How does RIPv2 authenticate routing peers?
What will be an ideal response?
RIP authentication can occur either by passing the authentication keys in clear text or via MD5 authentication. RFC 1321 defines MD5 as an "algorithm [that] takes as input a message of arbitrary length and produces as output a 128-bit ‘fingerprint' or ‘message digest' of the input." In short, using MD5 allows RIPv2 to authenticate a routing peer without sending the secret key (a text string) across the link between the two peers. Instead, it runs the MD5 algorithm against the secret key and sends the hash to the peer. A hash is a number generated by MD5 from the secret key. This number cannot be reverse-engineered easily enough for someone to guess the secret key. The hash is sent to the opposite peer, which runs MD5 against its configured secret key; if the two hashes match, then the two peers are considered authenticated.
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