Question

Variable Length Subnet Mask (VLSM) and basic IP Address Design

Question 1:                                                                                                                                   [40 Marks]

1. With an IP address 172.16.1.0/24, provide for a networking scheme that has 6 point-to-point routing connections, and 7 LANs. LANs are distributed in a minimum of 1 LAN per router. Three LANs have a maximum of 6 hosts each. The rest have LANs each with a maximum of 30 hosts.

                                                                                                                                                                            [15]

2. Create an address table that shows proposed equipment, connections, their interfaces and

            addresses. Use a suitable table from the VLSM lecture series.                                                                                                         [10]

3. Explain briefly what your naming conventions are for the LANs and interfaces in your topology. [5]

4. Construct a topology of this networking scheme, labelling the gateway addresses, and point-to point interfaces.          [10]  

Note:    You may design your topology as you find suitable; however, endeavor to keep the number of routers to a maximum of 5.

Answer 1

Your subnets need 126 hosts.

Name	Hosts Needed	Hosts Available	Unused Hosts	Network Address	Slash	Mask	Usable Range	Broadcast
LAN1	30	30	0	172.16.1.0	/27	255.255.255.224	172.16.1.1 - 172.16.1.30	172.16.1.31
LAN2	30	30	0	172.16.1.32	/27	255.255.255.224	172.16.1.33 - 172.16.1.62	172.16.1.63
LAN3	30	30	0	172.16.1.64	/27	255.255.255.224	172.16.1.65 - 172.16.1.94	172.16.1.95
LAN4	6	6	0	172.16.1.96	/29	255.255.255.248	172.16.1.97 - 172.16.1.102	172.16.1.103
LAN5	6	6	0	172.16.1.104	/29	255.255.255.248	172.16.1.105 - 172.16.1.110	172.16.1.111
LAN6	6	6	0	172.16.1.112	/29	255.255.255.248	172.16.1.113 - 172.16.1.118	172.16.1.119
LAN7	6	6	0	172.16.1.120	/29	255.255.255.248	172.16.1.121 - 172.16.1.126	172.16.1.127
point-to-point1	2	2	0	172.16.1.128	/30	255.255.255.252	172.16.1.129 - 172.16.1.130	172.16.1.131
point-to-point2	2	2	0	172.16.1.132	/30	255.255.255.252	172.16.1.133 - 172.16.1.134	172.16.1.135
point-to-point3	2	2	0	172.16.1.136	/30	255.255.255.252	172.16.1.137 - 172.16.1.138	172.16.1.139
point-to-point4	2	2	0	172.16.1.140	/30	255.255.255.252	172.16.1.141 - 172.16.1.142	172.16.1.143
point-to-point5	2	2	0	172.16.1.144	/30	255.255.255.252	172.16.1.145 - 172.16.1.146	172.16.1.147
point-to-point6	2	2	0	172.16.1.148	/30	255.255.255.252	172.16.1.149 - 172.16.1.150	172.16.1.151

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