1. What is the correct order of the layers of the OSI reference model, starting at the lowest layer and working up the model?
>physical, data link, network, transport, session, presentation, application
   
2. What three items are contained in an Ethernet header and trailer? (Choose three.)
>source MAC address
>destination MAC address
>error-checking information


3. Which protocols are TCP/IP application layer protocols? (Choose two.)
>FTP
>SMTP
    
4. 

    
Refer to the graphic. Which protocol is used to access this website?
>HTTP
    
5. What is an advantage of the use of layers in the OSI reference model?
>It prevents changes in one layer from affecting other layers.


6. What term is used to describe how TCP/IP protocols are layered and interact to format, address, and transmit information across a network?
>protocol stack
    
7. Whenever e-mail clients send letters, what device is used to translate the domain names into their associated IP addresses?
>DNS server


8. 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 segment destination port number identifies the application that should handle it.
    
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.
    
10. Which port number is used by SMTP?
>25
    
11. Which application is most likely used to translate www.cisco.com to 198.133.219.25?
>DNS
    
12. Which of the following are layers of the TCP/IP model? (Choose three.)
>Application
>Internet
>Network Access
    
13. Which protocol is used by e-mail servers to communicate with each other?
>SMTP
    
14. What client software enables logged in users to communicate with other logged in users in real time?
>instant messaging


15. What type of server would use IMAP?
>e-mail


16. What resolves a website URL to an IP address?
>DNS server
    
17. What information is contained in an IP header?
>source and destination IP addresses
    
18. Which protocol is used by FTP to transfer files over the Internet?
>TCP
    
19. A client has decoded a frame and started the de-encapsulation process. In which order does the de-encapsulation process occur?
    
    1) remove Ethernet header and trailer
    2) remove IP header
    3) remove TCP header
    4) pass data to the application


20. 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 Ethernet header and trailer


21. Cabling issues are associated with which OSI layer?
>1
    
22. A network client in a corporate environment reboots. Which type of server would most likely be used first?
>DNS

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