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Which command enable OSPF authentication?
A. IP OSPF authentication message-digest
B. network 192.168.10.0 0.0.0.255 area 0
C. area 20 authentication message-digest
D. IP OSPF message-digest-key 1 md5 CCNA
Correct Answer: A
Explanation/Reference:
This question might be incomplete. Both ip ospf authentication message-digest and area 20 authentication message-digest command enable OSPF authentication through MD5. Use the ip ospf authentication-key interface command to specify this password. If you enable MD5 authentication with the message-digest keyword, you must configure a password with the ip ospf message- digest-key interface command. interface GigabitEthernet0/1 ip address 192.168.10.1 255.255.255.0 ip ospf authentication message-digest ip ospf message-digest-key 1 md5 CCNA
Cisco Official Certification Guide, Implement Routing Update Authentication on OSPF, p.348 To enable authentication for an OSPF area, use the area authentication command in router configuration mode.
To remove an authentication specification of an area or a specified area from the configuration, use the no form of this command. area area-id authentication [message-digest] no area area-id authentication [message-digest]
http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfospf.html https://supportforums.cisco.com/document/22961/ospfauthentication
Which command enables authentication at the OSPFv2 routing process level?
area 0 authentication message-digest
area 0 authentication ipsec spi 500 md5 1 234567890ABCDEF1234567890ABCDEF
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 C1sc0!
Answer: A
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Which command do you enter to enable authentication for OSPF on an interface?
router(config-if)#ip ospf message-digest-key 1 md5 CISCOPASS
router(config-router)#area 0 authentication message-digest
router(config-router)#ip ospf authentication-key CISCOPASS
router(config-if)#ip ospf authentication message-digest
Answer: A
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The question is incomplete. It should be “Which command enables ospf authentication on an interface?”
A. ip ospf authentication message-digest
reading the explanation I hope and believe the question is incomplete, because both answer “AC” are correct. A-as a intf cmd and C-as in router configuration mode. Both are equally correct.