Information Technology Reference
In-Depth Information
Router B1-R2 Interface
Subnet Number
Subnet Address
Fa0/0
0
172.20.0.0/24
Fa0/1
1
172.20.1.0/24
Fa1/0
2
172.20.2.0/24
Fa1/1
3
172.20.3.0/24
Router B2-R2 Interface
Subnet Number
Subnet Address
Fa0/0
0
172.20.4.0/25
Fa0/1
1
172.20.4.128/25
Fa1/0
2
172.20.5.0/25
Fa1/1
3
172.20.5.128/25
Router B3-R2 Interface
Subnet Number
Subnet Address
Fa0/0
0
172.20.6.0/26
Fa0/1
1
172.20.6.64/26
Fa1/0
2
172.20.6.128/26
Fa1/1
3
172.20.6.192/26
For the WANs in Region 2, subnet the address space 172.20.255.240/28. Record the
subnets in the following table.
■
Router
Subnet Number
Subnet Address
B1-R2 <—> R2
0
172.20.8.0/30
B2-R2 <—> R2
1
172.20.8.4/30
B3-R2 <—> R2
2
172.20.8.8/30
Document the addressing scheme.
Step 2.
(Optional) On the topology shown in Figure 8-6, label each subnet. To save space, use
only the last two octets because only these octets change.
■
Use Table 8-7 to document the IP addresses and subnet masks. Assign the first IP
address to the router interface.
■
For the WAN links, assign the first IP address to R1 and R2 for links to each router's
respective B1, B2, and B3 routers.
■