Which of the following protocols does not operate at the data link layer (layer 2)?
A.
PPP
B.
RARP
C.
L2F
D.
ICMP
Explanation:
ICMP works at the network layer of the OSI model.
Incorrect Answers:
A: RARP is a data link layer protocol.
B: L2F is a data link layer protocol.
C: ICMP is a data link layer protocol.https://en.wikipedia.org/wiki/Network_layer