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Chapter 3 55
Planning Your Network
Network Worksheets
Figure 3-4 X.25 Network Map
X.25 Network Table
Refer to the X.25 network map to fill in the X.25 network table as
shown in Table 3-6. We complete the first column by listing the names
of all the nodes on NET3. Each node is assigned an IP address that is
unique within the network. Only the node portions of the IP addresses
are listed since the IP network address is listed at the top of the table.
In the third column of the table, node H is indicated as a central
administrative node. The X.25 (subnet) address for each node is listed
in the fifth column of the network table. The X.25 address is a decimal
number (up to 15 digits) identifying a node’s location on the X.25 subnet
for connections using switched virtual circuits (SVCs). Usually this
address is inserted in CALL packets to set up connections using SVCs.
If the network you will access is a public packet switching network
(PSN), these addresses (where appropriate) are recorded on the
network subscription form.
B
DTC
DTC
DTC
Central Admin
Node
NET1
NET3
C 192.003.251XXX
X.25
NET5
X.25 PSN
H
I
J