下面的問題將幫助你評價你在本章中學(xué)習(xí)到的內(nèi)容。仔細(xì)閱讀所有的選項，因為正確答案可能多于1個。選擇每個問題中所有的正確答案。
1) match the following application layer services to their corresponding transport layer protocol port. (匹配下列的應(yīng)用層服務(wù)和它們對應(yīng)的傳輸層協(xié)議端口)：
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在哪一個o s i參考模型層運(yùn)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參考模型相比，t c p / i p協(xié)議具有幾層)？
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協(xié)議套件具有包含n e t b i o s、r p c和t l i功能的一個正式的會話層)。
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參考模型的哪層運(yùn)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哪一層運(yùn)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可以綁定在哪個協(xié)議上，選擇所有可能的協(xié)議)？
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 (哪層不在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 (傳輸層中的套接字是什么)？
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 (下面的哪一個服務(wù)使用了所謂的窗口機(jī)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向一個i p地址發(fā)送了一個i c m p回送命令，目的是確定是否存在到那個節(jié)點的網(wǎng)絡(luò)連接)？
a. true
b. false
21) which of the following best describes tcp/ip (下面的哪句話最準(zhǔn)確地說明了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的哪層使用的機(jī)制)？
a. data link layer
b. physical layer
c. presentation layer
d. transport layer
23) rpcs provide which of the following (rpc提供了下面的哪個功能)？
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 (分布式計算環(huán)境( d e c )是下面的哪一項的一個例子)？
a. osi model
b. rpc implementation
c. extreme data representation
d. a and b
25) which statement is true of winsock (下面對wi n s o c k的哪一句陳述是正確的)？
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 (下面關(guān)于t l i的哪一句陳述是正確的)？
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) (下面對于windows 命名服務(wù)器( w i n s )的陳述中，哪一句是正確的)？
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協(xié)議套件的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(在兩個系統(tǒng)之間提供可靠的數(shù)據(jù)交換中，哪一層是最重要的)？
a. physical layer
b. data link layer
c. session layer
d. transport layer
30) which of the following does tcp provide (tcp提供了下面的哪一個功能)？
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 (在下面各項中，哪一個字段不是t c p報頭的一部分)？
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報頭中的順序號的作用是什么)？
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 (在中間節(jié)點，例如一個路由器擁塞的情況下，可變滑動窗口提供了通知t c p的顯式機(jī)制)。
a. true
b. false
34) which of the following parameters is not a part of udp header (下面的哪一個參數(shù)不是u d p報頭的一部分)？
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 (當(dāng)一個路由器已經(jīng)配置為u d p泛洪時，當(dāng)數(shù)據(jù)報在網(wǎng)絡(luò)上傳播的過程中，源地址可能改變，但是目的地址不會改變)？
a. true
b. false
36) the spanning-tree algorithm allows (生成樹算法允許)：
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輔助地址是一種什么類型的尋址方法，在每一個接收到需要轉(zhuǎn)發(fā)的廣播接口上需要什么命令說明)？
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 (下面的哪一個協(xié)議提供了地址解析)？
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被認(rèn)為是不可靠的機(jī)制，因為它不保證發(fā)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 (下面對a r p的陳述中，哪一個是正確的)？
