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Once the packet is received by the Router A, attached to LAN 1, it strips
off the network header (refer to
Figure A-5
) and examines the Layer 3
datalink header information. It then reviews its routing tables in order
to establish where to forward the data packet. It is possible that the
LAN 1 router has multiple outgoing ports that would allow different
transmission routes to the destination network. In our example using
Figure A-3
, a packet could go via Router D to get to Router B, or it
could go more directly across a single direct link between Router A and
Router B.
Figure A-5
Data Packet Containing Hardware And Software Addresses
IP Routing
The local router contains, within its routing table, information which
will allow it to determine the best data transmission route. The type of
information the router uses to make these assessments is protocol
dependent, and some communications protocols may employ a range
of routing algorithms, and accompanying routing protocols. In the case
of the TCP/IP protocol suite, the AccessBuilder 500 utilizes the Routing
Information Protocol (RIP). RIP is also known as a
distance vector
protocol.