● Traditional IP packet forwarding analyzes the __(1)__IP address contained in the network layer header of each packet as the packet travels from its source to its final destination. A router analyzes the destination IP address independently at each hop in the network. Dynamic __(2)__protocols or static configuration builds the database needed to analyze the destination IP address （the routing table）.The process of implementing traditional IP routing also is called hop-by-hop destination-based __(3)__routing. Although successful，and obviously widely deployed，certain restrictions，which have been realized for some time，exist for this method of packet forwarding that diminish is __(4)__. New techniques are therefore required to address and expand the functionality of an IP-based network infrastructure.This first chapter concentrates on identifying these restrictions and presents a new archiecture，known as multiprotocol __(5)__switching，that provides solutions some of these restrictions。

（1）A．datagram

B．destination

C．connection

D．service

（2）A．routing 

B．forwarding 

C．transmission

D．management

（3）A．anycast 

B．muticast 

C．broadcast 

D．unicast

（4）A．reliability

B．flexibility 

C．stability 

D．capability

（5）A．cost

B．cast 

C．mark

D．label

●网络系统设计过程中，物理网络设计阶段的任务是__(6)__。 

（6）A．依据逻辑网络设计的要求，确定设备的具体物理分布和运行环境

B．分析现有网络和新网络的各类资源分布，掌握网络所处的状态

C．根据需求规范和通信规范，实施资源分配和安全规划

D．理解网络应该具有的功能和性能，最终设计出符合用户需求的网络

● 一家连锁店需要设计一种编址方案来支持全国各个门店销售网络，门店有300家左右，每个门店一个子网，每个子网中的终端最多50台，该连锁店从ISP处得到一个B类地址，应该采用的子网掩码是__(7)__。

（7）A．255.255.255.128

B．255.255.252.0

C．255.255.248.0

D．255.255.255.224

● 路由表如下图所示，如果一个分组的目标地址是220.117.5.65，则会被发送给哪个端口 ？__(8)__ 

（8）A．220.117.1.2

B．220.117.2.2

C．220.117.3.3

D．220.117.4.4

●配置路由器默认路由的命令是__(9)__。 

（9）A．ip route  220.117.15.0  255.255.255.0  0 0.0.0.0

B．ip route  220.117.15.0  255.255.255.0  220.117.15.1

C．ip route  0.0.0.0  255.255.255.0  220.117.15.1

D．ip route  0.0.0.0  0.0.0.0 220.117.15.1

● IEEE802.11采用了 CSMA/CA协议，采用这个协议的原因是__(10)__。

（10）A．这个协议比CSMA/CD更安全

B．这种协议可以引进更多业务

C．这种协议可以解决隐蔽终端问题

D．这个协议比其他协议更有效率