module 11 Transport layer services

Question 1

Which layer of the TCP/IP model is responsible for ensuring packets are sent reliably and any missing packets are resent?

Answer 1

Transport layer

Question 2

True or False: The Transport Control Protocol (TCP) does not keep track of segments sent to the destination.

Answer 2

False

Question 3

True or False: The User Datagram Protocol (UDP) does not use acknowledgments to track the receipt of segments.

Answer 3

True

Question 4

Assume a host with IP address 10.1.1.10 wants to request web services from a server at 10.1.1.254. Which of the following would display the correct socket pair?

Answer 4

10.1.1.10(:1099) - 10.1.1.254(:80)

Question 5

Which port group includes port numbers for FTP, HTTP, and TFTP applications?

Answer 5

Well-known ports

Question 6

Which Windows command would display the protocols in use, the local address and port numbers, the foreign address and port numbers, and the connection state?

Answer 6

Netstat

Question 7

A client packet is received by a server. The packet has a destination port number of 21. What service is the client requesting?

Answer 7

FTP

Question 8

A client packet is received by a server. The packet has a destination port number of 22. What service is the client requesting?

Answer 8

SSh

Question 9

A client packet is received by a server. The packet has a destination port number of 67. What service is the client requesting?

Answer 9

DHCP

Question 10

A client packet is received by a server. The packet has a destination port number of 53. What service is the client requesting?

Answer 10

DNS

Question 11

A client packet is received by a server. The packet has a destination port number of 161. What service is the client requesting?

Answer 11

snmp

Question 12

A client packet is received by a server. The packet has a destination port number of 443. What service is the client requesting?

Answer 12

HTTPS

Question 13

A client packet is received by a server. The packet has a destination port number of 143. What service is the client requesting?

Answer 13

IMAP

Question 14

A client packet is received by a server. The packet has a destination port number of 110. What service is the client requesting?

Answer 14

POP3

Question 15

A client packet is received by a server. The packet has a destination port number of 69. What service is the client requesting?

Answer 15

TFTP

Question 16

A client packet is received by a server. The packet has a destination port number of 25. What service is the client requesting?

Answer 16

SMTP

Question 17

A client packet is received by a server. The packet has a destination port number of 110. What service is the client requesting?

Answer 17

pop3

Question 18

Why is UDP well suited as the transport layer protocol for video applications?

Answer 18

UDP has low Overhead

Question 19

Which transport layer information is added to both the TCP and UDP headers?

Answer 19

Port number

Question 20

What type of applications are best suited for using UDP?

Answer 20

application that are sensitive to delay

Question 21

What protocol header information is used at the transport layer to identify a target application?

Answer 21

Port Number

Question 22

A client device has initiated a secure HTTP request to a web browser. Which well-known port address number is associated with the destination address?

Answer 22

443

Question 23

What information is used by TCP to reassemble and reorder received segments?

Answer 23

Sequence Numbers

Question 24

What type of port number is assigned by IANA to commonly used services and applications?

Answer 24

Well-known port

Question 25

Which protocol operates at the transport layer of the TCP/IP model and ensures reliable delivery of IP packets?

Answer 25

TCP

Question 26

What is a characteristic of UDP?

Answer 26

it provide unreliable delivery of segment

Question 27

What is the well-known port address number used by DNS to serve requests?

Answer 27

53

Question 28

which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer?

Answer 28

the client randomly select a source port number