Saudi Electronic University IT 210 CHAPTER 23 1)One of the main duties of the transport layer is to provide___communication

Saudi Electronic University

IT 210

CHAPTER 23

1)One of the main duties of the transport layer is to provide___communication.

A) node-to-node

B)            host-to-host

C)            process-to-process

D)           None of the choices are correct

2 A client program normally uses              port number. A server program normally uses   port number.

A) a well-known; an ephemeral B) an ephemeral; a well-known C) a private; a well-known

D) None of the choices are correct

3 A socket address is a combination of   . A) a MAC address and a logical address

B)            a MAC address and a port number

C)            a user-specific address and a logical address D) None of the choices are correct

4              means accepting items from more than one source.                         means delivering items to more than one source.

A)  Demultiplexing;  Multiplexing B)  Multiplexing; Demultiplexing C) Encapsulation; Decapsulation D) Pulling; Pushing

5              means the producer delivers the items when they are produced.                  means the consumer takes the items when it is ready to do so.

A) Pushing; Pulling B) Pulling; Pushing

C)            Forwarding; Accepting

D)           None of the choices are correct

6 In the stop-and-wait protocol, the maximum send window size is         and the maximum receive window size is                , where m is the number of bits in

the sequence. A) 1; 1

B) 2m; 1

C)  1;  2m D) 2m ; 2m

7 In the Go-Back-N protocol, the maximum send window size is                and the maximum receive window size is                , where m is related to the number of

bits in the sequence number. A) 1; 1

B) 1; 2m

C) 2m − 1; 1

D) 2m − 1; 2m – 1

8 In the selective-repeat protocol, the maximum send window size is     and the maximum receive window size is                , where m is the number of bits

in the sequence. A) 1; 1

B) 1; 2m − 1

C) 2m − 1; 1

D) 2m − 1; 2m – 1

9 UDP is a            _transport protocol. A) connectionless, reliable

B) connection-oriented, unreliable C) connectionless, unreliable

D) None of the choices are correct

10 UDP is an acronym for              . A) User Delivery Protocol

B) User Datagram Procedure C) User Datagram Protocol

D) None of the choices are correct

11 At the transport layer, to define the processes, we need two identifiers called

                .

A) logical  addresses B) physical addresses C) port addresses

D) None of the choices are correct

12 The ports ranging from 0 to 1,023 are called the           ports. The ports ranging from 1,024 to 49,151 are called ports. The ports

ranging from 49,152 to 65,535 are called the        ports. A) well-known; registered; dynamic or private

B) registered; dynamic or private; well-known C) private or dynamic; well-known; registered D) private or dynamic; registered; well-known

13 UDP and TCP are two protocols at the              layer. A) data-link

B) network C) transport

D) application

14 A port number is        bits long. A) 8

B) 16 C) 32 D) 64

15 Communication at the transport layer is          . A) node-to-node

B)  end-to-end C) node-to-host D) host-to-node

16 In Go-Back-N, the values of Sf = 3 and Sn = 7, after receiving a packet with ackNo = 6, the value of Sf is             .

A) 6 B) 7 C) 5

D) None of the choices are correct

17 In Go-Back-N, the values of Sf = 3 and Sn = 7, after receiving a packet with ackNo = 6, the value of Sn is            .

A) 6 B) 7 C) 5

D) None of the choices are correct

18 In Go-Back-N, the values of Sf = 3 and Sn = 7, after receiving a packet with ackNo = 5, the window      .

A) slides two slots B) slides one slot

C) slides three slots D) does not slide

19 In Selective Repeat, the values of Sf = 3 and Sn = 7, after receiving a packet with ackNo

= 5, the window               . A) slides two slots

B) slides  one  slot C) slides three slots D) does not slide

20 In Selective Repeat, when a timeout occurs, the timer is         . A) stopped

B)            started

C)            reset (stopped and started)

D)           None of the choices are correct