Rabu, 17 Oktober 2012
CHAPTER - 6
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?
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
