Information Technology Reference
In-Depth Information
Task 1: Subnet the Address Space
Examine the network requirements.
Step 1.
The addressing for the network has the following requirements:
The 172.20.0.0/16 network must be subnetted to provide addresses for the LANs and
serial links:
■
The HQ LAN will require 8000 addresses
■
The Branch1 LAN will require 4000 addresses
■
The Branch2 LAN will require 2000 addresses
■
The links between the routers will require two addresses for each link
■
The loopback address representing the link between the HQ router and the ISP will
use the 10.10.10.0/30 network.
■
Consider the following questions when creating your network design.
Step 2.
How many subnets need to be created from the 172.20.0.0/16 network?
6
How many total IP addresses are required from the 172.16.0.0/16 network?
14006
What subnet mask will be used for the HQ LAN subnet?
255.255.224.0 or /19
What is the maximum number of host addresses that could be used on this subnet?
8190
What subnet mask will be used for the Branch1 LAN subnet?
255.255.240.0 or /20
What is the maximum number of host addresses that could be used on this subnet?
4094
What subnet mask will be used for the Branch2 LAN subnet?
255.255.248.0 or /21
What is the maximum number of host addresses that could be used on this subnet?
2046
What subnet mask will be used for the links between the three routers?
255.255.255.252 or /30
What is the maximum number of host addresses that could be used on each of these sub-
nets?
2
Assign subnetwork addresses to the topology diagram in Figure 11-13.
Step 3.
Assign subnet 0 of the 172.20.0.0/16 network to the HQ LAN subnet. What is the net-
work address of this subnet?
172.20.0.0/19
■
Assign the next available address space of the 172.20.0.0/16 network to the Branch1
LAN subnet. What is the network address of this subnet?
172.20.32.0/20
■
Assign the next available address space of the 172.20.0.0/16 network to the Branch2
LAN subnet. What is the network address of this subnet?
172.20.48.0/21
■
Assign the next available address space of the 172.20.0.0/16 network to the link
between the HQ and Branch1 routers. What is the network address of this subnet?
172.20.56.0 /30
■
Assign the next available address space of the 172.20.0.0/16 network to the link
between the HQ and Branch2 routers. What is the network address of this subnet?
172.20.56.4 /30
■
