计算机网络英文题库(共15页).doc

精选优质文档-倾情为你奉上Chapter 5 The Link Layer and Local Area Network1A ( ) protocol is used to move a datagram over an individual link.Aapplication-layerBtransport-layerCnetwork-layerDlink-layer2The units of data exchanged by a link-layer protocol are called ( ).AdatagramsBframesCsegments Dmessages3Which of the following protocols is not a link-layer protocol? ( )AEthernetBPPPCHDLCDIP4In the following four descriptions, which