第61题： IEEE802.11采用了CSMA/CA协议，采用这个协议的原因是（ ）。
A.这个协议比CSMA/CD更安全
B.这种协议可以开放更多业务
C.这种协议可能解决隐蔽站的问题
D.这个协议比其它协议更有效率
答案解析与讨论：www.cnitpm.com/st/1307912861.html

第62题： 配置路由器默认路由的命令是（ ）。
A.iproute220.117.15.0255.255.255.00.0.0.0
B.iproute220.117.15.0255.255.255.0220.117.15.1
C.iproute0.0.0.0255.255.255.0220.117.15.1
D.iproute0.0.0.00.0.0.0220.117.15.
答案解析与讨论：www.cnitpm.com/st/130804178.html

第63题： 路由表如下图所示，如果一个分组的目标地址是220.117.5.65，则会发送给那个端口？

（ ）。

A.220.117.1.2
B.220.117.2.2
C.220.117.3.3
D.220117.4.4
答案解析与讨论：www.cnitpm.com/st/1308113724.html

第65题： 网络系统设计过程中，物理网络设计阶段的任务是（ ）。
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
答案解析与讨论：www.cnitpm.com/st/1308323231.html

第66题： Traditional IP packet forwarding analyzes the （ 1）IP address contained in then network layee header of each packet as the 　packet rravels from its sourse to its final destination. A router analyzes the destination IP address independently at each hop in the network. Dynamic （ 2） protocols or staitic 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 its （ 4）.New techniques are therefore required to address and expand the functionality of an IP-based network infrastructure. This first chapter concertrates on idenfifying these restrictions.and presents a new architecture,known as multiprotocol（ 5）switching,that provides solutions to some of this restrictions.

( 1).A.datagram
B.destination
C.connection
D.service
( 2).A.routing
B.forwarding
C.transmission
D.managerment
( 3).A.anycast
B.multicast
C.broadcast
D.unicast
( 4).A.reliability
B.flexibility
C.stability
D.capability
( 5).A.cost
B.cast
C.mark
D.label

答案解析与讨论：www.cnitpm.com/st/1308411314.html