计算机网络-第4章 4.2-虚电路和数据报网络-同步电大进度

小鱼儿 2023-01-15 05:55 163阅读 0赞

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下面有关虚电路分组交换和数据报分组交换的特性，（ ）是正确的。

*  A.虚电路方式和数据报方式都为无连接的服务
 *  B.数据报方式中，分组在网络中沿同一条路径传输，并且按发出顺序到达
 *  **C.虚电路在建立连接之后，分组中只需要携带VC标识符**
 *  D.虚电路中的分组到达顺序可能与发出顺序不同

### 数据报网络的应用场景 ###

**数据报网络有很多优点，试讨论一下数据报网络的应用。**

1传输效率 网络上传送的报文,在很多情况下其长度都很短。用数据报既迅速又经济。但若用虚电路,为了传送一个分组而建立虚电路和释放虚电路就显得太浪费网络资源了。

2.路由选择 在使用数据报时,每个分组必须携带完整的地址信息。而在使用虚电路的情况下,每个分组不需要携带完整的目的地址,而仅需要有个很简单的虚电路号码的标志。这就使分组的...

3.处理的复杂性 (1)在使用数据报时,主机承担端到端的差错控制和流量控制。

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