题目内容

The units of data exchanged by a link-layer protocol are called ( ).

A. datagrams
B. frames
C. segments
D. messages

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Which of the following protocols is not a link-layer protocol? ( )

A. Ethernet
B. PPP
C. HDLC
D. IP

In Link Layer Services of Ethernet, Error Correction is:

A. Cyclic Redundancy Check
B. Internet checksum
C. Read after Write
D. NONE

Which of the following services can not offered by a link-layer protocol? ( )

A. congestion control
B. Link Access
C. Error control
D. Framing

( ) protocol serves to coordinate the frame transmissions of the many nodes when multiple nodes share a single broadcast link.

ARP
B. MAC Multiple Access Control
C. ICMP
DNS