May 2024
Intermediate to advanced
309 pages
13h 33m
English
Content preview from Data Communications and Computer Networks by Pearson
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Flow and Error Control 141
validated, then the system sends an authenticate-nakpacket indicating that access is denied. When-
ever a PAP packet is being carried in a PPP frame, the protocol field of PPP frame is set to a value
0xC023 (hexadecimal).
Challenge Handshake Authentication Protocol
This is a three-way handshaking authentication protocol. It uses four packets, namely, challenge,
response, success and failure. The system sends a challengepacket containing a challenge value to the
user needing access to the system. The user retrieves the challenge value from the challenge packet and
inputs this value along with its password ...
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