Refer to the exhibit.
Which of the following options is correct?
A.
OSPF peers are using Type 1 authentication.
B.
OSPF peers are using Type 2 authentication.
C.
Authentication is used, but there is a password mismatch.
D.
The OSPF peer IP address is 172.16.10.36.
Explanation:
This document shows sample configurations for Open Shortest Path First (OSPF) authentication
which allows the flexibility to authenticate OSPF neighbors. You can enable authentication in
OSPF in order to exchange routing update information in a secure manner. OSPF authentication
can either be none (or null), simple, or MD5. The authentication method “none” means that no
authentication is used for OSPF and it is the default method. With simple authentication, the
password goes in clear-text over the network. With MD5 authentication, the password does not
pass over the network. MD5 is a message-digest algorithm specified in RFC 1321. MD5 is
considered the most secure OSPF authentication mode. When you configure authentication, you
must configure an entire area with the same type of authentication. Starting with Cisco
IOS® Software Release 12.0(8), authentication is supported on a per-interface basis. This is also
mentioned in RFC 2328, Appendix D. This feature is added in Cisco bug ID CSCdk33792
(registered customers only).
These are the three different types of authentication supported by OSPF.
Null Authentication—This is also called Type 0 and it means no authentication information is
included in the packet header. It is the default.
Plain Text Authentication—This is also called Type 1 and it uses simple clear-text passwords.MD5 Authentication—This is also called Type 2 and it uses MD5 cryptographic passwords
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