3.5.2 Lab – Subnetting Scenario 1 with Static Routing Answers
Topology
| Device | Interface | IP Address | Subnet Mask | Default Gateway |
|---|---|---|---|---|
| HQ | Fa0/0 | 192.168.9.193 | 255.255.255.224 | N/A |
| S0/0 | 192.168.9.129 | 255.255.255.224 | N/A | |
| S0/1 | 192.168.9.161 | 255.255.255.224 | N/A | |
| Branch 1 | Fa0/0 | 192.168.9.65 | 255.255.255.224 | N/A |
| Fa0/1 | 192.168.9.97 | 255.255.255.224 | N/A | |
| S0/0 | 192.168.9.158 | 255.255.255.224 | N/A | |
| Branch 2 | Fa0/0 | 192.168.9.33 | 255.255.255.224 | N/A |
| Fa0/1 | 192.168.9.1 | 255.255.255.224 | N/A | |
| S0/1 | 192.168.9.190 | 255.255.255.224 | N/A | |
| PC1 | NIC | 192.168.9.222 | 255.255.255.224 | 192.168.9.193 |
| PC2 | NIC | 192.168.9.126 | 255.255.255.224 | 192.168.9.97 |
| PC3 | NIC | 192.168.9.94 | 255.255.255.224 | 192.168.9.65 |
| PC4 | NIC | 192.168.9.62 | 255.255.255.224 | 192.168.9.33 |
| PC5 | NIC | 192.168.9.30 | 255.255.255.224 | 192.168.9.1 |
Learning Objectives:
- Determine the number of subnets needed.
- Determine the number of hosts needed.
- Design an appropriate addressing scheme.
- Assign addresses and subnet mask pairs to device interfaces and hosts.
- Examine the use of the available network address space.
- Determine how static routing could be applied to the network.
Scenario
In this lab, you have been given the network address 192.168.9.0/24 to subnet and provide the IP addressing for the network shown in the Topology Diagram. The network has the following addressing requirements:
- The Branch 1 LAN 1 will require 10 host IP addresses.
- The Branch 1 LAN 2 will require 10 host IP addresses.
- The Branch 2 LAN 1 will require 10 host IP addresses.
- The Branch 2 LAN 2 will require 10 host IP addresses.
- The HQ LAN will require 20 host IP addresses.
- The Link from HQ to Branch 1 will require an IP address for each end of the link.
- The Link from HQ to Branch 2 will require an IP address for each end of the link.
(Note: Remember that the interfaces of network devices are also host IP addresses and are included in the above addressing requirements.)
Task 1: Examine the Network Requirements.
Examine the network requirements and answer the questions below. Keep in mind that IP addresses will be needed for each of the LAN interfaces.
How many subnets are needed? ___7________
What is the maximum number of IP addresses that are needed for a single subnet? ____20_______
How many IP addresses are needed for each of the branch LANs? _____10_____
What is the total number of IP addresses that are needed? ___64______
Task 2: Design an IP Addressing Scheme.
Step 1 Subnet the 192.168.9.0 network into the appropriate number of subnets.
What will the subnet mask be for the subnetworks? __255.255.255.224 or /27____
How many usable host IP addresses are there per subnet? _30___
Fill in the following chart with the subnet information.
| Subnet Number | Subnet Address | First Usable Host Address | Last Usable Host Address | Broadcast Address |
|---|---|---|---|---|
| 0 | 192.168.9.0 | 192.168.9.1 | 192.168.9.30 | 192.168.9.31 |
| 1 | 192.168.9.32 | 192.168.9.33 | 192.168.9.62 | 192.168.9.63 |
| 2 | 192.168.9.64 | 192.168.9.65 | 192.168.9.94 | 192.168.9.95 |
| 3 | 192.168.9.96 | 192.168.9.97 | 192.168.9.126 | 192.168.9.127 |
| 4 | 192.168.9.128 | 192.168.9.129 | 192.168.9.158 | 192.168.9.159 |
| 5 | 192.168.9.160 | 192.168.9.161 | 192.168.9.190 | 192.168.9.191 |
| 6 | 192.168.9.192 | 192.168.9.193 | 192.168.9.222 | 192.168.9.223 |
| 7 | 192.168.9.224 | 192.168.9.225 | 192.168.9.254 | 192.168.9.255 |
Step 2 Assign the subnets to the network shown in the Topology Diagram.
