The correct answer is A. SMTP (Simple Mail Transfer Protocol) is a standard Internet protocol for electronic mail (email) transmission. SMTP is an application-layer protocol that, together with the Post Office Protocol (POP) and Internet Message Access Protocol (IMAP), is one of the three main protocols of the Simple Mail Transfer Protocol (SMTP) family. SMTP is used to send email messages from one server to another. The SMTP server is responsible for accepting email messages from users and then forwarding them to the recipient’s email server.
B. FTP (File Transfer Protocol) is a standard network protocol used to transfer files from one host to another host over a TCP/IP network. FTP is a client-server protocol, which means that there are two programs involved in the transfer: a client program on the user’s computer and a server program on the remote computer. The client program initiates the connection and requests a file transfer from the server. The server program then sends the file to the client program.
C. TELNET is a standard network protocol that allows a user to log in to a remote computer and interact with it as if they were sitting at the console of that computer. TELNET is a text-based protocol, which means that all communication between the client and server is in the form of text.
D. SNMP (Simple Network Management Protocol) is a standard network protocol that allows network administrators to monitor and manage network devices. SNMP is a management protocol, which means that it is used to control and configure network devices. SNMP is a client-server protocol, which means that there are two programs involved in the management: a client program on the network administrator’s computer and a server program on the network device. The client program initiates the connection and requests information from the server program. The server program then sends the information to the client program.
E. None of these.