rather than a TCP/UDP application port. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. D:CoPP can limit packets punted to the CPU; an overbroad class can starve essential routing control traffic. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid.
Question 487 SNMP polling times out after CoPP deployment while direct SSH is healthy; UDP polling packets hit a low-rate default class. After applying the correction, which verification evidence most directly demonstrates that this issue is resolved? Under controlled load, verify SSH availability and stable CPU with other classes still dropping excess packets. Inspect IPv6 BGP packet hits and neighbor health in the correct CoPP class. Compare SNMP class hits/drops with polling results while leaving SSH and routing classes unchanged. Inspect CoPP class drop counters correlated with BGP session resets under controlled load. ExplanationCorrect Answer C:Compare SNMP class hits/drops with polling results while leaving SSH and routing classes unchanged. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. Other Answers A:Under controlled load, verify SSH availability and stable CPU with other classes still dropping excess packets. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. B:Inspect IPv6 BGP packet hits and neighbor health in the correct CoPP class. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. D:Inspect CoPP class drop counters correlated with BGP session resets under controlled load. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid.
Question 488 SNMP polling times out after CoPP deployment while direct SSH is healthy; UDP polling packets hit a low-rate default class. Which lasting design or operational safeguard best prevents this particular issue from recurring? Audit control-plane service-policy attachments after template pushes. Review actual control-plane encapsulations before writing class-map ACLs. Build parallel IPv4/IPv6 CoPP coverage tests for dual-stack routing. Capacity-plan SNMP burst behavior in control-plane policing templates. ExplanationCorrect Answer D:Capacity-plan SNMP burst behavior in control-plane policing templates. This addresses the recurring cause: A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. A targeted acceptance check is: Compare SNMP class hits/drops with polling results while leaving SSH and routing classes unchanged. Other Answers A:Audit control-plane service-policy attachments after template pushes. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. B:Review actual control-plane encapsulations before writing class-map ACLs. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. C:Build parallel IPv4/IPv6 CoPP coverage tests for dual-stack routing. A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid.
Question 489 CoPP policy-map counters remain zero although a class was created for SSH, and the engineer assumes the absence of attack traffic proves it works. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Check that the service-policy is actually applied in the supported control-plane direction. Adjust the appropriate management CoPP class or rate rather than widening the interface ACL. Tune the specific SSH class and preserve protective limits on unrelated routing and default traffic. Add correct IPv6 control-plane classification and rates for the intended BGP peers. ExplanationCorrect Answer A:Check that the service-policy is actually applied in the supported control-plane direction. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. Send safe SSH connection attempts and verify the intended class's counters increment. Other Answers B:Adjust the appropriate management CoPP class or rate rather than widening the interface ACL. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. C:Tune the specific SSH class and preserve protective limits on unrelated routing and default traffic. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. D:Add correct IPv6 control-plane classification and rates for the intended BGP peers. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope.
Question 490 CoPP policy-map counters remain zero although a class was created for SSH, and the engineer assumes the absence of attack traffic proves it works. Which technical mechanism best explains the behavior observed in this scenario? OSPF uses its own IP protocol number rather than a TCP/UDP application port. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. CoPP can limit packets punted to the CPU; an overbroad class can starve essential routing control traffic. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. ExplanationCorrect Answer B:Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. This explains why the initial condition produces the observed failure. The direct repair is: Check that the service-policy is actually applied in the supported control-plane direction. Validate through: Send safe SSH connection attempts and verify the intended class's counters increment. Other Answers A:OSPF uses its own IP protocol number rather than a TCP/UDP application port. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. C:CoPP can limit packets punted to the CPU; an overbroad class can starve essential routing control traffic. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. D:CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope.
