|
The application layer of the TCP/IP model
handles high-level protocols, issues of representation, encoding, and
dialog control. The TCP/IP protocol suite combines all application
related issues into one layer and assures this data is properly
packaged before passing it on to the next layer. TCP/IP includes not
only Internet and transport layer specifications, such as IP and TCP,
but also specifications for common applications. TCP/IP has protocols
to support file transfer, e-mail, and remote login, in addition to the
following applications:
- File Transfer Protocol (FTP)
– FTP is
a reliable, connection-oriented service that uses TCP to transfer
files between systems that support FTP. It supports bi-directional
binary file and ASCII file transfers.
- Trivial File Transfer Protocol (TFTP)
– TFTP is a connectionless service that uses the User Datagram
Protocol (UDP). TFTP is used on the router to transfer configuration
files and Cisco IOS images, and to transfer files between systems
that support TFTP. It is useful in some LANs because it operates
faster than FTP in a stable environment.
- Network File System (NFS) –
NFS is a distributed file system protocol suite developed by Sun
Microsystems that allows file access to a remote storage device such
as a hard disk across a network.
- Simple Mail Transfer Protocol
(SMTP) – SMTP administers the transmission of e-mail over computer
networks. It does not provide support for transmission of data other
than plaintext.
- Terminal emulation (Telnet) – Telnet
provides the capability to remotely access another computer. It
enables a user to log in to an Internet host and execute commands. A
Telnet client is referred to as a local host. A Telnet server is
referred to as a remote host.
- Simple Network Management Protocol
(SNMP) – SNMP is a protocol that provides a way to monitor and
control network devices, and to manage configurations, statistics
collection, performance, and security.
- Domain Name System (DNS) – DNS is a
system used on the Internet for translating names of domains and
their publicly advertised network nodes into IP addresses.
| |
Interactive Media Activity
Drag and Drop: The Application Layer
After completing this activity, the student will
be able to identify the protocols used in the application layer.
|
|
|
|
Web Links