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350-501 · Question #100

Refer to the exhibit. An engineer wants to authenticate the OSPF neighbor between PEA and PE- B using MD5. Which command on PE-B successfully completes the configuration?

The correct answer is D. PE-B(config-if)#ip ospf message-digest-key 1 md5 44578611. To successfully authenticate OSPF neighbors using MD5, both adjacent routers must have the same message-digest key ID and the exact same MD5 key configured on their connecting interfaces.

Networking

Question

Refer to the exhibit. An engineer wants to authenticate the OSPF neighbor between PEA and PE- B using MD5. Which command on PE-B successfully completes the configuration?

Exhibit

350-501 question #100 exhibit

Options

  • APE-B(config-if)#ip ospf message-digest-key 1 md5 44578611
  • BPE-B(config-if)#ip ospf message-digest-key 1 md5 44578611
  • CPE-B(config-if)#ip ospf message-digest-key 1 md5 44568611
  • DPE-B(config-if)#ip ospf message-digest-key 1 md5 44578611

How the community answered

(30 responses)
  • A
    3% (1)
  • C
    7% (2)
  • D
    90% (27)

Why each option

To successfully authenticate OSPF neighbors using MD5, both adjacent routers must have the same message-digest key ID and the exact same MD5 key configured on their connecting interfaces.

APE-B(config-if)#ip ospf message-digest-key 1 md5 44578611

This option is textually identical to the correct answer, but in a multiple-choice setting, only one option is designated correct.

BPE-B(config-if)#ip ospf message-digest-key 1 md5 44578611

This option is textually identical to the correct answer, but in a multiple-choice setting, only one option is designated correct.

CPE-B(config-if)#ip ospf message-digest-key 1 md5 44568611

This option is incorrect because the MD5 key '44568611' does not match the key '44578611' configured on PE-A, preventing successful authentication.

DPE-B(config-if)#ip ospf message-digest-key 1 md5 44578611Correct

For OSPF MD5 authentication to succeed, both adjacent routers (PE-A and PE-B) must be configured with the identical message-digest key ID (1) and the identical MD5 key (44578611) on their respective interfaces that form the OSPF adjacency. This ensures that the authentication hashes match, allowing the adjacency to form.

Concept tested: OSPF MD5 authentication configuration

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-16/iro-xe-16-book/iro-cfg-ospf-auth.html

Topics

#OSPF Authentication#MD5 Security#Routing Protocol Configuration#Service Provider Routing

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