# Lab Calculating VLSM Subnets

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1 Lab Calculating VLSM Subnets Objective Use variable-length subnet mask (VLSM) to support more efficient use of the assigned IP addresses and to reduce the amount of routing information at the top level. The solution to this VLSM lab is provided in the steps themselves. Students should take the recommended subnetting in each step and build a diagram of the network, showing routers, LANs and WAN links. Each LAN and WAN link should be labeled with the appropriate subnet address and slash number. A suggested diagram can be found at the end of this lab. Background/Preparation A class C address of /24 has been allocated. Perth, Sydney, and Singapore have a WAN connection to Kuala Lumpur. Perth requires 60 hosts. Kuala Lumpur requires 28 hosts. Sydney and Singapore each require 12 hosts. To calculate VLSM subnets and the respective hosts allocate the largest requirements first from the address range. Requirements levels should be listed from the largest to the smallest. In this example Perth requires 60 hosts. Use 6 bits since = 62 usable host addresses. Thus 2 bits will be used from the 4 th octet to represent the extended-network-prefix of /26 and the remaining 6 bits will be used for host addresses CCNA 3: Switching Basics and Intermediate Routing v Lab Copyright 2003, Cisco Systems, Inc.

2 Step 1 The first step in the subnetting process is to divide the allocated address of /24 into four equal size address blocks. Since 4 = 2 2, 2 bits are required to identify each of the 4 subnets. Next, take subnet #0 ( /26) and identify each of its hosts. Allocated Address Sub-networks 62 usable hosts/sub-network (subnet #0) / / /26 (Network Address) Here is the range for the /26 mask / / / / / /26 thru / / /26 (Broadcast Address) Perth /26 From 0 to 63, 60 hosts required. Hosts 0 and 63 cannot be used because they are the network and broadcast addresses for their subnet. Step 2 Allocate the next level after all the requirements are met for the higher level or levels. Kuala Lumpur requires 28 hosts. The next available address after /26 is /26. Note from the above table that this is subnet number 1. Since 28 hosts are required, 5 bits will be needed for the host addresses, = 30 usable host addresses. Thus 5 bits will be required to represent the hosts and 3 bits will be used to represent the extended-networkprefix of /27. Applying VLSM on address /27 gives: Sub-network #1 Sub-sub-networks 30 usable hosts / / / / / /27 (Network Address) /26 thru / / /27 (Broadcast Address) CCNA 3: Switching Basics and Intermediate Routing v Lab Copyright 2003, Cisco Systems, Inc.

3 Here is the range for the /27 mask. Kuala Lumpur /27 From 64 to 95, 28 hosts required. Hosts 64 and 95 cannot be used because they are the network and broadcast addresses for their subnet. Thirty usable addresses are available in this range for the hosts. Step 3 Now Sydney and Singapore require 12 hosts each. The next available address starts from /27. Note from Table 2 that this is the next subnet available. Since 12 hosts are required, 4 bits will be needed for the host addresses, 2 4 = 16, 16 2 = 14 usable addresses. Thus 4 bits are required to represent the hosts and 4 bits for the extended-network-prefix of /28. Applying VLSM on address /27 gives: Sub-network Sub-sub-networks 14 usable hosts / / /28 (Network Address) / / / /28 thru / / /28 (Broadcast Address) Here is the range for the /28 mask. Sydney /28 From 96 to 111, 12 hosts required. Hosts 96 and 111 cannot be used because they are network and broadcast addresses for their subnet. Fourteen useable addresses are available in this range for the hosts CCNA 3: Switching Basics and Intermediate Routing v Lab Copyright 2003, Cisco Systems, Inc.

4 Step 4 Since Singapore also requires 12 hosts, the next set of host addresses can be derived from the next available subnet ( /28). Sub-sub-networks 14 usable hosts / /28 (Network Address) / / / /28 Thru / / /28 (Broadcast Address) Here is the range for the /28 mask. Singapore /28 From 112 to 127, 12 hosts required. Hosts 112 and 127 cannot be used because they are network and broadcast addresses for their subnet. Fourteen usable addresses are available in this range for the hosts CCNA 3: Switching Basics and Intermediate Routing v Lab Copyright 2003, Cisco Systems, Inc.

6 Solution Diagram for VLSM lab LAN / 28 LAN / 28 Sing Sydn WAN / 30 WAN / 30 Kuala LAN / 27 WAN / 30 Perth LAN / 26 This diagram illustrates how the Class C address was subnetted using VLSM. The network address and broadcast address for each subnet are shown in the corners of each box. 0 / /30 / /30 / /28 / / CCNA 3: Switching Basics and Intermediate Routing v Lab Copyright 2003, Cisco Systems, Inc.

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