3Com AccessBuilder 500 User Manual page 81

Network
File Store
(NFS)
Hardware
Figure A-4 Open Systems Interconnection Network Layer Model
A routing environment allows stations to communicate indirectly.
Following the example in
wants to communicate with a network server on LAN 2. The station on
LAN 1, constructs a Layer 2 datalink header (see
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.
File
Transfer
Protocol
(FTP)
User Transmission
Database
Protocol
(UDP)
Internet Protocol (IP) and
Internet Control Message Protocol
(ICMP)
Link Level Control
Ethernet
Figure A-3, let us assume that a station on LAN 1
Routing IP and IPX
Telnet
Control
Protocol
(TCP)
ARP
RARP
Others
Figure A-5), with the
A-9