Part 1. Examine the Network Requirements

Step 1. Determine the number of subnets needed.

You will subnet the network address 172.31.103.0/24. The network has the following requirements:

SW-1 LAN will require[27] host IP addresses

SW-2 LAN will require[25]host IP addresses

SW-3 LAN will require[14] host IP addresses

SW-4 LAN will require[8] host IP addresses

Question:

How many subnets are needed in the network topology?

[5]

Step 2. Determine the subnet mask information for each subnet.

Questions:

a. Which subnet mask will accommodate the number of IP addresses required forSW-1?

[255.255.255.224] or [/27]

How many usable host addresses will this subnet support?

[30]

b. Which subnet mask will accommodate the number of IP addresses required forSW-2?

[255.255.255.224] or [/27]

How many usable host addresses will this subnet support?

[30]

c. Which subnet mask will accommodate the number of IP addresses required for SW-3?

[255.255.255.240] or [/28]

How many usable host addresses will this subnet support?

[14]

d. Which subnet mask will accommodate the number of IP addresses required forSW-4?

[255.255.255.248] or [/29]

How many usable host addresses will this subnet support?

[6]

e. Which subnet mask will accommodate the number of IP addresses required for the connection betweenBuilding-1 andBuilding-2?

[255.255.255.252] or [/30]

Part 2. Design the VLSM Addressing Scheme

Step 1. Divide the 172.31.103.0/24 network based on the number of hosts per subnet.

Now fill in the following summary table with the VLSM subnet information:

VLSM Summary Table:

Subnet Number	Subnet address/CIDR	Subnet Mask	First Usable Host Address	Broadcast Address	Usable Hosts
0	172.31.103.0	/27	172.31.103.1	172.31.301.31	30
1	172.31.103.32	/27	172.31.103.33	172.31.301.63	30
2	172.31.103.64	/28	172.31.103.65	172.31.103.79	14
3	172.31.103.80	/29	172.31.103.81	172.31.103.87	6
4	172.31.103.88	/30	172.31.103.87	172.31.103.91	2
5	[Type your answer here]	[Type your answer here]	[Type your answer here]	[Type your answer here]	[Type your answer here]
6	[Type your answer here]	[Type your answer here]	[Type your answer here]	[Type your answer here]	[Type your answer here]
7	[Type your answer here]	[Type your answer here]	[Type your answer here]	[Type your answer here]	[Type your answer here]
8	[Type your answer here]	[Type your answer here]	[Type your answer here]	[Type your answer here]	[Type your answer here]

Step 2. Document the VLSM subnets.

Complete the Subnet Table,listing the subnet descriptions, number of hosts needed, then network address for the subnet, the first usable host address, and the broadcast address. Repeat until all addresses are listed.

a. Use the first subnet to accommodate the largest LAN.

b. Use the second subnet to accommodate the second largest LAN.

c. Use the third subnet to accommodate the third largestLAN.

d. Use the fourth subnet to accommodate the fourth largestLAN.

e. Use the fifth subnet to accommodate the connection between Building-1and Building-2.

VLSM Subnet Table:

Subnet Description	Number of Hosts Needed	Network Address/CIDR	First Usable Host Address	Broadcast Address
Host-A LAN	27	172.31.103.0	172.31.103.1	172.31.301.31
Host-B LAN	25	172.31.103.32	172.31.103.33	172.31.301.63
Host-C LAN	14	172.31.103.64	172.31.103.65	172.31.103.79
Host-D LAN	8	172.31.103.80	172.31.103.81	172.31.103.87
WAN Link	2	172.31.103.88	172.31.103.87	172.31.103.91

Step 3. Document the addressing scheme.

a. Assign the first usable IP addresses to Building-1 for the two LAN links.

b. Assign the first usable IP addresses to Building-2 for the two LAN links.

c. Assign the IP addresses to the WAN link.

d. Assign the second usable IP addresses to the switches.

e. Assign the last usable IP addresses to the hosts.

Addressing Table:

Device	Interface	IP Address	Subnet Mask	Default Gateway
Building-1	G0/0	172.31.103.1	255.255.255.224	N/A
G0/1	172.31.103.33	255.255.255.224	N/A
S0/0/0	172.31.103.97	255.255.255.252	N/A
Building-2	G0/0	172.31.103.65	255.255.255.240	N/A
G0/1	172.31.103.81	255.255.255.248	N/A
S0/0/0	172.31.103.98	255.255.255.240	N/A
SW-1	VLAN 1	172.31.103.2	255.255.255.224	172.31.103.1
SW-2	VLAN 1	172.31.103.34	255.255.255.224	172.31.103.33
SW-3	VLAN 1	172.31.103.66	255.255.255.240	172.31.103.64
SW-4	VLAN 1	172.31.103.82	255.255.255.248	172.31.103.81
Host-A	NIC	172.31.103.30	255.255.255.224	172.31.103.1
Host-B	NIC	172.31.103.62	255.255.255.224	172.31.103.33
Host-C	NIC	172.31.103.78	255.255.255.240	172.31.103.65
Host-D	NIC	172.31.103.94	255.255.255.240	172.31.103.81

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Part 1. Examine the Network Requirements Step 1. Determine the number of subnets needed. You will subnet the network address 172.31.103.0/24. The network has the following requirements: ? SW-1 LAN will require[27] host IP addresses ? SW-2 LAN will require[25]host IP addresses ? SW-3 LAN will require[14] host IP addresses ? SW-4 LAN will require[8] host IP addresses Question: How many subnets are needed in the network topology? [5] Step 2. Determine the subnet mask information for each subnet. Questions: a. Which subnet mask will accommodate the number of IP addresses required forSW-1? [255.255.255.224] or [/27] How many usable host addresses will this subnet support? [30] b. Which subnet mask will accommodate the number of IP addresses required forSW-2? [255.255.255.224] or [/27] How many usable host addresses will this subnet support? [30] c. Which subnet mask will accommodate the number of IP addresses required for SW-3? [255.255.255.240] or [/28] How many usable host addresses will this subnet support? [14] d. Which subnet mask will accommodate the number of IP addresses required forSW-4? [255.255.255.248] or [/29] How many usable host addresses will this subnet support? [6] e. Which subnet mask will accommodate the number of IP addresses required for the connection betweenBuilding-1 andBuilding-2? [255.255.255.252] or [/30]