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Routing IP and IPX
A-9
Figure A-4
Open Systems Interconnection Network Layer Model
A routing environment allows stations to communicate indirectly.
Following the example in
Figure A-3
, let us assume that a station on LAN 1
wants to communicate with a network server on LAN 2. The station on
LAN 1, constructs a
Layer 2
datalink header (see
Figure A-5
), with the
source station’s hardware address, and also the destination hardware
address of the local router. To direct the packet to its final network
destination, the source station must complete the
Layer 3
network header
with the destination network address of LAN 2.
Others
Ethernet
Hardware
Link Level Control
ARP
RARP
Internet Protocol (IP) and
Internet Control Message Protocol
(ICMP)
Transmission
Control
Protocol
(TCP)
Telnet
File
Transfer
Protocol
(FTP)
Network
File Store
(NFS)
User
Database
Protocol
(UDP)
PHYSICAL
DATA LINK
TRANSPORT
SESSION
PRESENTATION
APPLICATION
NETWORK