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 (一個主機(jī)的a r p高速緩存 一旦創(chuàng)建，則它永遠(yuǎn)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是一個廣播協(xié)議，并且使用了a r p高速緩存，原因是廣播太昂貴了)。
a. true
b. false
44) reverse address resolution protocol (rarp) is termed“r e v e r s e”because (反向地址解析協(xié)議( r a r p )中的“反向”的含義是)：
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 (逆向地址解析協(xié)議( 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參數(shù))？
a. redirect
b. source quench
c. echo reply
d. destination unreachable
47) icmp redirect is sent by (icmp重定向由什么發(fā)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是應(yīng)用層服務(wù)。
3) c。t c p / i p協(xié)議套有四層，o s i參考模型有7層。
4) b。錯。t c p / i p協(xié)議套沒有正式的會話層。
5) b。r p c的功能是透明訪問遠(yuǎn)程過程，使得它們作為本地的過程出現(xiàn)。
6) d。r p c是遠(yuǎn)程過程調(diào)用的縮寫。
7) c。套接字在會話層運(yùn)行。
8) d。套接字允許多個應(yīng)用程序使用相同的t c p / i p連接。
9) a。wi n s o c k是套接字的microsoft wi n d o w s版本。
10) c。傳輸層接口使得傳輸層和上層服務(wù)相互無關(guān)。
11) c。n e t b i o s在o s i模型的會話層上運(yùn)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上運(yùn)行。
13) b 。t c p / i p模式中沒有正式的表示層、會話層和數(shù)據(jù)鏈路層。
14) a。套接字就是一個i p地址加一個端口。
15) d。端口就是上層進(jìn)程訪問傳輸層的位置。
16) g。窗口技術(shù)是一個流控制的格式。
17) b 。u d p是一個無連接的、不可靠的傳輸協(xié)議。
18) c 。ip(internet protocol)就是從一個節(jié)點向另一個節(jié)點傳輸數(shù)據(jù)的網(wǎng)絡(luò)層協(xié)議。
19) a 。i c m p在網(wǎng)絡(luò)層上處理控制消息。
20) a 。正確。p i n g向i p地址發(fā)送i c m p回送命令，驗證可從本地主機(jī)到達(dá)這個地址。
21) c 。t c p / i p是動態(tài)改變的互連網(wǎng)絡(luò)協(xié)議的集合。
22) d 。t c p和u d p表示了t c p / i p協(xié)議結(jié)構(gòu)中的傳輸機(jī)制。
23) e。r p c為遠(yuǎn)程調(diào)用看上去像本地調(diào)用提供了透明性，而且還提供了異種系統(tǒng)間應(yīng)用程序的移植性。r p c是一個連接會話。
24) b 。d c e是一個r p c工具。
25) d。wi n s o c k表示了會話層a p i允許多個應(yīng)用程序共享一個internet 連接。它不是g u i。
26) c 。t l i表示system v應(yīng)用程序編程接口。
27) f。w i n s是m i c r o s o f t專有n e t b i o s命名服務(wù)器，該服務(wù)器提供了名稱解析的功能。
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層。
29) d。不管t c p / i p協(xié)議套件之間的基礎(chǔ)網(wǎng)絡(luò)如何，傳輸層是確定可靠數(shù)據(jù)傳輸?shù)淖钪匾膶印?
30) c。t c p提供了帶有可靠位組流的面向連接的虛電路，在此，位組流是連續(xù)的和非結(jié)構(gòu)化的。
31) a。子網(wǎng)掩碼不是t c p報頭的一部分。
32) d。t c p報頭中的順序號用來確認(rèn)，也用來記錄接收的8位位組以及拒絕重復(fù)的8位位組。
33) b 。錯。
34) b。緊急( u rg e n t )指針不是u d p報頭的一部分。u d p報頭有四個參數(shù)：源端口、目標(biāo)端口、長度和u d p校驗和。
35) b。錯。目標(biāo)地址可能改變，但是源地址不能改變。
36) c。生成樹以可控制的方式轉(zhuǎn)發(fā)數(shù)據(jù)包。
37) a。i p輔助地址是靜態(tài)尋址的格式，并且，它在每個接口需要轉(zhuǎn)發(fā)的廣播的接口上，需要i p報頭地址的規(guī)范。
38) b 。r a r p是反向地址解析協(xié)議。
3 9 ) a。正確。i p被視為不可靠的機(jī)制，因為它沒有保證遞送。
40) f。分段是發(fā)生在源和目標(biāo)之間路由器上的進(jìn)程。該進(jìn)程將數(shù)據(jù)報分解為適合于網(wǎng)絡(luò)傳輸?shù)膯蝹�幀的適當(dāng)尺寸。
41) a。使用a r p，管理員不必實際管理每個n i c的m a c地址。a r p從物理層和數(shù)據(jù)鏈路層中分離出路由選擇功能。a r p在目標(biāo)網(wǎng)絡(luò)上路由數(shù)據(jù)包，而不是在目標(biāo)主機(jī)上。
42) b。錯。主機(jī)的a r p緩存僅僅適用于確定的時間周期，然后它會超時。
43) a。正確。a r p是廣播協(xié)議，并且因為廣播的代價很高，所以使用a r p緩存。
44) b 。系統(tǒng)使用r a r p來解析i p地址。
45) b。逆向地址解析協(xié)議( i n a r p )通常由幀中繼這樣的非廣播網(wǎng)絡(luò)使用。
46) c 。p i n g命令使用回送請求和回送應(yīng)答參數(shù)。
47) b 。i c m p重定向通過網(wǎng)關(guān)發(fā)送到主機(jī)。在路由器檢測它的路由沒有另一個路由器的路由優(yōu)化時，它指令主機(jī)使用不同的路由。