The Internet is based on a connectionless end-to-end packet service, which traditionally provided best-effort means of data （ ）using the Transmission Control Protocol/Internet Protocol Suite. Although the （ ）design gives the Internet its flexibility and robustness, its packet dynamics also make it prone to congestion problems,especially at （ ）that connect networks of widely different bandwidths.The initial QoS function set was for internet hosts.One major problem with expensive wide-area（ ）links is the excessive overhead due to small Transmission Control Protocol packets created by applications such as telnet and rlogin. The Nagle （ ），which solves this issue,is now supported by all IP host implementations. A.transformationB.transportationC.processingD.progressingA.connectionlessB.connectionC.connection-orientedD.connotationA.hostsB.switchesC.routersD.computersA.interconnectionB.networkC.internetD.webA.technologyB.problemC.structureD.algorithm