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NSE 7 - Secure Networking 7.6 Architect Exam Materials-Question 41 Discussion
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Refer to the exhibit. The output of a BGP debug command is shown. Why has the local router at 172.16.23.58 been unable to establish adjacency with its only neighbor? (Choose one answer)

  • A. The neighbor router has become unreachable, which is evident by the low ratio of messages received to messages sent.
  • B. The local router has not received an OPEN message from the neighbor.
  • C. There is no active route to the BGP neighbor.
  • D. The local router has not received a SYN/ACK packet from the neighbor.
Correct Answer: D

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D 100%

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Md Nasir Uddin 2026-08-23 16:33:23

Selected Answers: D


BGP Finite States
Idle: Initial state; BGP waits for a start trigger and listens for incoming TCP connections.

Connect: BGP waits for the three-way TCP handshake to finish; moves to OpenSent on success.

Active: TCP connection failed; BGP tries actively to re-initiate a new outbound TCP session.

OpenSent: TCP is up, and an Open message has been sent; waiting for the peer's Open response.

OpenConfirm: Parameters accepted; waiting for a final

Keepalive message from the neighbor.

Established: Peer adjacency is fully formed; active exchange of Update and Keepalive packets occurs.