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N10-009 Domain 5: Network Troubleshooting

BGP session down after firewall change. Likely?

Multiple choice — select one answer

Answer choices

  1. a. TCP 179 blocked between peers
  2. b. Replace patch cable and inspect SFP/transceiver
  3. c. Mis-scoped DHCP or relay pointing to old server
  4. d. ICMP/time-exceeded filtered — not always outage

Architectural breakdown & explanation

BGP uses TCP port 179 between routers.

Correct answer(s): a. TCP 179 blocked between peers

Exam domain: Domain 5: Network Troubleshooting (22% weight on the official guide).

Official documentation & study links

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