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.
Question 491 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. After applying the correction, which verification evidence most directly demonstrates that this issue is resolved? Inspect IPv6 BGP packet hits and neighbor health in the correct CoPP class. Under controlled load, verify SSH availability and stable CPU with other classes still dropping excess packets. Send safe SSH connection attempts and verify the intended class's counters increment. Inspect CoPP class drop counters correlated with BGP session resets under controlled load. ExplanationCorrect Answer C:Send safe SSH connection attempts and verify the intended class's counters increment. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. Other Answers A:Inspect IPv6 BGP packet hits and neighbor health in the correct CoPP class. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. B:Under controlled load, verify SSH availability and stable CPU with other classes still dropping excess packets. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. D:Inspect CoPP class drop counters correlated with BGP session resets under controlled load. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope.
Question 492 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 lasting design or operational safeguard best prevents this particular issue from recurring? Build parallel IPv4/IPv6 CoPP coverage tests for dual-stack routing. Capacity-plan SNMP burst behavior in control-plane policing templates. Separate data-plane QoS objectives from device control-plane protection requirements. Audit control-plane service-policy attachments after template pushes. ExplanationCorrect Answer D:Audit control-plane service-policy attachments after template pushes. This addresses the recurring cause: Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. A targeted acceptance check is: Send safe SSH connection attempts and verify the intended class's counters increment. Other Answers A:Build parallel IPv4/IPv6 CoPP coverage tests for dual-stack routing. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. B:Capacity-plan SNMP burst behavior in control-plane policing templates. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. C:Separate data-plane QoS objectives from device control-plane protection requirements. Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope.
Question 493 A transit high-volume data stream is being shaped with CoPP, but the packets are hardware forwarded and never punted to the device CPU. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Move data-plane rate controls to the appropriate interface QoS mechanism instead of treating CoPP as transit QoS. Separate critical routing protocols into correctly classified control-plane classes with justified policing rates. Tune the specific SSH class and preserve protective limits on unrelated routing and default traffic. Adjust the appropriate management CoPP class or rate rather than widening the interface ACL. ExplanationCorrect Answer A:Move data-plane rate controls to the appropriate interface QoS mechanism instead of treating CoPP as transit QoS. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. Compare CPU-punted control traffic counters with interface QoS counters for the transit stream. Other Answers B:Separate critical routing protocols into correctly classified control-plane classes with justified policing rates. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. C:Tune the specific SSH class and preserve protective limits on unrelated routing and default traffic. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. D:Adjust the appropriate management CoPP class or rate rather than widening the interface ACL. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding.
Question 494 A transit high-volume data stream is being shaped with CoPP, but the packets are hardware forwarded and never punted to the device CPU. Which technical mechanism best explains the behavior observed in this scenario? A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. 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. ExplanationCorrect Answer B:CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. This explains why the initial condition produces the observed failure. The direct repair is: Move data-plane rate controls to the appropriate interface QoS mechanism instead of treating CoPP as transit QoS. Validate through: Compare CPU-punted control traffic counters with interface QoS counters for the transit stream. Other Answers A:A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. C: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. D:Defined class-maps and policy-maps do not police traffic until attached at the correct control-plane scope. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding.
Question 495 A transit high-volume data stream is being shaped with CoPP, but the packets are hardware forwarded and never punted to the device CPU. 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. Send safe SSH connection attempts and verify the intended class's counters increment. Compare CPU-punted control traffic counters with interface QoS counters for the transit stream. Verify SSH-class counters and a successful authenticated session at representative load. ExplanationCorrect Answer C:Compare CPU-punted control traffic counters with interface QoS counters for the transit stream. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. Other Answers A:Under controlled load, verify SSH availability and stable CPU with other classes still dropping excess packets. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. B:Send safe SSH connection attempts and verify the intended class's counters increment. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. D:Verify SSH-class counters and a successful authenticated session at representative load. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding.
