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2.1.6 Layer 2: Data-Link
Layer
Data
Link Layer
is an
important
layer,
it
ensure
message
that
send
by
the
sender
deliver
to the proper address within network topology. All messages that need to be transfer is
format into pieces called data frame, each data frame contain a header that load with
information
about
hardware
destination
and
source address. Data link layer also concern
with physical transmission, error notification, network topology and network access, and
flow
control.
Examples
of
this
protocol
are:
Ethernet
–
a
popular
network
protocol
and
cabling
scheme
with
a
transfer
rate
10Mbps,
originally
developed
at
Xerox
in
1970
by
Dr. Robert Metcalf [6] and Frame Relay –
a
CCIT
standard
for
a
packet-switching
protocol, running at speeds up to 2Mbps, that also provide bandwidth for demand [6].
2.1.7 Layer 1: Physical Layer
The
first
layer
of the OSI model, the physical layer, put its concern toward the way of
communication with the various types of the communication media. Physical layer help
setting up the protocol to communicate between different media. Different types of media
have their own protocol to communicate, some
use tones other represent
in bits. Physical
layer
needed
to
encode
data
into
media
signal
to
be
understandable,
most
of
the
media
can read signal.
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