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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 ( )design gives the Internet its flexibility and robustness, its packet dynamics also make it prone to congestion problems,especially at (请作答此空)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
hosts
B
switches
C
routers
D
computers
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答案:

C

解析:

根据句子结构和语境,空格处需要填入的是网络连接的节点设备,而根据常识和常见网络设备类型,路由器(routers)是连接不同网络的设备之一,因此选项C为正确答案。句子的意思是:互联网是基于无连接端到端的数据包服务,它传统上通过传输控制协议/互联网协议套件使用尽力而为的数据传输方式。虽然这种设计赋予了互联网灵活性和健壮性,但其数据包动态性也使得它容易受到拥塞问题的影响,特别是在连接不同带宽网络的路由器上。

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