Networking Chapter 24

Question 1

UDP and TCP are two protocols at the ___________ layer.

Answer 1

transport

Question 2

A port number is _______ bits long.

Answer 2

16

Question 3

Which of the following does UDP provide?
	A)	Flow control
	B)	Connection-oriented delivery
	C)	Error control
	D)	None of the choices are correct

Answer 3

None of the choices are correct

Question 4

The source port number on the UDP user datagram header defines _______.

Answer 4

the process running on the sending computer

Question 5

To use the services of UDP, we need ________ socket addresses.

Answer 5

two

Question 6

UDP packets are called __________.

Answer 6

user datagrams

Question 7

UDP packets have a fixed-size header of _______ bytes.

Answer 7

8

Question 8

TCP is a __________protocol.

Answer 8

byte-oriented

Question 9

TCP groups a number of bytes together into a packet called a ___________.

Answer 9

segment

Question 10

TCP is a(n) ___________ protocol.

Answer 10

connection-oriented

Question 11

TCP is a(n) _______ transport protocol.

Answer 11

reliable

Question 12

TCP uses _________________ to check the safe and sound arrival of data.

Answer 12

an acknowledgment mechanism

Question 13

The bytes of data being transferred in each connection are numbered by TCP. The numbering starts with a __________________.

Answer 13

randomly generated number

Question 14

In TCP, the sequence number for each segment is the number of the _______ byte (virtual byte) carried in that segment.

Answer 14

first

Question 15

Communication in TCP is ___________.

Answer 15

full-duplex

Question 16

In TCP, the value of the acknowledgment field in a sent segment defines the sequence number related to the ______byte a party expects to receive next.

Answer 16

next

Question 17

The inclusion of the checksum in the TCP segment is ________.

Answer 17

mandatory

Question 18

In TCP, a SYN segment consumes _____ sequence number(s).

Answer 18

one

Question 19

In TCP, a SYN + ACK segment consumes _____ sequence numbers.

Answer 19

one

Question 20

In TCP, an ACK segment, if carrying no data, consumes ______ sequence number(s).

Answer 20

no

Question 21

The connection establishment procedure in TCP is susceptible to a serious security problem called the _________ attack.

Answer 21

SYN flooding

Question 22

The SYN flooding attack belongs to a group of security attacks known as a _____ attack.

Answer 22

denial of service

Question 23

In TCP, a FIN segment consumes ____ sequence numbers if it does not carry data.

Answer 23

one

Question 24

In TCP, a FIN + ACK segment consumes _____ sequence number(s) if it does not carry data.

Answer 24

one

Question 25

In TCP, one end can stop sending data while still receiving data. This is called a ______ termination.

Answer 25

half-close