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课件

Chapter 2 Application Layer

1. In the following four descriptions, which one is correct?

A In C/S architecture, clients communicate with each other directly.

B In C/S architecture, client has a fixed well-known address.

C In P2P architecture, peers communicate with each other directly.

D In P2P architecture, peer has a fixed well-known address.

2. In the context of a communication session between a pair of process, the process that initiates the communication is labeled as the , the process that waits to be contacted to begin the session is labeled as the .

A client process, server process B sending process, receiving process

C input process, output process D communicating process, connecting process

3. A socket is the interface between within a host.

A the network layer and the link layer

B the link layer and the physical layer

C the application layer and the transport layer

D the transport layer and the network layer

4. In the following applications, which one is a loss-tolerant application?

A E-mail B file transfer C instant messaging D real-time audio

5. In the following applications, which one is a bandwidth-sensitive application?

A E-mail B web application C real-time audio D file transfer

6. The service of TCP can’t guarantee .

A delivery of all data without error B delivery of all data in the proper order

C the rate of delivery D congestion control

7. In the following applications, which one uses UDP?

A E-mail B web application C file transfer D DNS

8. In the following descriptions about HTTP, which one is not correct?

A HTTP uses non-persistent connections in its default mode.

B HTTP uses TCP as its underlying transport protocol.

C HTTP is a stateless protocol.

D HTTP is client-server architecture.

9. Suppose a web page consists of a base HTML file, 5 JEPG images and a java applet, and also suppose