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Question 54 - JN0-280 discussion

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You are troubleshooting a downed BGP session.

Referring to the exhibit, what is the cause of the problem?

A.

The UDP session between the peers has not been established.

Answers
A.

The UDP session between the peers has not been established.

B.

The local peer has sent an Open message but not received one from the remote peer.

Answers
B.

The local peer has sent an Open message but not received one from the remote peer.

C.

The TCP session between the peers has not been established.

Answers
C.

The TCP session between the peers has not been established.

D.

The local peer has sent an Update message but not received one from the remote peer.

Answers
D.

The local peer has sent an Update message but not received one from the remote peer.

Suggested answer: C

Explanation:

The BGP session in the exhibit shows the state as Connect, which indicates that the TCP session between the BGP peers has not been fully established.

Step-by-Step Breakdown:

BGP State 'Connect':

The Connect state is the second stage in the BGP finite state machine (FSM). At this stage, BGP is trying to establish a TCP session with the peer, but the session has not yet been successfully established.

A successful TCP three-way handshake (SYN, SYN-ACK, ACK) is required before BGP can progress to the OpenSent state, where the peers exchange BGP Open messages.

Possible Causes:

A firewall blocking TCP port 179.

Incorrect IP addresses or network connectivity issues between the BGP peers.

Juniper

Reference:

BGP Troubleshooting: In Junos, if a BGP session is stuck in the Connect state, the issue is likely due to a failure in establishing the underlying TCP connection.

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asked 10/10/2024
jonathan siu
41 questions
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