| Layer 5 - The Session Layer The Session layer is responsible for setting up, managing and then tearing
down sessions between Presentation layer entities. The Session layer also
provides dialog control between devices, or nodes. It coordinates communication
between systems and serves to organise their communication by offering
three different modes: simplex,
half-duplex
and full-duplex.
The session layer basically keeps one application's data separate
from other application's data. Some examples of Session-layer protocols are: Network File Systrem (NFS) : Was developed by Sun Microsystems and used
with TCP/IP and Unix workstations to allow transparent access to remote
resources. Structured Query Language (SQL): Was developed by IBM to provide users
with a simpler way to define their information requirements on both local
and remote systems. Remote Procedure Call (RPC): Is a broad client/server redirection tool
used for disparate service environments. Its procedures are created on
clients and performed on servers. X Window: Is widely used by intelligent terminals for communicating with
remote Unix computers, allowing them to operate as though they were locally
attached monitors.
Next - OSI Layer 6 |
