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Question ID 14425

Which protocol uses a connection-oriented service to deliver files between end systems?

Option A

TFTP

Option B

 DNS

Option C

 FTP

Option D

SNMP

Option E

RIP

Correct Answer C
Explanation Explanation: TCP is an example of a connection-oriented protocol. It requires a logical connection to be established between the two processes before data is exchanged. The connection must be maintained during the entire time that communication is taking place, then released afterwards. The process is much like a telephone call, where a virtual circuit is established- -the caller must know the person's telephone number and the phone must be answered-- before the message can be delivered. TCP/IP is also a connection-oriented transport with orderly release. With orderly release, any data remaining in the buffer is sent before the connection is terminated. The release is accomplished in a three-way handshake between client and server processes. The connection-oriented protocols in the OSI protocol suite, on the other hand, do not support orderly release. Applications perform any handshake necessary for ensuring orderly release. Examples of services that use connection-oriented transport services are telnet, rlogin, and ftp.


Question ID 14426

Which layer of the TCP/IP stack combines the OSI model physical and data link layers?

Option A

 Internet layer

Option B

transport layer

Option C

application layer

Option D

network access layer

Option F

Answer : D

Explanation: The Internet Protocol Suite, TCP/IP, is a suite of protocols used for communication over the internet. The TCP/ IP model was created after the OSI 7 layer model for two major reasons. First, the foundation of the Internet was built using the TCP/IP suite and through the spread of the World Wide Web and Internet, TCP/IP has been preferred. Second, a project researched by the Department of Defense (DOD) consisted of creating the TCP/IP protocols. The DOD's goal was to bring international standards which could not be met by the OSI model. Since the DOD was the largest software consumer and they preferred the TCP/IP suite, most vendors used this model rather than the OSI. Below is a side by side comparison of the TCP/IP and OSI models.

Correct Answer D
Explanation

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