The Internet is based on connectionless end-to-end packet service, which traditionally provided best-effort means of data （ ）using the Transmission Control Protocol/Internet Protocol Suite. Although the （请作答此空）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.
Aconnectionless
Bconnection
Cconnection-oriented
Dconnotation
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