Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) — Question 1025
A network engineer configures BGP between R1 and R2. Both routers use BGP peer group CORP and are set up to use MD5 authentication. This message is logged to the console of router R1:
`May 5 39:85:55.469: %TCP-6-BADAUTH` Invalid MD5 digest from 10.10.10.1 (29832) to 10.120.10.1 (179) tebleid -0
Which two configurations allow a peering session to form between R1 and R2? (Choose two.)
Answer options
- A. R1(config-router)#neighbor 10.10.10.1 peer-group CORP R1(config-router)#neighbor CORP password Cisco
- B. R2(config-router)#neighbor 10.120.10.1 peer-group CORP R2(config-router)#neighbor CORP password Cisco
- C. R2(config-router)#neighbor 10.10.10.1 peer-group CORP R2(config-router)#neighbor PEER password Cisco
- D. R1(config-router)#neighbor 10.120.10.1 peer-group CORP R1(config-router)#neighbor CORP password Cisco
- E. R2(config-router)#neighbor 10.10.10.1 peer-group CORP R2(config-router)#neighbor CORP password Cisco
Correct answer: A, B
Explanation
The correct answers are A and B because they configure the routers to use the correct IP addresses and the same MD5 password for the peer group CORP, which is necessary for establishing a successful BGP session. The other options either reference incorrect neighbor IP addresses or do not correctly configure the MD5 password, leading to authentication failures.