When assigning the subnets, keep in mind that routing will need to occur to allow information to be sent throughout the network. The subnets will be assigned to the networks to allow for route summarization on each of the routers.
1. Assign first subnet (lowest subnet) to the LAN connected to the Fa0/1 interface of BRANCH2. What is the subnet address? ___192.168.9.0 /27_____
2. Assign second subnet to LAN connected to the Fa0/0 interface of BRANCH2. What is the subnet address? __192.168.9.32 /27_____
3. Assign third subnet to the WAN link from HQ to Branch2. What is the subnet address? ____192.168.9.64 /27______
4. Assign fourth subnet to the WAN link from HQ to BRANCH1. What is the subnet address? ___192.168.9.96 /27___
5. Assign fifth subnet to the LAN connected to the Fa0/0 interface of HQ. What is the subnet address? ___192.168.9.128 /27_____
6. Assign sixth subnet to the LAN connected to the Fa0/1 interface of BRANCH1. What is the subnet address? _____192.168.9.160 /27 _____
7. Assign seventh subnet to the LAN connected to the Fa0/0 interface of BRANCH1. What is the subnet address? ____192.168.9.192 /27____
Note: The highest subnet will not be required in this topology.
Task 3: Assign IP Addresses to the Network Devices.
Assign the appropriate addresses to the device interfaces. Document the addresses to be used in the table provided under the Topology Diagram.
Step 1 Assign addresses to the HQ router.
- Assign the first valid host address in the HQ LAN subnet to the LAN interface.
- Assign the first valid host address in Link from HQ to Branch 1 subnet to the S0/0 interface.
- Assign the first valid host address in Link from HQ to Branch 2 subnet to the S0/1 interface.
Step 2 Assign addresses to the Branch 1 router.
- Assign the first valid host address in the Branch 1 LAN 1 subnet to the Fa0/0 LAN interface.
- Assign the first valid host address in the Branch 1 LAN 2 subnet to the Fa0/1 LAN interface.
- Assign the last valid host address in Link from HQ to Branch 1 subnet to the WAN interface.
Step 3 Assign addresses to the Branch 2 router.
- Assign the first valid host address in the Branch 2 LAN 1 subnet to the Fa0/0 LAN interface.
- Assign the first valid host address in the Branch 2 LAN 2 subnet to the Fa0/1 LAN interface.
- Assign the last valid host address in Link from HQ to Branch 2 subnet to the WAN interface.
Step 4 Assign addresses to the host PCs.
- Assign the last valid host address in the HQ LAN subnet to PC1.
- Assign the last valid host address in the Branch 1 LAN 1 subnet to PC2.
- Assign the last valid host address in the Branch 1 LAN 2 subnet to PC3.
- Assign the last valid host address in the Branch 2 LAN 1 subnet to PC4.
- Assign the last valid host address in the Branch 2 LAN 2 subnet to PC5.
Task 4: Test the Network Design.
Apply your addressing scheme to the Packet Tracer file that has been supplied with this lab. Check to see that all devices on directly connected networks can ping each other.
Task 5: Reflection
How many IP address in the 192.168.9.0 network are unused or unusable in this design? ___192___
What would the command be to add a default static route on the WAN interface of the Branch 1 router?
ip route 0.0.0.0 0.0.0.0 serial 0/0
Can both of the Branch 1 LANs be summarized into one route on the HQ router?
yes
What would be the command used to add this summary route to the routing table? ip route
192.168.9.64 255.255.255.192 serial 0/0
Can both of the Branch 2 LANs be summarized into one route on the HQ router?
yes
What would be the command used to add this summary route to the routing table?
ip route 192.168.9.0 255.255.255.192 serial 0/1
Can the HQ LAN and both of the Branch 1 LANs be summarized into one route on the Branch 2 router?
yes
This summarized route should also include the link between the HQ and Branch 1 routers.
What would be the command used to add this summary route to the routing table?
ip route 192.168.9.0 255.255.255.128 serial 0/0
