Computer Networks — Test 19

Correct Answer: B. B. Rcpt to
Explanation: RCPT TO command is followed by the recipient’s mail address to specify where or to whom the mail is going to through the internet. If there is more than one receiver, the command is repeated for each address continually.

Correct Answer: A. A. Tcp
Explanation: TCP is a reliable protocol, and Reliability is a mandatory requirement in e-mail transmission using SMTP.

Correct Answer: B. B. It is a pull protocol
Explanation: In SMTP, the sending mail server pushes the mail to receiving mail server hence it is push protocol. In a pull protocol such as HTTP, the receiver pulls the resource from the sending server.

Correct Answer: A. A. 25
Explanation: The ports 15, 35 and 50 are all UDP ports and SMTP only uses TCP port 25 for reliability.

Correct Answer: A. A. Zero or more smtp transactions
Explanation: An SMTP session consists of SMTP transactions only even if no transactions have been performed. But no transactions in the session might mean that the session is inactive or is just initiated.

Correct Answer: A. A. Microsoft outlook
Explanation: Among the options, only Microsoft Outlook is an e-mail agent. Google is a search engine and Facebook, and Tumblr are social networking platforms. Gmail and Alpine are some other examples of e-mail agent.

Correct Answer: D. D. Two uas and two mtas
Explanation: The sender’s User Agent (UA) submits the message to a Message Transfer Agent (MTA). Then the MTA sends the message to another MTA i.e. a mail relay. Then the receiver receives the message from the mail relay whenever it is available.

Correct Answer: D. D. Routing messages
Explanation: The user agent is basically a software program that allows the user to send, and receive e-mail messages. Routing of the message is done by the Message Transfer Agent.

Correct Answer: D. D. All of the mentioned
Explanation: SAN management, data protection and disk operation are the main components of the Storage Management Initiative Specification. SMI-S was developed by the Storage Networking Industry Association.

Correct Answer: A. A. Snmp
Explanation: Simple Network Management Protocol is used for storage management. Lightweight Directory Access Protocol is used to access or locate information about directories and other resources on a network. Post Office Protocol 3 is used for e-mailing on the internet. Management Information Base is a part of SNMP and contains hierarchically organized information.