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Student Solutions Out of 20 questions, you answered 7 correctly with a final grade of 35%
7 correct (35%)
13 incorrect (65%)
0 unanswered (0%)
Your Results:
The correct answer for each question is indicated by a .

1 CORRECT 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 CORRECT 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 __________.

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 CORRECT ______________ 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
INCORRECT 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
INCORRECT 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 CORRECT 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
INCORRECT 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 CORRECT 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 _______.

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 ____________.
INCORRECT
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
INCORRECT 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.

B) network

C) transport

D) application

14 A port number is _______ bits long.

B) 16

C) 32

D) 64

15 Communication at the transport layer is _________.

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
INCORRECT 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
CORRECT 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
INCORRECT ________.
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
INCORRECT 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 ________.

B) started

C) reset (stopped and started)

D) None of the choices are correct

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Date: Fri Dec 08 2017 12:54:00 GMT-0500 (EST)Fri Dec 08 2017 12:52:20 GMT-0500 (EST)
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