搜题请搜索小程序“爱下问搜题”
问题 单项选择题

当电报报文中需要编发”ZCZC”或”NNNN”时，正确的是（）。

A.无限制

B.不可以编发

C.编发为”Z—C—Z—C”或”N—N—N—N”

D.编发为“ZCZC”或“NNNN”

答案

参考答案：C

单项选择题

因为购物车具有良好的（），所以能支持以后推出的新的网上业务。

A.适应性

B.扩展性

C.兼容性

D.标（E）准化
查看答案
单项选择题

The network layer provides services to the transport layer. It can be based on either___20___. In both cases, its main job is ___21___ packets from the source to the destination.

In network layer, subnets can easily become congested, ncreasing the delay and ___22___ for packets. Network designers attempt to avoid congestion by proper design. Techniques include___23___ policy, caching, flow control, and more.

The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service. The methods that can be used for this include buffering at the client, traffic shaping, resource___24___, and admission control. Approaches that have been designed for good quality of service include integrated services (including RSVP), differentiated services, and MPLS.

24（）

A．distribution

B．guarantee

C．scheme

D．reservation
查看答案