精选优质文档-倾情为你奉上CHAPTER 4: NETWORK LAYER1.Which of the following groups belongs to network layer protocol? _D_A.IP, TCP and UDPB.ARP, IP, and UDPC.FTP, IMAP and IPD.ICMP, BGP, and RIP2.The 3-PDU is named as _C_A.messageB.packetC.datagramD.segment3.In a dat