Information Technology Reference
In-Depth Information
23.11 Example network
A university network is shown in Figure 23.11. The connection to the outside global Internet
is via the Janet gateway node and its IP address is 146.176.1.3 . Three subnets,
146.176.160 , 146.176.129 and 146.176.151 , connect the gateway to departmental
bridges. The Computer Studies bridge address is 146.176.160.1 and the Electrical De-
partment bridge has an address 146.176.151.254 .
The Electrical Department bridge links, through other bridges, to the subnets
146.176.144 , 146.176.145 , 146.176.147 , 146.176.150 and 146.176.151 . The
main bridge (Figure 23.12) into the department connects to two Ethernet networks of PCs
(subnets 146.176.150 and 146.176.151 ) and to another bridge ( Bridge 1 ). Bridge 1
connects to the subnet 146.176.144 . Subnet 146.176.144 connects to workstations and
X-terminals. It also connects to the gateway Moon that links the Token Ring subnet
146.176.145 with the Ethernet subnet 146.176.144 . The gateway Oberon , on the
146.176.145 subnet, connects to an Ethernet link 146.176.146 . This then connects to the
gateway Dione that is also connected to the Token Ring subnet 146.176.147 .
The topology of the Electrical Department network is shown in Figure 23.12. Each node
on the network is assigned an IP address. The hosts file for the set-up in Figure 23.12 is
shown next. For example the IP address of Mimas is 146.176.145.21 and for miranda it
is 146.176.144.14 . Notice that the gateway nodes, Oberon , Moon and Dione , all have
two IP addresses.
Computer
Studies
bridge
146.176.160.1
Global
Internet
146.176.160
Mechanical
Department
bridge
146.176.129.1
146.176
Janet
gateway
146.176.1.3
146.176.129
146.176.151
146.176.144
146.176.145
Electrical
Department
bridge
146.176.147
146.176.150
146.176.151
146.176.151.254
Figure 23.11
A university network
Contents of host file
146.176.1.3 janet
146.176.144.10 hp
146.176.145.21 mimas
146.176.144.11 mwave
146.176.144.13 vax
146.176.144.14 miranda
146.176.144.20
triton
146.176.146.23
oberon
146.176.145.23
oberon
146.176.145.24
moon
 
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