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Item 1. “Host A compares its IP address with Router B’s IP” should read “Host A compares its IP address with Host B’s IP”.
Review question 16 is missing option “D. Root Guard.”
The router ospf 1 command is missing from R1’s configuration:
! Enable area 0 authentication using MD5
R1(config)router ospf 1
R1(config-router)#area 0 authentication message-digest
The answer to review question 10 is “C. IKE uses UDP/500.”
The answer to review question 11 is “A. ESP uses IP protocol 50.”