题库精选:CCNA考试自测题第1卷
1) match the following application layer services to their corresponding transport layer protocol port. (匹配下列的应用层服务和它们对应的传输层协议端口)：
a. smtp 1. tcp/23
b. ftp 2. tcp/25
c. tftp 3. tcp/80
d. te l n e t 4. tcp/21
e. http 5. udp/69
f. dns 6. tcp/53
2) which osi reference model layer does telnet function at (te l n e t在哪一个o s i参考模型层运作)?
a. transport
b. network
c. session
d. application
3) how many layers does the tcp/ip protocol suite have, compared to the osi reference model (和o s i参考模型相比，t c p / i p协议具有几层)?
a. tcp model has 4, osi model has 6
b. tcp model has 7, osi model has 8
c. tcp model has 4, osi model has 7
d. tcp model has 7, osi model has 4
4) the tcp/ip protocol suite has a formal session layer that includes netbios、rpcs and tli functions (tcp/ip协议套件具有包含n e t b i o s、r p c和t l i功能的一个正式的会话层)。
a. true
b. false
5) what is the function of rpcs (rpc的功能是什么)?
a. to move files from remote pcs to a local pc
b. to make remote function calls transparent, so they appear to be local
c. to initialize a program on a remote pc
d. to send a procedure that is local to a remote node for processing elsewhere
6) what does rpc stand for (rpc代表什么)?
a. remote personal computer
b. reserved-programming call
c. routed-procedure call
d. remote-procedure call
7) what osi reference model layer do sockets function at (套接字在o s i参考模型的哪层运作)?
a. application
b. presentation
c. session
d. transport
e. network
f. data link
g. physical
8) what function do sockets perform (套接字的功能是什么)?
a. they make remote functions appear local, transparent to the user
b. they transfer files to and from remote nodes
c. they make the transport layer independent
d. they allow multiple applications to share the same connection to the network
9) what is winsock (什么是wi n s o c k )?
a. a version of sockets for the microsoft windows platform
b. sockets on bsd unix
c. a session layer api commonly considered to be its own protocol
d. a network layer service for microsoft wi n d o w s
10) what does tli do (tli的作用是什么)?
a. it makes remote functions appear local, transparent to the user
b. it transfers files to and from remote nodes
c. it makes the transport layer independent
d. it allows multiple applications to share the same connection to the network
11) what osi layer does netbios function at (netbios在o s i哪一层运作)?
a. application
b. presentation
c. session
d. transport
e. network
f. data link
g. physical
12) which protocols can netbios bind to? (select all that are applicable.) (netbios可以绑定在哪个协议上，选择所有可能的协议)?
a. appletalk
b. ipx
c. ip
d. netbeui
13) what layers do not exist in the tcp/ip model that are in the osi model (哪层不在t c p / i p模型中，但它在o s i模型中)?
a. application, presentation, and network
b. presentation, session, and data link
c. session, network, and physical
d. presentation, data link, and physical
14) what is a socket in the transport layer (传输层中的套接字是什么)?
a. the socket is an ip address plus a port
b. an api that makes the transport layer independent
c. an api that allows multiple applications to share a network connection
d. a function that makes remote procedures appear to be local
15) what is a port (什么是端口)?
a. an api that makes the transport layer independent
b. an api that allows multiple applications to share a network connection
c. a function that makes remote procedures appear to be local
d. the point where upper-layer processes access transport layer services
16) which of the following services uses a process called windowing (下面的哪一个服务使用了所谓的窗口机制)?
a. reliable data transfer
b. connection-oriented virtual circuit
c. buffered transfer
d. resequencing
e. multiplexing
f. efficient, full-duplex transmission
g. flow control
17) what is udp (什么是u d p )?
a. an api that makes the transport layer independent
b. a connectionless, unreliable transport protocol
c. an api that allows multiple applications to share a network connection
d. a function that makes remote procedures appear to be local
18) what is ip (什么是i p )?
a. it is the transport mechanism for upper layer services
b. it is the session layer api for making the transport layer independent
c. it is the network layer protocol that moves data from one node to another
d. it is the physical layer protocol for internet connections
19) what is icmp (什么是i c m p )?
