正确答案:
题目:共享介质以太网所采用的介质访问控制方法是()。
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学习资料的答案和解析:
[单选题]IP头和TCP头的最小开销合计为(21)字节,以太网最大帧长为1518字节,则可以传送的TCP数据最大为(22)字节。
C.40
解析:TCP包头20字节,IP包头20字节;以太网帧最多包含1500字节,去除20字节IP包头,20字节TCP包头,剩余TCP中数据部分1460字节
[单选题]The de facto standard Application Program Interface (API) for TCP/IP applications is the “sockets” interface. Although this API was developed for (71) in the early 1960s it has also been implemented on a wide variety of no-Unix systems. TCP/IP (72) Written using the sockets API have in the past enjoyed a high degree of portability and we would like the same (73) with IPv6 applications. But changes are required to the sockets API to support IPv6 and this memo describes these changes. These include a new socket address structure to carry IPv6 (74) ,new address conversion functions, and some new socket options. These extensions are designed to provide access to the basic IPv6 features requited by TCP and UDP applications, including multicasting, while introducing a minimums of change into the system and providing complete (75) for existing IPv4 applications.
C.Unix
[单选题]在下列任务中,哪些是网络操作系统的基本任务?()①屏蔽本地资源与网络资源之间的差异②为用户提供基本的网络服务功能③管理网络系统的共享资源④提供网络系统的安全服务
①②③④
[单选题]如果子网172.6.32.0/20再划分为172.6.32.0/26,则下面的结论中正确的是()。
每个子网有62台主机
[单选题]网络系统设计过程中,逻辑网络设计阶段的任务是()。
理解网络应该具有的功能和性能,设计出符合用户需求的网络
[单选题]在广播网络中,OSPF要选定一个指定路由器(DR),指定路由器的功能是()。
向其他路由器发送最新路由表