Chapter 6

1. Which port number is used by SMTP?

20

21

25

26

110

2. What three items are contained in an Ethernet header and trailer? (Choose three.)

source IP address

source MAC address

destination IP address

destination MAC address

error-checking information

3. What client software enables logged in users to communicate with other logged in users in real time?

blog

e-mail

web mail

instant messaging

4. A device receives an Ethernet frame and recognizes the MAC address as its own. What does the device do to the message to get to the encapsulated data?

removes the IP header

removes the TCP header

passes data to the application layer

removes the Ethernet header and trailer

5. Which protocol is used by FTP to transfer files over the Internet?

TCP

SMTP

UDP

SNMP

6. Cabling issues are associated with which OSI layer?

4

2

1

3

7. What is the correct order of the layers of the OSI reference model, starting at the lowest layer and working up the model?

data link, physical, transport, network, presentation, session, application

physical, data link, network, session, transport, presentation, application

physical, data link, network, transport, presentation, session, application

physical, data link, network, transport, session, presentation, application

application, session, presentation, transport, data link, network, physical

8. What resolves a website URL to an IP address?

FTP server

web server

DNS server

DHCP server

9. You are creating a network-based video game. What influences your decision about which transport protocol to use for the application?

UDP will not disrupt the game to retransmit dropped packets.

TCP provides extra acknowledgements that will ensure smooth video delivery.

Both TCP and UDP can be used simultaneously to ensure speed and guaranteed delivery.

Both TCP and UDP may slow transmission and disrupt game operation, so no transport protocol should be used.

10. An Internet server is running both FTP and HTTP services. How does the server know which of these applications should handle an incoming segment?

The packet header identifies it as an HTTP or FTP packet.

The data in the segment is specially formatted for either HTTP or FTP.

The segment destination port number identifies the application that should handle it.

The source port number is associated with one of these well known server applications.

11. What information is contained in an IP header?

source and destination IP addresses

source and destination MAC addresses

only destination IP and MAC addresses

both source and destination IP and MAC addresses

12. Whenever e-mail clients send letters, what device is used to translate the domain names into their associated IP addresses?

Uniform Resource Locator

Network redirector server

SNMP server

DNS server

13.

Refer to the graphic. Which protocol is used to access this website?

IM

FTP

HTTP

SNMP

VoIP

14. A client has decoded a frame and started the de-encapsulation process. In which order does the de-encapsulation process occur?

1) remove IP header
2) remove Ethernet header and trailer
3) remove TCP header
4) pass data to the application

1) add TCP header to data
2) add an IP header
3) add frame header and trailer
4) encode the frame into bits

1) remove Ethernet header and trailer
2) remove IP header
3) remove TCP header
4) pass data to the application

1) add TCP header to data
2) add Ethernet header and trailer
3) add an IP header
4) encode the frame into bits

15. Which application is most likely used to translate www.cisco.com to 198.133.219.25?

DHCP

DNS

FTP

HTTP

POP

SMTP

16. Which of the following are layers of the TCP/IP model? (Choose three.)

Application

Physical

Internet

Network Access

Presentation

17. What is an advantage of the use of layers in the OSI reference model?

It breaks network communications into larger parts.

It increases complexity.

It prevents changes in one layer from affecting other layers.

It requires the use of single-vendor equipment for hardware and software communications.

18. Which protocols are TCP/IP application layer protocols? (Choose two.)

UDP

FTP

IP

SMTP

TCP

19. What type of server would use IMAP?

DNS

DHCP

e-mail

FTP

Telnet

web

20. What term is used to describe how TCP/IP protocols are layered and interact to format, address, and transmit information across a network?

protocol hierarchy

protocol modeling

protocol stack

protocol layering

21. A network client in a corporate environment reboots. Which type of server would most likely be used first?

DNS

DHCP

e-mail

FTP

Telnet

web

22. Which protocol is used by e-mail servers to communicate with each other?

FTP

HTTP

TFTP

SMTP

POP

SNMP