Transport layer Chap 7

Question 1

What are the 3 primary responsibilities of the transport layer?

Answer 1

1. Tracking the individual communication between applications on the source and destination hosts
2. Segmenting data for manageability and reassembling segmented data into streams of application data at the destination
3. Identifying the proper application for each communication stream

Question 2

What are the 2 transport layer protocols?

Answer 2

TCP and UDP

Question 3

reliable, full-featured transport layer protocol, which ensures that all of the data arrives at the destination

Answer 3

TCP

Question 4

very simple transport layer protocol that does not provide for any reliability.

Answer 4

UDP

Question 5

3 basic operation of reliability in TCP?

Answer 5

1. Tracking transmitted data segments
2. Acknowledging received data
3. Retransmitting any unacknowledged data

Question 6

What are the units that the TCP message breaks into smaller pieces called?

Answer 6

segments

Question 7

is known as a best-effort delivery protocol

Answer 7

UDP

Question 8

transport layer protocol that is a better choice for applications that can tolerate some data loss during transmission over the network, but delays in transmission are unacceptable

Answer 8

UDP

Question 9

TCP segment header Used for data reassembly purposes.

Answer 9

sequence number 32bits

Question 10

TCP segment header that Indicates the data that has been received.

Answer 10

Acknowledgement number 32bits

Question 11

Known as ʺdata offsetʺ. Indicates the length of the TCP segment header.

Answer 11

header length 4bits

Question 12

Field received for future use in a TCP header

Answer 12

Reserved 6bits

Question 13

includes bit codes, or flags, that indicate the purpose and function of the tcp segment header

Answer 13

control bits 6bits

Question 14

Indicates the number of segments that can be accepted at one time in a TCP segment header

Answer 14

window size 16bits

Question 15

used for error checking of the segment header and data in a tcp segment header

Answer 15

checksum 16bits

Question 16

TCP segment header that Indicates if data is urgent

Answer 16

Urgent 16bits

Question 17

What are the 4 udp header fields?

Answer 17

source, destination, length, checksum

Question 18

what 2 addresses make up a socket?

Answer 18

ip address and port number

Question 19

What ports are the well know ports?

Answer 19

0 to 1023

Question 20

what ports are the Registered ports

Answer 20

1024 to 49151

Question 21

what ports are the dynamic or private ports

Answer 21

49152 to 65535

Question 22

port used for ftp

Answer 22

21 tcp

Question 23

port used for telnet

Answer 23

23 tcp

Question 24

port used for smtp

Answer 24

25 tcp

Question 25

port used for https

Answer 25

443 tcp

Question 26

port used for internet relay chat

Answer 26

194 tcp

Question 27

port used for imap

Answer 27

143 tcp

Question 28

port used for http

Answer 28

80 tcp

Question 29

port used for tftp

Answer 29

69 udp

Question 30

port used for rip

Answer 30

520 udp

Question 31

port used for dns

Answer 31

53 tcp/udp

Question 32

port used for snmp

Answer 32

161 tcp/udp

Question 33

port used for aim/irc

Answer 33

531 tcp/udp

Question 34

what 5 things do the netstat command show?

Answer 34

protocol used, source port, address or name of remote host, destination port, connection state