Question 496 A transit high-volume data stream is being shaped with CoPP, but the packets are hardware forwarded and never punted to the device CPU. Which lasting design or operational safeguard best prevents this particular issue from recurring? Audit control-plane service-policy attachments after template pushes. Capacity-plan SNMP burst behavior in control-plane policing templates. Include management-plane traffic in CoPP stress tests and change reviews. Separate data-plane QoS objectives from device control-plane protection requirements. ExplanationCorrect Answer D:Separate data-plane QoS objectives from device control-plane protection requirements. This addresses the recurring cause: CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. A targeted acceptance check is: Compare CPU-punted control traffic counters with interface QoS counters for the transit stream. Other Answers A:Audit control-plane service-policy attachments after template pushes. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. B:Capacity-plan SNMP burst behavior in control-plane policing templates. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding. C:Include management-plane traffic in CoPP stress tests and change reviews. CoPP governs traffic destined or punted to the router control plane, not ordinary hardware-switched forwarding.
Question 497 An engineer raises every CoPP policing rate to stop dropped SSH packets, and routing control-plane CPU saturates during a flood. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Tune the specific SSH class and preserve protective limits on unrelated routing and default traffic. Add or adjust the SNMP management-plane classifier and rate for actual polling volume. Add correct IPv6 control-plane classification and rates for the intended BGP peers. Disable CoPP globally so every incoming management and routing packet can reach the CPU. ExplanationCorrect Answer A:Tune the specific SSH class and preserve protective limits on unrelated routing and default traffic. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. Under controlled load, verify SSH availability and stable CPU with other classes still dropping excess packets. Other Answers B:Add or adjust the SNMP management-plane classifier and rate for actual polling volume. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. C:Add correct IPv6 control-plane classification and rates for the intended BGP peers. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. D:Disabling CoPP may admit SSH packets but removes CPU protection and can worsen a control-plane flood. The appropriate fix retains protection while correcting the specific SSH class and rates.
Question 498 An engineer raises every CoPP policing rate to stop dropped SSH packets, and routing control-plane CPU saturates during a flood. Which technical mechanism best explains the behavior observed in this scenario? A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. 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. ExplanationCorrect Answer B:Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. This explains why the initial condition produces the observed failure. The direct repair is: Tune the specific SSH class and preserve protective limits on unrelated routing and default traffic. Validate through: Under controlled load, verify SSH availability and stable CPU with other classes still dropping excess packets. Other Answers A:A CoPP class not matching SNMP can force it into default policing even when transport reachability and credentials are valid. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. C:OSPF uses its own IP protocol number rather than a TCP/UDP application port. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. D:IPv4-only classifier syntax may not cover IPv6 packets even when the application protocol is the same. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error.
Question 499 An engineer raises every CoPP policing rate to stop dropped SSH packets, and routing control-plane CPU saturates during a flood. After applying the correction, which verification evidence most directly demonstrates that this issue is resolved? 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. Under controlled load, verify SSH availability and stable CPU with other classes still dropping excess packets. Show OSPF hits in the intended CoPP class and stable neighbor state under a safe test. ExplanationCorrect Answer C:Under controlled load, verify SSH availability and stable CPU with other classes still dropping excess packets. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. Other Answers A:Compare SNMP class hits/drops with polling results while leaving SSH and routing classes unchanged. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. B:Inspect CoPP class drop counters correlated with BGP session resets under controlled load. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. D:Show OSPF hits in the intended CoPP class and stable neighbor state under a safe test. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error.
Question 500 An engineer raises every CoPP policing rate to stop dropped SSH packets, and routing control-plane CPU saturates during a flood. Which lasting design or operational safeguard best prevents this particular issue from recurring? Review actual control-plane encapsulations before writing class-map ACLs. Include management-plane traffic in CoPP stress tests and change reviews. Capacity-plan SNMP burst behavior in control-plane policing templates. Apply class-specific change limits and control-plane capacity acceptance tests. ExplanationCorrect Answer D:Apply class-specific change limits and control-plane capacity acceptance tests. This addresses the recurring cause: Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. A targeted acceptance check is: Under controlled load, verify SSH availability and stable CPU with other classes still dropping excess packets. Other Answers A:Review actual control-plane encapsulations before writing class-map ACLs. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. B:Include management-plane traffic in CoPP stress tests and change reviews. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error. C:Capacity-plan SNMP burst behavior in control-plane policing templates. Unrestricted broad CoPP rate increases can remove protection of the router CPU while masking a classifier error.
