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單項選擇題

Which of the protocols below, operates at Layer 2 of the OSI model, and is used to maintain a loop-free network?（）

A.RIP
B.STP
C.IGRP
D.CDP
E.VTP

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單項選擇題

Which OSI layer is associated with the following: The acknowledgement of transmissions, sequencing, and flow control across a network?（）

A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 5
E. Layer 6
F. Layer 7

單項選擇題

In the "host to host" layer of the DOD model, which of the following is a valid connection oriented protocol?（）

A.ARP
B.RARP
C.TCP
D.UDP
E.IP
F.ICMP
G.BootP