题目内容
（请给出正确答案）
A.RIP使用广泛、配置简单，支持CIDR，VLSM及连续子网
B.RIP最大跳数是15跳，也就是在一条链路上不能超过15个路由器
C.RIP能够支持对链路速度的度量，并根据速度的不同来优化路由
D.RIP的路由更新时间是30秒，收敛慢，网络规模加大后性能表示不佳
参考答案
更多“下面关于RIP路由选择的描述不正确的是（）。（）A．RIP使用广泛、配置简单，支持CIDR，VLSM及连续子网B．RI”相关的问题
B、OSPF没有RIP古老
C、RIP和OSPF都是内部网关协议
D、OSPF使用了跳跃数作为路由距离，而RIP使用了最优路径
B.可以通过IP地址前缀列表对RIP路由进行过滤
C.可以通过发布网关对路由信息进行过滤
D.可以通过接口对路由信息进行过滤
A、RIP 是一种分布式的、基于距离向量的路由选择协议
B、RIP协议适用于规模较小的网络
C、仅和相邻路由器交换路由信息
D、路由器之间只交换有发生变化的路由信息
A、动态路由可以通过自身的学习，自动修改和刷新路由表
B、动态路由要求路由器之间不断地交换路由信息
C、动态路由有更多的自主性和灵活性
D、动态路由特别适合于拓扑结构简单，网络规模小型的互联网环境
TCP functions at the Open Systems Interconnection(OSI)transport layer, or Layer 4. Its chief responsibility is to ensure reliable end-to-end connectivity. IP, located one layer （1）, at the OSI network layer, or Layer 3,communicates the addresses of each packet’s sender and receiver to the routers along the way .Routers and Layer 3 switches can read IP and other Layer 3 protocols. This information, combined with routing tables and other network intelligence, it takes to get across the room or around the world（2）TCP/IP.
The routing process begins with an IP address that is（3）to the sending end station. End stations may be assigned permanent IP addresses or they may borrow them as needed from a Dynamic Host Configuration Protocol(DHCP)server or other service. If the sending end station determines that the destination address is not local, the packet goes to a first-hop router, typically one that is close and has been reassigned to the（4）. The router inspects the packet’s IP address and performs a route table lookup to see if the destination end station resides on the local(physically connected)network, typically called an IP subnet. An IP subnet usually is assigned to each of the router’s network interfaces. If the destination IP address is local, the router searches an internal store of IP addresses and local-device media access control(MAC)addresses. This store is known as the Address Resolution Protocol(ARP) cache. ARP is the universal tool for（5）IP addresses to MAC addresses. If the destination’s MAC address appears, the router installs that MAC address in the packet header(removing its own MAC address because that’s no longer needed)and sends the packet to the destination end station.
（1）A. up
B. down
C. sideward
D. back-fence
（2）A. via
B. through
C. by
D. through out
（3）A. special
B. especial
C. unique
D. particular
（4）A. accepter
B. sender
C. router
D. server
（5）A. searching
B. looking
C. locating
D. matching
（25）
A. 不确定地址，不能分配给任何结点
B. 回环地址，结点用这种地址向自身发送IPv6分组
C. 不确定地址，可以分配给任何结点
D. 回环地址，用于测试远程结点的连通性
（26）
A. 不确定地址，不能分配给任何结点
B. 回环地址，结点用这种地址向自身发送IPv6分组
C. 不确定地址，可以分配给任何结点
D. 回环地址，用于测试远程结点的连通性
（61）
A. 一个站可以突然发送一个帧
B. 一个站可以不经过竞争就启动发送过程
C. 一个站可以连续发送多个帧
D. 一个站可以随机地发送紧急数据
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