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64题： 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，每个子网终端最多50台电脑，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（ ）。
A.255.255.255.128
B.255.255.252.0
C.255.255.248.0
D.255.255.255.224
答案解析与讨论：www.cnitpm.com/st/1308225547.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