ESAT Forouzan - Chapter 22: Process-to-Process Delivery (UDP and TCP)

Question 1

UDP and TCP are both _____ layer protocols
a. Physical
b. Data Link
c. Network
d. Transport

Answer 1

d. Transport

Question 2

Which of the following functions does UDP perform?
a. Process-to-process communication
b. Host-to-host communication
c. End-to-end reliable data delivery
d. All of the above

Answer 2

a. Process-to-process communication

Question 3

UDP needs the _____ address to deliver the user datagram to the correct application program.
a. Port
b. Application
c. Internet
d. Physical

Answer 3

a. Port

Question 4

Which is a legal port address?
a. 0
b. 513
c. 65,535
d. All of the above

Answer 4

d. All of the above

Question 5

The definition of reliable delivery includes ____
a. Error-free delivery
b. Receipt of the complete message
c. In-order delivery
d. All of the above

Answer 5

d. All of the above

Question 6

Which of the following does the UDP guarantee?
a. Sequence numbers on each user datagram
b. Acknowledgments to the sender
c. Flow control
d. None of the above

Answer 6

d. None of the above

Question 7

The source port address on the UDP user datagram header defines ___
a. The sending computer
b. The receiving computer
c. The application program on the sending computer
d. The application program on the receiving computer

Answer 7

c. The application program on the sending computer

Question 8

Which of the following is not part of the UDP user datagram header?
a. Length of header
b. Source port address
c. Checksum
d. Destination port address

Answer 8

a. Length of header

Question 9

The ______ defines the client program
a. Ephemeral port number
b. IP address
c. Well-known port number
d. Physical address

Answer 9

a. Ephemeral port number

Question 10

The _______ defines the server program
a. Ephemeral port number
b. IP address
c. Well-known port number
d. Physical address

Answer 10

c. Well-known port number

Question 11

IP is responsible for ____ communication while TCP is responsible for ________ communication
a. Host-to-host; process-to-process
b. Process-to-process; host-to-host
c. Process-to-process; node-to-node
d. Node-to-node; process-to-process

Answer 11

a. Host-to-host; process-to-process

Question 12

A host can be identified by _______ while a program running on the host can be identified by _____
a. An IP address ; a port number
b. A port number ; an IP address
c. An IP address ; a host address
d. An IP address ; a well-known port

Answer 12

a. An IP address ; a port number

Question 13

The ______ address uniquely identifies a running application program
a. IP address
b. Host
c. NIC
d. Socket

Answer 13

d. Socket

Question 14

The ______ field is used to order packets of a message.
a. Urgent pointer
b. Checksum
c. Sequence number
d. Acknowledgment number

Answer 14

c. Sequence number

Question 15

The _____ field is used for error detection.
a. Urgent pointer
b. Checksum
c. Sequence number
d. Acknowledgment number

Answer 15

b. Checksum

Question 16

Multiply the header length field by _______ to find the total number of bytes in the TCP header
a. 2
b. 4
c. 6
d. 8

Answer 16

b. 4

Question 17

Urgent data require the urgent pointer field as well as the URG bit in the _____ field
a. Control
b. Offset
c. Sequence number
d. Reserved

Answer 17

a. Control

Question 18

In ______, data are sent or processed at a very inefficient rate, such as one byte at a time
a. Nagle’s syndrome
b. Silly window syndrome
c. Sliding window syndrome
d. Delayed acknowledgment

Answer 18

b. Silly window syndrome

Question 19

To prevent silly window syndrome created by a receiver that processes data at a very slow rate, _____ can be used.
a. Clark’s solution
b. Nagle’s algorithm
c. Delayed acknowledgment
d. (a) or (c)

Answer 19

d. (a) or (c)

Question 20

To prevent silly window syndrome created by a sender that processes data at a very slow rate, _____ can be used.
a. Clark’s solution
b. Nagle’s algorithm
c. Delayed acknowledgment
d. (a) or (c)

Answer 20

b. Nagle’s algorithm

Question 21

An ACK number of 1000 always means that _____
a. 999 bytes has been successfully received
b. 1000 bytes has been successfully received
c. 1001 bytes has been successfully received
d. None of the above

Answer 21

d. None of the above

Question 22

The _____ timer prevents a long idle connection between two TCPs
a. Retransmission
b. Persistence
c. Keep-alive
d. Time-waited

Answer 22

c. Keep-alive

Question 23

The ____ timer is needed to handle the zero window-size advertisement
a. Retransmission
b. Persistence
c. Keep-alive
d. Time-waited

Answer 23

b. Persistence

Question 24

Karn’s algorithm is used in calculations by the ______ timer
a. Retransmission
b. Persistence
c. Keep-alive
d. Time-waited

Answer 24

a. Retransmission

Question 25

The ____ timer is used in the termination phase
a. Retransmission
b. Persistence
c. Keep-alive
d. Time-waited

Answer 25

d. Time-waited

Question 26

The _____ timer keeps track of the time between the sending of a segment and the receipt of an acknowledgment
a. Retransmission
b. Persistence
c. Keep-alive
d. Time-waited

Answer 26

a. Retransmission

Question 27

Connection establishment involves a _______handshake.
a. One-way
b. Two-way
c. Three-way
d. None of the above

Answer 27

c. Three-way

Question 28

A special segment called a probe is sent by sending a TCP when the _____ timer goes off.
a. Transmission
b. Persistence
c. Keep-alive
d. Time-waited

Answer 28

b. Persistence