NTP Troubleshooting Capstone

Bundle lab · $29.99

Advanced NTP capstone, run as a fault hunt. Two branch routers disagree about the time and neither will sync, despite both being configured for NTP and able to ping each other. You get symptoms and the required end state — no fault list. Faults sit on both devices, and two of them make NTP fail while the configuration reads as though it should work — including a restriction pointing at something that was never created.

Learning objectives

• Diagnose an NTP association that never reaches synchronised state, from operational state alone
• Recognise that an access-group referencing an undefined ACL denies everything rather than permitting it
• Understand why demanding authentication without a configured key stops a client trusting any server
• Distinguish a client pointed at the wrong address from a server that is refusing to serve
• Repair faults on both ends of a client/server relationship

Troubleshooting focus

• R2 shows unsynchronized status and never transitions to a valid stratum
• NTP associations indicate an unreachable or invalid server
• A time source exists on-link but is not authoritative