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56 Chapter3
Planning Your Network
Network Worksheets
X.25 Internet Routing Table
The purpose of the X.25 internet routing table (Table 3-7) is to list the
other networks in the internetwork that can be reached from the X.25
network, which is NET3 in the example. (Note that there may be more
than one route to a network.)
As shown in the internetwork map (Figure 3-4), NET3 includes two
gateway nodes, B and H. In the X.25 internet routing table note that
NET3 nodes using Node H can reach NET5 in one hop, NET2 in two
hops, and so on. In the IP Node Address column, the node portion of the
node’s IP address is listed.
Table 3-6 X.25 Network Table
NETWORK NAME: NET3
IP NETWORK ADDRESS C 192.003.251 XXX
NODE NAME IP NODE ADDRESS CENTRAL ADMIN NODE
(Y/N)
X.25 ADDRESS
H 001 Y 1234
I 002 5678
J 003 6879
B 004 9876
Table 3-7 X.25 Internet Routing Table
NETWORK NAME: NET3
IP NETWORK ADDRESS C 192.003.251 XXX
GATEWAY IP NODE ADDRESS DESTINATION HOPS TO
DESTINATION
B 004 NET1 C 192.001.001 XXX 1
NET4 C 192.004.002 XXX 2
NET2 C 192.002.250 XXX 2
NET5 C 192.005.252 XXX 3
H 001 NET5 C 192.005.252 XXX 1
NET2 C 192.002.250 XXX 2
NET1 C 192.001.001 XXX 3
NET4 C 192.004.002 XXX 4