题库精选:CCNA考试自测题第1卷

　　40) What does fragmentation in TCP/IP represent (在T C P / I P中的分段代表什么)？

　　A. Segmenting of datagrams into 53-byte packets for ATM applications

　　B. Division of larger datagrams into convenient size packets

　　C. A process that occurs on a router

　　D. A, B, and C

　　E. A and C only

　　F. B and C only

　　41) Which of the following statements is true of ARP (下面对A R P的陈述中，哪一个是正确的)？

　　A. It makes a MAC address logically independent of the physical hardware

　　B. It makes it necessary for the administrator to physically manage the MAC address of each N I C

　　C. It integrates routing function with the physical and data link layers

　　D. It routes packets based on destination host, not on destination network

　　42) A host’s ARP cache is good forever once it has been created (一个主机的A R P高速缓存 一旦创建，则它永远工作良好)。

　　A. True

　　B. False

　　43) ARP is a broadcast protocol, and ARP caching is used because broadcasts are expensive ( A R P是一个广播协议，并且使用了A R P高速缓存，原因是广播太昂贵了)。

　　A. True

　　B. False

　　44) Reverse Address Resolution Protocol (RARP) is termed“r e v e r s e”because (反向地址解析协议( R A R P )中的“反向”的含义是)：

　　A. It is used by the system that knows its IP address but does not know its MAC address

　　B. It is used by the system that knows its MAC address but does not know its IP address

　　C. It is used by the system that knows the destination’s IP address but does not know the d e s t i n a t i o n ’s MAC address

　　D. It is used by the system that knows the destination’s MAC address but does not know the d e s t i n a t i o n ’s IP address

　　45) Inverse Address Resolution Protocol (InARP) is generally used by (逆向地址解析协议( I n A R P )通常由什么使用)？

　　A. Broadcast networks

　　B. Nonbroadcast networks

　　C. Both broadcast and nonbroadcast networks

　　46) The PING command makes use of what ICMP parameter (PING命令使用了什么I C M P参数)？

　　A. Redirect

　　B. Source quench

　　C. Echo reply

　　D. Destination unreachable

　　47) ICMP Redirect is sent by (ICMP重定向由什么发出)？

　　A. A host to the gateway

　　B. A gateway to the host

　　C. A router to another router

　　D. A router to a network