Correct Answer : Option (A) : PASS
Explanation : The PASS command, preceded by the username, completes the user’s identification for access control in an FTP session. Without the valid password, the user won’t be able to initiate the FTP connection.
Correct Answer : Option (C) : SMTP client
Explanation : SMTP clients are the entities that send mails to other mail servers. The SMTP servers cannot send independent mails to other SMTP servers as an SMTP server. There are no masters or peers in SMTP as it is based on the client-server architecture.
Correct Answer : Option (C) : Simple Mail Transfer Protocol
Explanation : SMTP or Simple Mail Transfer Protocol is an application layer protocol used to transport e-mails over the Internet. Only 7-bit ASCII codes can be sent using SMTP.
Correct Answer : Option (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 : Option (A) : One message
Explanation : It places all objects into one message as it wouldn’t be efficient enough if there are different messages for each object. The objects include the text and all the multimedia to be sent.
Correct Answer : Option (D) : 25
Explanation : The ports 15, 35 and 50 are all UDP ports and SMTP only uses TCP port 25 for reliability.
Correct Answer : Option (D) : 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 : Option (C) : 255 characters
Explanation : An entire hostname can have a maximum of 255 characters. Although each label must be from 1 to 63 characters long. Host name is actually a label that is given to a device in a network.
Correct Answer : Option (B) : DNS resolver
Explanation : DNS client also known as DNS resolver also known as DNS lookup helps to resolve DNS requests using an external DNS server.
Correct Answer : Option (D) : by contacting remote DNS server
Explanation : Whenever a request is received at server from other domains, it handles this situation by contacting remote DNS server.