What WAN Protocol has no error recovery, relying on higher-level protocols to provide reliability?
A.
ATM
B.
Frame Relay
C.
SMDS
D.
X.25
Explanation:
Answer B is correct; Frame Relay is a packet switched Layer 2 WAN protocol that features no error recovery.Incorrect Answers and Explanations: A, C, and D: Answers A, C, and D are incorrect. ATM and SMDS are cell-based WAN protocols that provide error correction. X.25 is a packet switched protocol similar to Frame Relay, but X.25 features error recovery.
Frame Relay is a packet switched Layer 2 WAN protocol that features no error recovery.
ATM and SMDS are cell-based WAN protocols that provide error correction. X.25 is a packet switched protocol similar to Frame Relay, but X.25 features error recovery.