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2.1.4 Layer 4: Transport Layer
The
Transport
layer
reassembles
data
into
a
data
stream,
data
that
being
reassembled
came
from
the
upper
layer
application.
Transport
layer
focused
with
end-to-end
connection.
Reliability
of
transport
between
host
become
main
concern
for
this
layer,
when
transporting
data
between
host
the
upper- layer
is
shield
to
protect
the
transport-
implementation details by providing transparent data transfer. Examples for this protocol
are:
TCP,
UDP,
and
Sequence
Packet
Exchange
–
a set of Novell NetWare protocol
implemented on top of IPX (SPX) [6].
2.1.5 Layer 3: Network Layer
The network layer protocol concern about device addressing, in order to provide reliable
connectivity
between
hosts
the
device
addressing
within
geographically
separated
network
must
be
determined
first.
When
device
addressing
in
network
region
already
been
determined,
all
device
can
be
easily
keep
track.
Two
types
of
packet
used
in
this
layer are data and
route
update.
Routers
usually
used to provides routing service within
an
internetworking. Examples
for this protocol are:
IP and Internetwork Packet Exchange
–
Part of Novell NetWare’s native protocol stack, used to transfer data between the server
and workstation on the network (IPX) [6].
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