300-320 · Question #49
300-320 Question #49: Real Exam Question with Answer & Explanation
The correct answer is C: The wrong BGP authentication password is configured on router R1.. Based on the exhibit, the BGP neighbor relationship fails because router R1 is configured with an incorrect (or mismatched) MD5 authentication password for its BGP session with R2. BGP MD5 authentication requires that both peers configure the exact same password. A mismatch cause
Question
Exhibit
Options
- AAn incorrect neighbor IP address for router R2 is configured on router R1.
- BAn incorrect neighbor AS number is configured on router R1 for router R2.
- CThe wrong BGP authentication password is configured on router R1.
- DRouter R1 must configure the R2 loopback address as the neighbor IP address.
Explanation
Based on the exhibit, the BGP neighbor relationship fails because router R1 is configured with an incorrect (or mismatched) MD5 authentication password for its BGP session with R2. BGP MD5 authentication requires that both peers configure the exact same password. A mismatch causes the TCP session underlying BGP to be rejected, preventing the neighbor relationship from reaching the Established state. The other options are ruled out: the neighbor IP and AS number appear correct in the exhibit, and using a loopback address is only required for multi-hop eBGP or specific iBGP designs, not for directly connected peers.
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