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The Seventh Layer of the OSI Model
Transcript of The Seventh Layer of the OSI Model
A Brief History of the OSI Model
The concept of a seven-layer model was provided by the work of Charles Bachman, Honeywell Information Services
A gateway is a data communication device that provides a remote network with connectivity to a host network.
Generally, a router is configured to work as a gateway device in a computer networks
The application layer is the OSI layer closest to the end user, which means that both the OSI application layer and the user interact directly with the software application
Application-layer functions typically include identifying communication partners, determining resource availability, and synchronizing communication
■Utilize Telnet to connect to an application layer services by specifying the port that's used by the service.
Verify name resolution services, such as DNS and WINS are functioning properly.
Hyper Text Transfer Protocol (HTTP) HTTP allows computers to exchange files in various formats on the WWW through client software called a Web browser.
File Transfer Protocol (FTP) is a standard network protocol used to transfer files from one host to another host over TCP-based network, such as the Internet
Simple Mail Transfer Protocol is used for sending e-mail messages, typically across the Internet
The SMTP service uses TCP port 25 to send messages using SMTP
Simple Network Management Protocol (SNMP) provides a way to gather statistical and troubleshooting information about devices such as PCs, routers, switches, and hubs
Telnet is a TCP/IP-based service that allows users to log onto a computer from a remote location, run character-mode or command-line utilities on the remote computer or device, and view files on a remote device