在自治系统内部的各个路由器之间,运行的是内部网关协议IGP。早期的IGP叫做 (1) ,它执行 (2) 。当网络规模扩大时,该算法使得传送的路由信息太多,增加了网络负载,后来又出现了执行最短路径优先算法的IGP。按照这种协议,每个路由器向网络中的其他路由器发布 (3) ,当路由信息改变后,路由器按照 (4) 算法更新路由表。在不同自治系统的路由器之间,运行外部网关协议EGP,典型的EGP是 (5) 。 2()
A. 路由选择算法
B. 距离矢量算法
C. 链路状态算法
D. 内部网关算法
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For each blank,choose the best answer from the four choices and write down on the answer sheet.(1) is a protocol that a host uses to inform a router when it joins or leaves an Internet multicast group.(2) is an error detection code that most data communication networks use.(3) is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.(4) is a transfer mode in which all types of information are organized into fixed form cells on an asynchronous or non -periodic basis over a range of media.(5) is an identifier of a web page. 1()
A. SMTP
B. ICMP
C. RARP
D. IGMP
在自治系统内部的各个路由器之间,运行的是内部网关协议IGP。早期的IGP叫做 (1) ,它执行 (2) 。当网络规模扩大时,该算法使得传送的路由信息太多,增加了网络负载,后来又出现了执行最短路径优先算法的IGP。按照这种协议,每个路由器向网络中的其他路由器发布 (3) ,当路由信息改变后,路由器按照 (4) 算法更新路由表。在不同自治系统的路由器之间,运行外部网关协议EGP,典型的EGP是 (5) 。 1()
A. RIP
B. GGP
C. BGP
D. OSPF
RS-232C是 (1) 之间的接口标准,其规定的电平表示方式为 (2) 。当使用 RS232C连接相关设备时,电缆的长度不应超过 (3) m。当用RS232C直接连接两台计算机时,采用零调制解调器方式,其连接方式为 (4) 。当计算机需要通过相连的MO- DEM发送数据时,依次设置的信号是 (5) 。 5()
A. MODEM就绪→DTE就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清MODEM就绪→清DTE就绪
B. MODEM就绪→DTE就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清DTE就绪→清MODEM就绪
C. DTE就绪→MODEM就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清MODEM就绪→清DTE就绪
DTE就绪→MODEM就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清DTE就绪→清MODEM就绪
Frame Relay is simplified form of (1) , similar in principle to (2) , in which synchronous, frames of data are routed to different destinations depending on header information.Packets are routed throught one or more Virtual Circuits known as (3) Most Virtual Circuits are (4) , which means that the network provider sets up all DLCI connections at subscription time. (5) are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session. 3()
A. DLCIs
B. HDLCs
C. SDLCs
DLs