A. Tcp
B. Udp
C. Dccp
D. Sctp
Explanation: Since TCP is a reliable protocol, it’s more efficient to use TCP protocol for e-mail transfer. TCP also provides more security than other transport layer protocols.
A. SMTPs
B. Ssmtp
C. Snmp
D. Starttls
Explanation: SSMTP is a simple mail transfer program to send mail from a local PC to a mail host. SNMP is a network management protocol. STARTTLS connections are secured by TLS.
A. 22
B. 23
C. 21
D. 25
Explanation: Port 21 is used for FTP control connection, port 22 is used by SSH, and port 23 is used by TELNET.
A. SMTP
B. Post office protocol (pop)
C. Internet message access protocol (imap)
D. FTP
Explanation: FTP is used to share files. SMTP, POP and IMAP are the protocols used to send and receive mails on the internet.
A. Protocol for smtp security
B. An smtp extension
C. Protocol for web pages
D. Protocol for faster mail transfer
Explanation: ODMR is an extension to SMTP, in which mails are relayed to the receivers after they are authenticated. It allows only the authorized receivers to receive the mail.
A. Ip address
B. Mac address
C. Url
D. Name
Explanation: The client needs to know the IP of its initial SMTP server as it has to send the mail first to that server and then the server forwards the mail ahead on behalf of the user.
A. Zero smtp transaction
B. One smtp transaction
C. More than one smtp transaction
D. One HTTP transaction
Explanation: An SMTP session can only include SMTP transactions regardless the number. Any other protocol’s transaction is not included in an SMTP session.
A. Message transport
B. Message encryption
C. Message content
D. Message password
Explanation: As the name suggests, Simple Mail Transfer Protocol is only responsible for “how” the message is transferred i.e. Transport of the message. Other protocols such as TCP are used to provide other services like encryption for the messages.
A. Open mail relay
B. Wide mail reception
C. Open mail reception
D. Short mail reception
Explanation: Anyone can send an e-mail through an Open Mail Relay server so it acted like a free relay for email agents to forward their mails through. Open Mail Relays are now unpopular because they can be used by attackers to perform man-in-the-middle attacks.
A. User’s terminal
B. User’s mailbox
C. User’s word processor
D. User’s email client
Explanation: SMTP can only be used to send messages to user’s terminal, email client or mailbox. A stand-alone word processor cannot be connected to a network, so it won’t be possible to deliver messages to it.