a. it is a network layer protocol that handles control messages
b. it is a network layer protocol that resolves addresses
c. it is a session layer api that makes remote procedures transparent to a user
d. it is a transport layer function for unreliable transport
20) ping sends an icmp echo command to an ip address in order to determine whether anetwork connection exists to that node (ping向一个i p地址发送了一个i c m p回送命令，目的是确定是否存在到那个节点的网络连接)?
a. true
b. false
21) which of the following best describes tcp/ip (下面的哪句话最准确地说明了t c p / i p )?
a. a static protocol
b. a proprietary protocol
c. a collection of internetworking protocols
22) udp and tcp represent mechanisms used by which layer of the tcp/ip (udp和t c p表示了t c p / i p的哪层使用的机制)?
a. data link layer
b. physical layer
c. presentation layer
d. transport layer
23) rpcs provide which of the following (rpc提供了下面的哪个功能)?
a. connection-oriented session
b. transparency to make remote calls look local
c. portability of applications between heterogeneous systems
d. a and c only
e. b and c only
f. a, b, and c
24) distributed computing environment (dce) is an example of (分布式计算环境( d e c )是下面的哪一项的一个例子)?
a. osi model
b. rpc implementation
c. extreme data representation
d. a and b
25) which statement is true of winsock (下面对wi n s o c k的哪一句陈述是正确的)?
a. it is a mac application
b. it represents a graphical user interface
c. it represents a network layer
d. it provides the means for sharing an internet connection between multiple ip protocol suite utilities
26) which statement is true of tli (下面关于t l i的哪一句陈述是正确的)?
a. it is a layer in the osi model
b. it is a layer in the tcp/ip model
c. it is a system v api
d. it is part of the unix kernel
27) which statement is true of windows name server (wins) (下面对于windows 命名服务器( w i n s )的陈述中，哪一句是正确的)?
a. it is a protocol
b. it provides capability for name resolution
c. it is a network layer
d. it is a proprietary name server
e. a, b, and d only
f. b and d only
28) icmp、i p、arp and rarp of the ip protocol suite map to (ip协议套件的i c m p、i p、a r p和r a r p映射到)：
a. osi layers 1 and 2
b. osi layer 5
c. osi layer 3
d. osi layer 2
29) which layer is most important in providing reliable data exchange between two systems(在两个系统之间提供可靠的数据交换中，哪一层是最重要的)?
a. physical layer
b. data link layer
c. session layer
d. transport layer
30) which of the following does tcp provide (tcp提供了下面的哪一个功能)?
a. unreliable data stream
b. connectionless virtual circuit
c. flow control
d. structured byte stream movement
31) of the following, which field is not a part of the tcp header (在下面各项中，哪一个字段不是t c p报头的一部分)?
a. subnet mask
b. sequence number
c. data offset
d. destination port
32) what is the sequence number in a tcp header used for (在t c p报头中的顺序号的作用是什么)?
a. acknowledgments
b. reordering of the octets received
c. rejecting duplicate octets
d. all of the above
33) variable sliding windows provide an explicit mechanism for notifying tcp if an intermediate node (for example, a router) becomes congested (在中间节点，例如一个路由器拥塞的情况下，可变滑动窗口提供了通知t c p的显式机制)。
a. true
b. false
34) which of the following parameters is not a part of udp header (下面的哪一个参数不是u d p报头的一部分)?
a. source port
b. urgent pointer
c. checksum
d. length
e. destination port
35) when a router has been configured for udp flooding, the source address might change,but the destination address will not change as the datagram propagates through the network (当一个路由器已经配置为u d p泛洪时，当数据报在网络上传播的过程中，源地址可能改变，但是目的地址不会改变)?
a. true
b. false
36) the spanning-tree algorithm allows (生成树算法允许)：
a. forwarding of packets with no control
b. forwarding of broadcasts to an interface which already has received the broadcast
c. prevention of duplication of forwarding of packets
d. a and b only
37) ip helper addresses are a form of _ _ _ _ _ _ _ _ _ _ _ _ _ _ addressing and require the command specification of _ _ _ _ _ _ _ _ _on every interface receiving broadcasts that need to be forwarded (ip辅助地址是一种什么类型的寻址方法，在每一个接收到需要转发的广播接口上需要什么命令说明)?
a. static / ip header address
b. dynamic / ip forward-protocol udp
c. dynamic / ip forward-protocol tcp
38) which of the following protocols provide address resolution (下面的哪一个协议提供了地址解析)?
