Certification793 problems· 22 reviewed

CCNA

793 incident response problems that help with CCNA prep.

All problems (793)

NETWORK-1442A BGP failback never happensPrimary links recover and traffic stays on the backup path until manual intervention.NetworkAdvanced14 minPro NETWORK-1391A CDN hostname serves HTTP/2 cleanly and API uploads fail over HTTP/3Uploads fail only for clients that negotiate HTTP/3 while ordinary browsing and HTTP/2 API calls remain healthy.NetworkAdvanced14 minPro NETWORK-1355A Cisco OSPF adjacency stays two-wayA routing policy cleanup introduces passive-interface default and later one neighbor remains stuck in two-way despite matching hello parameters.NetworkAdvanced14 minPro NETWORK-1343A Cloudflare cache purge succeeds for URLs and stale content remainsA caching optimization rollout works initially and later targeted purges stop removing stale content even though the API accepts every request.NetworkAdvanced14 minPro NETWORK-1361A Cloudflare proxied hostname returns intermittent 526A proxied site looks healthy and later only some requests return 526 when traffic lands on a specific origin server.NetworkAdvanced14 minPro NETWORK-1403A dual-WAN firewall syncs NAT state to its peer and failover still breaks...A dual-WAN firewall syncs NAT state to its peer and failover still breaks... focuses on nat and asks the reader to isolate the key signal in netgate. Session sync can preserve state and still lose the route-selection context needed to cont...NetworkAdvanced14 minPro NETWORK-1423A firewall HA failover preserves sessions and still breaks voice qualityA firewall HA failover preserves sessions and still breaks voice quality focuses on nat and asks the reader to isolate the key signal in netgate. State sync can preserve connectivity while still losing the policy context that drives QoS treatment.NetworkAdvanced14 minPro NETWORK-1433A firewall HA pair preserves sessions and still ruins voice qualityA firewall HA pair preserves sessions and still ruins voice quality focuses on nat and asks the reader to isolate the key signal in netgate. Session continuity does not guarantee policy continuity when HA sync omits classification context.NetworkAdvanced14 minPro NETWORK-1413A firewall HA pair syncs sessions and one branch still loses VoIP on failoverA firewall HA pair syncs sessions and one branch still loses VoIP on failover focuses on nat and asks the reader to isolate the key signal in netgate. HA state sync can preserve connection tuples without preserving the policy context needed for QoS...NetworkAdvanced14 minPro NETWORK-1363A Palo Alto decryption exception fixes browsers and mobile clients still failA decryption bypass is created for an app and later only mobile or modern clients keep failing while browsers recover.NetworkAdvanced14 minPro NETWORK-1353A Palo Alto URL category exception fixes browsers and the API still failsA decryption policy is tuned for an app and later only mobile or modern clients keep failing while browsers work.NetworkAdvanced14 minPro NETWORK-1389A Palo Alto URL filtering change looks correct and one SaaS app fails only on...A Palo Alto URL filtering change looks correct and one SaaS app fails only... focuses on incident-response and asks the reader to isolate the key signal in Palo Alto Networks. Multi-host SaaS apps often break on the one upload or media hostname...NetworkAdvanced14 minPro NETWORK-1369A pfSense HA pair syncs cleanly and one package VPN remains brokenAn HA firewall upgrade looks successful and later one package-managed VPN fails only after failover to the secondary node.NetworkAdvanced14 minPro NETWORK-1359A pfSense HA sync reports success and one package VPN never returns on the...A pfSense HA sync reports success and one package VPN never returns on the... focuses on Identity And Access and asks the reader to isolate the key signal in netgate. HA success on the base firewall does not guarantee package-owned...NetworkAdvanced14 minPro NETWORK-1381A QUIC-enabled edge works for browsers and the enterprise proxy breaks API...A QUIC-enabled edge works for browsers and the enterprise proxy breaks API... focuses on incident-response and asks the reader to isolate the key signal in NGINX. Protocol negotiation bugs can hide in header mutation behavior that differs...NetworkAdvanced14 minPro NETWORK-1427A recovery VLAN works on one MLAG peer and not the otherA recovery VLAN works on one MLAG peer and not the other focuses on l2-switching and asks the reader to isolate the key signal in Arista. Operational recovery workflows can diverge from steady-state configuration symmetry in MLAG...NetworkAdvanced14 minPro NETWORK-1437A recovery VLAN works on one MLAG peer and not the otherA recovery VLAN works on one MLAG peer and not the other focuses on l2-switching and asks the reader to isolate the key signal in Arista. Redundancy bugs can hide in differences between recovery procedures rather than in the steady...NetworkAdvanced14 minPro NETWORK-1447A recovery VLAN works on one MLAG peer and not the otherHosts on orphan ports recover after one failure mode and stay isolated after another.NetworkAdvanced14 minPro NETWORK-1417A recovery VLAN works on one side of an MLAG pair and not the otherA recovery VLAN works on one side of an MLAG pair and not the other focuses on l2-switching and asks the reader to isolate the key signal in Arista. Redundancy bugs can hide in operational boot-path differences even when the running co...NetworkAdvanced14 minPro NETWORK-1385A recursive resolver forwards correctly and DNSSEC validation fails only for...A recursive resolver forwards correctly and DNSSEC validation fails only... focuses on reverse-proxy-security and asks the reader to isolate the key signal in Linux. Suffix exceptions can accidentally route one domain around the trust guaran...NetworkAdvanced14 minPro