●Border Gateway Protocol(BGP) is inter-autonomous system (71) protocol. BGP is based on a routing method called path vector routing. Distance vector routing is not a good candidate for inter-autonomous system routing because there are occasions on which the route with the smallest (72) count is not the preferred route. For example, we may not want a packet through an not secure even though it is the shortest route. Also, distance vector routing is unstable due to the fact that the routers announce only the number of hop counts to the destination without actually defining the path that leads to that (73) ．A router that recevives a distance vector advertisement packet may be fooled if the shortest path is actually calculated through the receiving router itself. Link (74) routing is also not a good candidate for inter-autonomous system routing because an Internet is usually too big for this routing method. To use link state routing for the whole internet would require each routex to have a huge link state database. It would also take a long time for each router to calculate its rousting (75) using the Dijkstra algorism.

（71）

●Border Gateway Protocol(BGP) is inter-autonomous system (71) protocol. BGP is based on a routing method called path vector routing. Distance vector routing is not a good candidate for inter-autonomous system routing because there are occasions on which the route with the smallest (72) count is not the preferred route. For example, we may not want a packet through an not secure even though it is the shortest route. Also, distance vector routing is unstable due to the fact that the routers announce only the number of hop counts to the destination without actually defining the path that leads to that (73) ．A router that recevives a distance vector advertisement packet may be fooled if the shortest path is actually calculated through the receiving router itself. Link (74) routing is also not a good candidate for inter-autonomous system routing because an Internet is usually too big for this routing method. To use link state routing for the whole internet would require each routex to have a huge link state database. It would also take a long time for each router to calculate its rousting (75) using the Dijkstra algorism.

（71）

●根据用户需求选择正确的网络技术是保证网络建立成功的关键， 在选择网络技术时应考虑多种因素。下面各种考虑中，不正确的是（70） 。

(70）

●Wi-Fi联盟制定的安全认证方案 WPA(Wi-fi Protected Access)是（66）标准的子集。

(66）

●在网络设计阶段进行通信流量分析时可以采用简单的 80/20 规则，下面关于这种规则的说

明中，正确的是（69） 。

(69）

●IEEE 802.11标准中使用了扩频通信技术，下面选项中有关于扩频协议通信的说法中正确

的是（65） 。

(65）

●IEEE 802.11 采用了 CSMA/CA 下面关于这个协议的描述中错误的是（64） 。

 (64）

●按照802.1d 生成树协议(STP)，在交换机互连的局域网中， （61）的交换机被选为根交换

机。

 (61)

●以太网帧格式如下图所示，其中“填充”字段的作用是（63） 。

(63）

●如果要设置交换机的 IP地址，则命令提示符应该是（58） 。

(58)

●路由器命，"Router(config-subif)# encapsulation dotlq 1”作用是（59） 。

（59）