a. icmp
b. rarp
c. ip
d. udp
e. tcp
39) ip is described as an unreliable mechanism because it does not guarantee delivery (ip被认为是不可靠的机制，因为它不保证发送)。
a. true
b. false
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
a.4 第4章答案
1) a-2，b - 4，c - 5，d - 1，e - 3，f - 6
2) d。te l n e t是应用层服务。
3) c。t c p / i p协议套有四层，o s i参考模型有7层。
4) b。错。t c p / i p协议套没有正式的会话层。
5) b。r p c的功能是透明访问远程过程，使得它们作为本地的过程出现。
6) d。r p c是远程过程调用的缩写。
7) c。套接字在会话层运行。
8) d。套接字允许多个应用程序使用相同的t c p / i p连接。
9) a。wi n s o c k是套接字的microsoft wi n d o w s版本。
10) c。传输层接口使得传输层和上层服务相互无关。
11) c。n e t b i o s在o s i模型的会话层上运作。
12) b ，c，d。n e t b i o s可用在i p x、i p和n e t b e u i上运行。
13) b 。t c p / i p模式中没有正式的表示层、会话层和数据链路层。
14) a。套接字就是一个i p地址加一个端口。
15) d。端口就是上层进程访问传输层的位置。
16) g。窗口技术是一个流控制的格式。
17) b 。u d p是一个无连接的、不可靠的传输协议。
18) c 。ip(internet protocol)就是从一个节点向另一个节点传输数据的网络层协议。
19) a 。i c m p在网络层上处理控制消息。
20) a 。正确。p i n g向i p地址发送i c m p回送命令，验证可从本地主机到达这个地址。
21) c 。t c p / i p是动态改变的互连网络协议的集合。
22) d 。t c p和u d p表示了t c p / i p协议结构中的传输机制。
23) e。r p c为远程调用看上去像本地调用提供了透明性，而且还提供了异种系统间应用程序的移植性。r p c是一个连接会话。
24) b 。d c e是一个r p c工具。
25) d。wi n s o c k表示了会话层a p i允许多个应用程序共享一个internet 连接。它不是g u i。
26) c 。t l i表示system v应用程序编程接口。
27) f。w i n s是m i c r o s o f t专有n e t b i o s命名服务器，该服务器提供了名称解析的功能。
28) c 。i c m p、i p、a r p和r a r p都映射到o s i第3层。
29) d。不管t c p / i p协议套件之间的基础网络如何，传输层是确定可靠数据传输的最重要的层。
30) c。t c p提供了带有可靠位组流的面向连接的虚电路，在此，位组流是连续的和非结构化的。
31) a。子网掩码不是t c p报头的一部分。
32) d。t c p报头中的顺序号用来确认，也用来记录接收的8位位组以及拒绝重复的8位位组。
33) b 。错。
34) b。紧急( u rg e n t )指针不是u d p报头的一部分。u d p报头有四个参数：源端口、目标端口、长度和u d p校验和。
35) b。错。目标地址可能改变，但是源地址不能改变。
36) c。生成树以可控制的方式转发数据包。
37) a。i p辅助地址是静态寻址的格式，并且，它在每个接口需要转发的广播的接口上，需要i p报头地址的规范。
38) b 。r a r p是反向地址解析协议。
3 9 ) a。正确。i p被视为不可靠的机制，因为它没有保证递送。
40) f。分段是发生在源和目标之间路由器上的进程。该进程将数据报分解为适合于网络传输的单个帧的适当尺寸。
41) a。使用a r p，管理员不必实际管理每个n i c的m a c地址。a r p从物理层和数据链路层中分离出路由选择功能。a r p在目标网络上路由数据包，而不是在目标主机上。
42) b。错。主机的a r p缓存仅仅适用于确定的时间周期，然后它会超时。
43) a。正确。a r p是广播协议，并且因为广播的代价很高，所以使用a r p缓存。
44) b 。系统使用r a r p来解析i p地址。
45) b。逆向地址解析协议( i n a r p )通常由帧中继这样的非广播网络使用。
46) c 。p i n g命令使用回送请求和回送应答参数。
47) b 。i c m p重定向通过网关发送到主机。在路由器检测它的路由没有另一个路由器的路由优化时，它指令主机使用不同的路由。
- 文章
- 推荐
- 热门新闻