Describe the operation of data networks

These questions are based on 642-822 – Interconnecting Cisco Networking Devices Part 1.


Objective: Describe the operation of data networks
Sub-Objective: Describe common networking applications, including Web applications


Single Answer, Multiple Choice


Which of these applications uses the IMAP protocol to transfer information between a server and a host?



  1. E-mail
  2. FTP
  3. Web browser
  4. Telnet

Answer:
A. E-mail


Tutorial:
E-mail applications use Internet Message Access Protocol (IMAP) to retrieve messages from the mail servers. IMAP differs from Post Office Protocol (POP) in that IMAP does not download e-mail messages to client machines. By default, IMAP uses Transmission Control Protocol (TCP) to connect to the client. E-mail allows network users to communicate information and exchange data in an efficient and timely manner, and can also be used to communicate with users outside the network. It is known as the store and forward method of sending and receiving messages with the help of an electronic communication system. Some common e-mail applications include Microsoft Outlook and Outlook Express.


File Transfer Protocol (FTP) uses TCP, not IMAP, to transfer bulky data files from an FTP server to a client computer over the Internet or intranet. By default, FTP uses TCP port 21 to connect to the client system.


A Web browser uses Hyper Text Transmission Control Protocol (HTTP) to exchange information over the Internet. A Web browser provides access to the Internet through which a user can access text, images and other information on a Web site. By default, HTTP uses TCP port 80 to connect to the client computer.


Telnet uses TCP port 23 to connect to the client computer. You can use Telnet to remotely access a computer.


Reference:
IBM Internet Security Systems > Security Center > advICE > Exploits > Port Knowledgebase

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