CCNA
793 incident response problems that help with CCNA prep.
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All problems (793)
NETWORK-025HTTP keepalive pool sends requests to drained backendHTTP keepalive pool sends requests to drained backend is a hands-on troubleshooting drill. A backend has been removed from the balancer, but idle pooled connections continue sending requests there for a while. DNS and Routing needs to be checked by narrowing scope, recent chan...NetworkIntermediate20 minProNETWORK-647A VLAN handoff trunks correctly (Auth and Session Failure)A VLAN handoff trunks correctly (Auth and Session Failure) focuses on Switching And Vlan Design and asks the reader to isolate Auth and Session Failure in Cisco. 실무에서는 auth-and-session-failure 이슈를 볼 때 DNS, 라우팅, ACL/방화벽, 목적지 응답을 계층별로 잘라서 확인하면 장애 구간을 훨씬 빠르게 좁힐 수 있습니다.NetworkIntermediate21 minProNETWORK-015After adding a WAF rule, only certain JSON requests return 403Reproduces and analyzes a situation where most requests are fine but only a specific payload pattern is caught by the security rule.NetworkIntermediate21 minProNETWORK-012After an Anycast DNS switch, only a certain region keeps getting the old IPA situation where the global switch is done but cache and regional resolver differences send only some users to the old endpoint.NetworkIntermediate23 minProNETWORK-1630A multicast boundary is right and one flow still failsOne multicast flow still fails after a boundary update.NetworkIntermediate10 minProNETWORK-1620An EVPN route import is correct and one MAC still lands on the wrong leafOne MAC still lands on the wrong leaf after an EVPN move.NetworkIntermediate10 minProNETWORK-1720A QoS handoff stays reachable and voice still degradesVoice still degrades after a QoS handoff update.NetworkIntermediate11 minProNETWORK-1730A QoS policy is deployed and voice still degradesVoice still degrades after a QoS policy rollout.NetworkIntermediate11 minProNETWORK-1740A QoS policy is deployed and voice still degradesVoice still degrades after a QoS rollout.NetworkIntermediate11 minProNETWORK-1750A QoS policy is deployed and voice still degradesVoice still degrades after a QoS rollout.NetworkIntermediate11 minProNETWORK-1770A QoS policy is deployed and voice still degradesVoice still degrades after a QoS rollout.NetworkIntermediate11 minProNETWORK-1790A QoS policy is deployed and voice still degradesVoice still degrades after the QoS policy rollout.NetworkIntermediate11 minProNETWORK-1830A QoS policy is deployed and voice still degradesVoice still degrades after the QoS policy rollout.NetworkIntermediate11 minProNETWORK-1710A QoS policy is deployed and voice traffic still degradesVoice traffic still degrades after a QoS policy rollout.NetworkIntermediate11 minProNETWORK-1760A QoS rollout is complete and voice still degradesVoice still degrades after the QoS rollout completed.NetworkIntermediate11 minProNETWORK-1780A QoS rollout is complete and voice still degradesVoice still degrades after the QoS rollout completed.NetworkIntermediate11 minProNETWORK-1800A QoS rollout is complete and voice still degradesVoice still degrades after the QoS rollout completed.NetworkIntermediate11 minProNETWORK-1840A QoS rollout is complete and voice still degradesVoice still degrades after the QoS rollout completed.NetworkIntermediate11 minProNETWORK-1850A QoS rollout is complete and voice still degradesVoice still degrades after the QoS rollout completed.NetworkIntermediate11 minProNETWORK-1860A QoS rollout is complete and voice still degradesVoice still degrades after the QoS rollout completed.NetworkIntermediate11 minPro