计算机网络英文题库(附答案)chapter3计算机网络英文题库(附答案)chapter3

Chapter 3 Transport Layer

1. A transport-layer protocol provides for logical communication between ____.

A Application processes

B Hosts

C Routers

D End systems

2. Transport-layer protocols run in ____.

A Servers

B Clients

C Routers

D End systems

3. In transport layer, the send side breaks application messages into ____, passes to network layer.

A Frames

B Segments

C Data-grams

D bit streams

4. Services provided by transport layer include ____.

A HTTP and FTP

B TCP and IP

C TCP and UDP

D SMTP

5. Which of the following services is not provided by TCP?

A Delay guarantees and bandwidth guarantees

B Reliable data transfers and flow controls

C Congestion controls

D In-order data transfers

6. These two minimal transport-layer services____ and ____are the only two services that UDP provides!

A process-to-process data delivery, error checking

B congestion control, reliable data transfer

C flow control, congestion control

D In-order data transfer, error checking

7. Port number’s scope is ____ to ____.

A 0, 1023

B 0, 65535

C 0, 127

D 0,255

8. The port numbers ranging from ____to ____ are called well-known port number and are restricted.

A 0, 1023

B 0, 65535

C 0, 127

D 0,255

9. UDP socket identified by two components, they are ____.

A source IP addresses and source port numbers

B source IP addresses and destination IP addresses

C destination IP address and destination port numbers

D destination port numbers and source port numbers

10. TCP socket identified by a (an) ____.

A 1-tuple

B 2-tuple

C 3-tuple

D 4-tuple

11. Which of the following applications normally uses UDP services?

A SMTP

B Streaming multimedia

C FTP

D HTTP

12.?Reliable?data?transfer?protocol?over?a?perfectly?reliable?channel?is____.??

A??rdt1.0???B??rdt2.0?C??rdt3.0???D??rdt2.1?

13.?Reliable?data?transfer?protocol?over?a?channel?with?bit?errors?and?packet?losses?is?____.?

?A??rdt1.0??B??rdt2.0?C??rdt3.0???D??rdt2.1?

14.?Which?of?the?following?about?reliable?data?t