D Clients do not directly communicate with each other.
39. A process sends messages into, and receives messages from, the network through its . A socket B program C client D peer 40. Which one is not defined by an application-layer protocol? A the types of messages exchanged B the syntax of various message types C the semantics of the fields
D rules for determining when and how to translate the socket 41. HTTP can use two types of connections, which are . A persistent and non-persistent connection B connection with pipelining and without pipelining C TCP and UDP
D parallel and serial connection
42. takes for a small packet to travel from client to server and then back to the client. A RDT B threshold C RTT D overhead 43. The default mode of HTTP uses . A non-persistent connection with pipelining B non-persistent connection without pipelining C persistent connection with pipelining D persistent connection without pipelining
44. In HTTP request messages, the request line has three fields, there are . A the method field, the URL field and the HTTP version field B the method, the connection and URL field
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C the user-agent, the method and HTTP version field D the user-agent, the URL and the HTTP version field
45. In the header lines of HTTP request message, if the field of Connection is close, it specifies .
A the host on which object resides B what type of the user agent
C that the browser wants the server to close the connection after sending the requested object
D which language can the browser receive
46. In HTTP response message, if the status code is 404, it means . A request succeeded and the information is returned in the response B requested object has been permanently moved
C the requested HTTP protocol version is not supported by the server D the requested document does not exist on this server
47. is a network entity that satisfies HTTP requests on the behalf of an origin Web server.
A proxy server B local server C DNS server D Web server 48. In the following four options about web cache, which one is not correct? A A web cache is both a server and a client at the same time. B A web cache is purchased and installed by an ISP.
C A web cache can raise the response time for a client request.
D A web cache can reduce traffic on an institution’s access link to the Internet. 49. The request message in the conditional GET must include the header line. A Last-Modified B Last-Referenced
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C If-Modified-Since D If –Referenced-Since
50. FTP uses two parallel connections to transfer a file, they are . A TCP and UDP connection
B connection with pipelining and without pipelining C control an data connection
D client-server and browser-server connection
51. In FTP commands, which one is used to ask the server to send back a list of all files in the current remote directory?
A USER B PASS C LIST D RETR 52. In the Internet mail system, allow users to read, reply to, forward, save and compose message.
A User agents B mail servers C SMTP D TCP 53. The two key MIME headers for supporting multimedia are . A Content-Type and MIME-Version
B Content-Type and Content-Transfer-Encoding C Content-Transfer-Encoding and MIME-Version D MIME-Version and MIME-Type
54. For Internet mail, the mail access protocol is used to .
A transfer mail from the recipient’s mail server to the recipient’s user agent B transfer mail from the sender’s mail server to the recipient’s mail server C translate the mail from the sender’s mail server D translate the mail into the recipient’s mail server
55. POP3 progresses through three phases, which they are . A authorization, translation and transaction
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B authorization, translation and update C authorization, transaction and update D translation, transaction and update
56. In the following four services, which one can not provide by DNS? A Host aliasing B Mail server aliasing C translate hostname to IP addresses D translate MAC addresses to IP addresses
57. There are three classes of DNS servers, there are .
A root DNS server, top-level domain DNS server and local DNS server B root DNS server, top-level domain DNS server and authoritative DNS server C root DNS server, local DNS server and authoritative DNS server D root DNS server, local DNS server and top-level domain DNS server 58. In the following four options about POP3, which one is not correct? A The user agent employed only three commands: List, Retr and Quit B The server does not carry state information across POP3 sessions C The port number is 110
D The POP3 protocol does not provide any means for a user to create remote folders and assign messages to folders.
64. In the following four options about P2P file-sharing, which one is not correct? A P2P file-sharing is highly scalable. B P2P file-sharing relies on P2P architecture.
C The means for locating content in different P2P file-sharing are different.
D P2P file-sharing systems not only share MP3s,but also videos, software, documents and images.
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66. If the header line Connection is close, it means that the client wants . A persistent connection with pipelining B persistent connection without pipelining C nonpersistent connection D not connection
67. In HTTP request message, the entity body is empty with the method, but is used with the method.
A GET, POST B POST,GET C GET, HEAD D POST, HEAD 68. In HTTP response message, if the Date: header ;one indicates the time Fri. 08 Aug. 2008 12:00:00 GMT, the Last-Modified: header line can not be . A Fri. 08 Aug. 2008 11:00:00 GMT B Fri. 08 Aug. 2008 11:30:00 GMT C Fri. 08 Aug. 2008 12:00:00 GMT D Fri. 08 Aug. 2008 12:30:00 GMT 69. In the following four options, which one is not the part of cookie technology? A Cookie header lines in the HTTP response message and request message.
B One cookie header file kept on the user’s end system and managed by the user’s browser. C A network entity that satisfies HTTP requests on the behalf of an origin Web server. D A back-end database at the Web site
70. On-top of stateless HTTP, can be used to create a user session layer. A proxy server B Web cache C cookie D socket 71. Processes communicate with each other by reading from and writing to . A programs B threads C sockets D channels 72. In the following four options about network architecture, which one is not correct? A The network architecture is fixed.
B The network architecture provides a specific set of services to application.
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