300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

By Cisco · Question Mode

QuestionQ515

Layer 3 Technologies

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Refer to the exhibit. The neighbor relationship is not establishing.

Which two configurations bring up the adjacency?

Choose two
  • A LA interface E 0/0 ip ospf authentication-key Cisco123
  • B NY interface E 0/0 no ip ospf message-digest-key 1 md5 Cisco123 ip ospf authentication-key Cisco123
  • C LA interface E 0/0 ip ospf message-digest-key 1 md5 Cisco123
  • D LA router ospf 1 area 0 authentication message-digest
  • E NY router ospf 1 area 0 authentication message-digest
Explanation

OSPF neighbors must use the same authentication type and matching authentication credentials. NY Ethernet 0/0 already uses message-digest authentication with MD5 key ID 1 and key Cisco123. Configuring LA with the same message-digest key and enabling MD5 authentication for LA Area 0 makes both sides use matching MD5 authentication, allowing the adjacency to form. Cisco documents that area 0 authentication message-digest enables MD5 for the area and requires an interface ip ospf message-digest-key configuration.

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