POP
Smtp,pop3
TCP (CISCO CCNA - 3.2.1.3 Interaction of Protocols)
No. The POP3 protocol is a network protocol. It is only concerned with the messages sent back and forth between the mail server and the mail client. The internal format of the mailbox files on the server is only of concern to the POP3 server software. It needs to be able to read the mailbox files so it can send the proper messages to the POP3 client in order to transfer the email. HTH, Gdunge
TELNET operates at Application Layer in TCP/IP Model. It's an Application to establish a connection to TCP Port Number 23, where a Telnet server application (telnetd) is listening.
Most email clients use one of three protocols to receive an email message. They are SMTP (Simple Mail Transfer Protocol), POP (Post Office Protocol), or IMAP (Internet Message Access Protocol).
== == The basic difference between a web server and an application server is Webserver can execute only web applications i,e servlets and JSPs and has only a single container known as Web container which is used to interpret/execute web applications Application server can execute Enterprise application, i,e (servlets, jsps, and EJBs) it is having two containers 1. Web Container(for interpreting/executing servlets and jsps) 2. EJB container(for executing EJBs). it can perform operations like load balancing , transaction demarcation etc etc
Workstations interact with the SMTP host, which receives the mail on behalf of every host in the organization, to retrieve messages by using a client-server protocol such as Post Office Protocol, version 3(POP3). Although POP3 is used to download messages from the server, the SMTP client still needed on the desktop to forward messages from the workstation user to its SMTP mail server.
POP (post office protocol) is usually used to retreive emails from a server.
POP (Post Office Protocol) - The protocol that an e-mail server and client usewhen the client requests the downloading of e-mailmessages.
POP is Post Office Protocol. It is a protocol used by email clients to retrieve emails from a remote server.
If the client doesn't know the IP address of the desired web server it has to find that out. This can be done via DNS if you know the name of the server as part of the URL. After the address is located then transfer takes place using HTTP protocol. This is a layer 7 (application layer) protocol.
Post Office Protocol version 3 (POP3) is a protocol used by email clients to retrieve emails from a mail server. It operates on port 110 and typically downloads emails from the server to the client's device.
File Transfer Protocol
RDP
Along with POP3, IMAP is one of two prevailing electronic mail protocols. IMAP is an acronym for Internet Message Access Protocol. It is is an Application Layer Internet protocol, meaning that it allows an e-mail client application to access electronic mail on a remote mail server. IMAP differs from the other prevailing e-mail protocol, POP3, in that the client's e-mail is retained in a set of private message directories on the IMAP mail server itself. This allows messages to be easily synchronized across multiple e-mail clients on multiple devices. POP3 protocol delivers messages to the client application for storage on the client device. Messages are subsequently deleted from the POP3 server, making synchronization of multiple devices more difficult. POP3 was the preferred e-mail protocol when server power and storage capacity were at a premium, and before the rise of ubiquitous Internet-enabled mobile devices. More recently, IMAP has supplanted POP3 as the most predominant e-mail protocol. All web-mail services (GMail, Yahoo Mail, Hotmail, etc.) are based on IMAP. Microsoft Exchange is also a form of IMAP. Today, nearly all Internet and private electronic mail servers support IMAP.
A computer that stores and distributes newsgroup messages is called a news server or NNTP server. (NNTP, or Network News Transfer Protocol, supports the handling of newsgroups and their content.)
pop & imap
TELNET Application layer services like Network Virtual Terminal are used to realise this. TELNET is the protocol used. Refer - Data Communication and Networking by Forouzan