RIPv2 - Routing Protocols and Concepts - page 309

10.1.16.0/21 belongs to which classful network?

10.0.0.0/8

Using the address space 10.1.16.0/21, create subnets for the LANs. All LANs except for the Fa0/1
LAN on HQ need enough address space for 150 hosts. Starting with the Fa0/0 LAN attached to B1,
begin assigning subnets. Use Table 7-1 to document your subnets.

Table 7-1 LAN Subnets for 150 Hosts

Subnet No. Assign To Subnet Address Subnet Mast

0 B1 LAN1 10.1.16.0 255.255.255.0

1 B1 LAN2 10.1.17.0 255.255.255.0

2 B2 LAN1 10.1.18.0 255.255.255.0

3 B2 LAN2 10.1.19.0 255.255.255.0

4 B3 LAN1 10.1.20.0 255.255.255.0

5 B3 LAN2 10.1.21.0 255.255.255.0

6 HQ LAN1 10.1.22.0 255.255.255.0

LAN2 attached to HQ only needs 100 hosts. What subnet is still available to create the remaining sub-
net for LAN2 attached to HQ and the WAN links between HQ and the Branch routers? 10.1.23.0/24

Subnet this remaining subnet to provide enough addresses for LAN2 attached to HQ. Assign subnet 0.
What is the subnet? 10.1.23.0/25

Using CIDR notation, label the LANs in the topology shown earlier in Figure 7-1 with the subnet
address and subnet mask.

WAN Subnets

For the WAN links, you have been assigned the 172.16.1.0/28 address space. Answer the following
questions and fill in the subnets in Table 7-2.

172.16.1.0/28 belongs to which classful network? 172.16.0.0/16

Using the 172.16.1.0/28 address space, create subnets for the WANs between HQ and the Branch
routers. Use Table 7-2 to document your WAN subnets.

Table 7-2 WAN Subnets Between HQ and Branch Routers

Subnet No. Assign To Subnet Address Subnet Mast

0 B1/HQ WAN 172.16.1.0 255.255.255.252

1 B2/HQ WAN 172.16.1.8 255.255.255.252

2 B3/HQ WAN 172.16.1.8 255.255.255.252

Using CIDR notation, label the WANs in the topology shown earlier in Figure 7-1 with the subnet
address and subnet mask.