●以太网中采用了二进制指数后退算法,这个算法的特点是(62) 。
(62)
●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)
●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)
●在域名系统中,根域下面是顶级域(TLD)。在下面的选项中(68)属于全世界通用的顶级
域。
(68)
●为了确定一个网络是否可以连通,主机应该发送 ICMP (67)报文。
(67)
●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)
●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)
●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)
●以太网中采用了二进制指数后退算法,这个算法的特点是(62) 。
(62)
●以太网帧格式如下图所示,其中“填充”字段的作用是(63) 。
(63)
●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)
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