Information Technology Reference
In-Depth Information
Router B1-R2 Interface
Subnet Number
Subnet Address
Fa0/0
0
172.20.0.0/22
Fa0/1
1
172.20.4.0/22
Fa1/0
2
172.20.8.0/22
Fa1/1
3
172.20.12.0/22
Router B2-R2 Interface
Subnet Number
Subnet Address
Fa0/0
0
172.20.16.0/23
Fa0/1
1
172.20.18.0/23
Fa1/0
2
172.20.20.0/23
Fa1/1
3
172.20.22.0/23
Router B3-R2 Interface
Subnet Number
Subnet Address
Fa0/0
0
172.20.24.0/24
Fa0/1
1
172.20.25.0/24
Fa1/0
2
172.20.26.0/24
Fa1/1
3
172.20.27.0/24
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
172.20.255.240/30
B2-R2 <—> R2
1
172.20.255.244/30
B3-R2 <—> R2
2
172.20.255.248/30
Document the addressing scheme.
Step 2.
(Optional) In Figure 6-22, label each subnet. To save space, use only the last two
octets because only these octets change.
■
Use Table 6-16 for Region 1 and Table 6-17 for Region 2 to document the IP address-
es 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
perspective B1, B2, and B3 routers.
■
