Topic101 problems· 6 reviewed

Network Services And Operations

101 incident problems about Network Services And Operations. Start with the reviewed ones.

All problems (101)

NETWORK-114The multicast rendezvous point is reachable, but SSM clients failCore multicast signaling looks healthy, yet receivers never join the intended streams because the edge protocol expectation differs.NetworkAdvanced18 minPro NETWORK-318A multicast RP pair is configured while one group range is filtered from MSDP state propagation and failover never restores those streams during a failover rehearsalRedundancy exists and one class of streams never inherits it. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkAdvanced19 minPro NETWORK-140Both HSRP routers relay DHCP, and clients intermittently receive duplicate offersGateway redundancy is healthy, but an adjacent service now answers twice because both paths forward the same broadcast.NetworkIntermediate15 minPro NETWORK-150A DNS resolver cluster answers internally, but the monitoring probe queries over TCP only and a firewall change now blocks fallback responses for large recordsMost lookups seem fine until oversized replies require a protocol path the probe no longer reaches.NetworkIntermediate16 minPro NETWORK-363A resolver answers from cache while one DNS64 or split-horizon view changed only on the authoritative path and new clients fail immediately during a staged decommissionWarm clients look healthy, cold clients prove the design drifted. The service still works through the primary path, but one dependency only fails when the old component is finally drained away.NetworkIntermediate16 minPro NETWORK-120IPv4 default routing is stable, but RA guard blocks new IPv6 gateway updates and dual-stack clients degrade graduallyConnectivity seems mostly fine until IPv6 freshness matters, because the edge no longer permits router advertisements from the intended gateway.NetworkIntermediate16 minPro NETWORK-112NTP stratum looks valid but symmetric peer mode creates a timing loop across the switch stackEvery device claims a trustworthy source, yet the stack drifts because peers are feeding each other instead of a real upstream reference.NetworkIntermediate16 minPro NETWORK-145The DHCP server is reachable, but Option 82 formatting changed during a switch replacement and the server now classifies the circuit incorrectlyAddress assignment survives at layer 3, yet edge identity metadata no longer matches the server's policy rules.NetworkIntermediate16 minPro NETWORK-300A DNS resolver cluster still answers while one firewall update blocks only the TCP fallback path for large DNSSEC-signed replies during a failover rehearsalMost lookups work and the larger signed ones expose the hidden protocol gap. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkIntermediate17 minPro NETWORK-186A relay path reaches the DHCP server while circuit identity metadata no longer matches the edge that sends it during a failover rehearsalThe server is up and the server-side policy no longer classifies the circuit the way the access layer expects. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkIntermediate17 minPro NETWORK-216Small DNS lookups work while large-response TCP fallback is still blocked during a failover rehearsalResolution seems mostly healthy until response size changes the protocol path. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkIntermediate17 minPro NETWORK-483A resolver answers from cache (DNS Resolution Failure)A resolver answers from cache (DNS Resolution Failure) focuses on Network Services And Operations and asks the reader to isolate DNS Resolution Failure. 실무에서는 dns-resolution-failure 이슈를 볼 때 DNS, 라우팅, ACL/방화벽, 목적지 응답을 계층별로 잘라서 확인하면 장애 구간을 훨씬 빠르게 좁힐 수 있습니다.NetworkIntermediate18 minPro NETWORK-480A resolver answers from cache (DNS Resolution Failure)A resolver answers from cache (DNS Resolution Failure) focuses on Network Services And Operations and asks the reader to isolate DNS Resolution Failure. 실무에서는 dns-resolution-failure 이슈를 볼 때 DNS, 라우팅, ACL/방화벽, 목적지 응답을 계층별로 잘라서 확인하면 장애 구간을 훨씬 빠르게 좁힐 수 있습니다.NetworkIntermediate19 minPro NETWORK-542A resolver answers from cache (DNS Resolution Failure)A resolver answers from cache (DNS Resolution Failure) focuses on Network Services And Operations and asks the reader to isolate DNS Resolution Failure. 실무에서는 dns-resolution-failure 이슈를 볼 때 DNS, 라우팅, ACL/방화벽, 목적지 응답을 계층별로 잘라서 확인하면 장애 구간을 훨씬 빠르게 좁힐 수 있습니다.NetworkIntermediate20 minPro NETWORK-599A resolver answers from cache (DNS Resolution Failure)A resolver answers from cache (DNS Resolution Failure) focuses on Network Services And Operations and asks the reader to isolate DNS Resolution Failure. 실무에서는 dns-resolution-failure 이슈를 볼 때 DNS, 라우팅, ACL/방화벽, 목적지 응답을 계층별로 잘라서 확인하면 장애 구간을 훨씬 빠르게 좁힐 수 있습니다.NetworkIntermediate20 minPro NETWORK-1720A QoS handoff stays reachable and voice still degradesVoice still degrades after a QoS handoff update.NetworkIntermediate11 minPro NETWORK-1730A QoS policy is deployed and voice still degradesVoice still degrades after a QoS policy rollout.NetworkIntermediate11 minPro NETWORK-1740A QoS policy is deployed and voice still degradesVoice still degrades after a QoS rollout.NetworkIntermediate11 minPro NETWORK-1750A QoS policy is deployed and voice still degradesVoice still degrades after a QoS rollout.NetworkIntermediate11 minPro NETWORK-1770A QoS policy is deployed and voice still degradesVoice still degrades after a QoS rollout.NetworkIntermediate11 minPro