Application layer protocols are built on top of and ito the TCP/IP protocol suite and are available on most implementations. Some of application protocols have been discussed below:
File Transfer Protocol : It provides a mechanism for single or multiple file transfers between computer systems; when written in lower case as "ftp". The FTP package provides all the tools needed to look at files and directories, and transfer text and binary files from one system to another. FTP uses TCP to actually move files.
accessing files on remote machine:
Post Office Protocol (POP): It provides a storage mechanism for incoming mail, the latest version of the standard is known as POP3. When a client connects to a POP3 server, all the messages addressed to that client are downloaded; there is no way to download messages selectively.Once messages are downloaded, we can delete or modify without any interaction with server.
gmail e-mail pop server: pop.gmail.com (Port 995 with SSL)
yahoo e-mail pop server: pop.mail.yahoo.com
Internet Message Access Protocol (IMAP): It allows users to download mail selectively, look at the message header, download just a part of a message, store message on the e-mail server in a hierarchical structure, and link to documents.The current version of IMAP is version 4.
gmail e-mail imap server: imap.gmail.com (port 993 with ssl)
yahoo e-mail imap server : imap.mail.yahoo.com (port 993 with ssl).
Telnet: Telnet is a terminal emulation protocol that provides a remote logon to another host over the network. It allows a user to connect to a remote host over a TCP/IP connection as if they were sitting at that host. Keystroke typed into a Telnet program will be transmitted over a TCP/IP network to the host and the visual reponses are sent back by the host to the client's screen.
Hypertext Transfer Protocol (HTTP): HTTP is the command and control protocol used to manage communications between a web browser and a web server. HTTP is the mechanism that opens the related document when you select a link, no matter where that document is actually located. Secure version of HTTP is known as HTTPS.
Lightweight Directory Access Protocol (LDAP): In large network, most administrator have set uo some kind of directory that keeps track of users and resources. LDAP allows client to perform object lookups with a directory using a standard method.
File Transfer Protocol : It provides a mechanism for single or multiple file transfers between computer systems; when written in lower case as "ftp". The FTP package provides all the tools needed to look at files and directories, and transfer text and binary files from one system to another. FTP uses TCP to actually move files.
accessing files on remote machine:
- ftp machine_name(or machine address)
- FTP responds by asking login_name and password.
- once authentication is being done, it will prompt
- ftp>
- ftp> ? (help), "explore different commands by yourself".
Post Office Protocol (POP): It provides a storage mechanism for incoming mail, the latest version of the standard is known as POP3. When a client connects to a POP3 server, all the messages addressed to that client are downloaded; there is no way to download messages selectively.Once messages are downloaded, we can delete or modify without any interaction with server.
gmail e-mail pop server: pop.gmail.com (Port 995 with SSL)
yahoo e-mail pop server: pop.mail.yahoo.com
Internet Message Access Protocol (IMAP): It allows users to download mail selectively, look at the message header, download just a part of a message, store message on the e-mail server in a hierarchical structure, and link to documents.The current version of IMAP is version 4.
gmail e-mail imap server: imap.gmail.com (port 993 with ssl)
yahoo e-mail imap server : imap.mail.yahoo.com (port 993 with ssl).
Telnet: Telnet is a terminal emulation protocol that provides a remote logon to another host over the network. It allows a user to connect to a remote host over a TCP/IP connection as if they were sitting at that host. Keystroke typed into a Telnet program will be transmitted over a TCP/IP network to the host and the visual reponses are sent back by the host to the client's screen.
Hypertext Transfer Protocol (HTTP): HTTP is the command and control protocol used to manage communications between a web browser and a web server. HTTP is the mechanism that opens the related document when you select a link, no matter where that document is actually located. Secure version of HTTP is known as HTTPS.
Lightweight Directory Access Protocol (LDAP): In large network, most administrator have set uo some kind of directory that keeps track of users and resources. LDAP allows client to perform object lookups with a directory using a standard method.
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