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单选题
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.
A
B
C
D
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答案：
解析：
题干中提到“The Internet is based on connectionless end-to-end packet service”，即互联网是基于无连接端到端包服务的。因此，第一个空应填入“connectionless”，表示无连接的。第二个空是对这种设计方式的描述，仍然与连接状态有关，应填“connection”。第三个空描述的是网络连接的瓶颈问题，特别是在连接不同带宽的网络时，与传输控制协议包有关，因此选择“transmission”。最后，Nagle算法是为了解决因telnet和rlogin等应用程序产生的小传输控制协议包导致的过多开销问题，因此选择A connectionless符合语境。因此，正确答案是A、B。
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