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2.2.1.8 NFS
NFS
stands
for
Network
File
System.
A
distributed
file-sharing
system
developed
well
over a decade ago by Sun Microsystems, Inc. NFS allows a computer on a network to use
the
files
and
peripheral
devices
of
another
networked
computer
as
if
they
were
local,
subject
to
certain
security
restrictions.
Using
NFS,
you
can
share
files
on
your
system
with
other
computers
running
MS-DOS, MacOS, UNIX, Novell NetWare, VMS, and
many other operating systems, in both local and global environments [6].
2.2.2 Transport
Layer
Like its name, transport layer handle the transport of data from the
host to the destination
network.
Data
that
it
send
usually
called
datagram
(a
message
unit
that
contains
source
and destination address information, as well as the data itself, which is routed
through a
packet-switching network) [6]. The two important protocols
for this
layer are:
2.2.2.1 TCP
TCP
stands
for
Transmission
Control
Protocol.
TCP
is
the
transport- level protocol
used
in the TCP/IP suite of protocols. It works above IP in the protocol stack and provides
reliable
data
delivery
over
connection-oriented
links.
TCP
adds
a
header
to
the
datagram
that
contains
the
information
needed
to
get
the
datagram
to
its
destination.
The
source
port
number and the destination port
number allow data
to be
sent back and
forth to the
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