10
compression and translation service. Example data format for the presentation layer are:
GIF,
JPEG,
MPEG,
TIFF,
American
Standard
Code
for
Information
Interchange
–
a
standard coding scheme that assigns numeric values to letters, numbers, punctuation
characters and control characters to achieve compatibility among different computer
peripheral devices (ASCII) [6], and MIDI.
2.1.3 Layer 5: Session Layer
Session Layer manages all the session needed to establish communication between hosts.
Consider to be the most difficult
layer to
understand.
Establish, terminates, and
manages
session
is
the
main
function
of
this
layer
beside
dialog
control
between
nodes.
Session
layer also organize communication between systems by providing three different
methods:
simplex,
half duplex,
and
full
duplex.
Common
application
or
protocol
uses
in
this
layer
are:
NetBIOS
–
a
Novell NetWare 3.x
workstation
utility
used to determine
if
the client software NETBIOS.EXE is loaded and, if so, which interrupts it is using [6],
Lightweight
Dir ectory
Access
Protocol
–
a
directory
services
that
can
help
people
find
other people and network services and can also be used over the Internet (LDAP) [6], X-
Window – an open and
nonproprietary bit- mapped
graphics
system, design
to be
independent of both the
display
hardware
and
the
underlying
operating
system
[6],
and
AppleTalk – an Apple
Macintosh
network protocol, based on
the OSI Reference Model,
which gives every Macintosh networking capabilities [6].
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