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Activity 6.4.2: Challenge VLSM Calculation and Addressing Design (Instructor Version)
Topology Diagram

Page 1 of 12

CCNA Exploration Routing Protocols and Concepts: VLSM and CIDR

Activity 6.4.2: Challenge VLSM Calculation and Addressing Design

Learning Objectives:
• • • Determine the number of subnets needed. Determine the number of hosts needed for each subnet. Design anappropriate addressing scheme using VLSM.

Scenario
In this activity, you have been given the network address 172.16.0.0/16 to subnet and provide the IP addressing for the network shown in the Topology Diagram. VLSM will be used so that the addressing requirements can be met using the 172.16.0.0/16 network. The network has the following addressing requirements: • East Network Section • • • • • • • • • •• • • • • • • • • • • The N-EAST (Northeast) LAN1 will require 4000 host IP addresses. The N-EAST (Northeast) LAN2 will require 4000 host IP addresses. The SE-BR1 (Southeast Branch1) LAN1 will require 1000 host IP addresses. The SE-BR1 (Southeast Branch1) LAN2 will require 1000 host IP addresses. The SE-BR2 (Southeast Branch2) LAN1 will require 500 host IP addresses. The SE-BR2 (SoutheastBranch2) LAN2 will require 500 host IP addresses. The SE-ST1 (Southeast Satellite1) LAN1 will require 250 host IP addresses. The SE-ST1 (Southeast Satellite1) LAN2 will require 250 host IP addresses. The SE-ST2 (Southeast Satellite2) LAN1 will require 125 host IP addresses. The SE-ST2 (Southeast Satellite2) LAN2 will require 125 host IP addresses. The S-WEST (Southwest) LAN1 will require 4000 host IPaddresses. The S-WEST (Southwest) LAN2 will require 4000 host IP addresses. The NW-BR1 (Northwest Branch1) LAN1 will require 2000 host IP addresses. The NW-BR1 (Northwest Branch1) LAN2 will require 2000 host IP addresses. The NW-BR2 (Northwest Branch2) LAN1 will require 1000 host IP addresses. The NW-BR2 (Northwest Branch2) LAN2 will require 1000 host IP addresses. The Central LAN1 will require 8000host IP addresses. The Central LAN2 will require 4000 host IP addresses.

West Network Section

Central Network Section

The WAN links between each of the routers 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 NetworkRequirements.
Examine the network requirements and answer the questions below. Keep in mind that IP addresses will be needed for each of the LAN interfaces. 1. How many LAN subnets are needed? _______ 18 2. How many subnets are needed for the WAN links between routers? _______ 13 3. How many total subnets are needed? _______ 31
All contents are Copyright © 1992–2007 Cisco Systems, Inc. All rightsreserved. This document is Cisco Public Information. Page 2 of 12

CCNA Exploration Routing Protocols and Concepts: VLSM and CIDR

Activity 6.4.2: Challenge VLSM Calculation and Addressing Design

4. What is the maximum number of host IP addresses that are needed for a single subnet? _______ 8,000 5. What is the least number of host IP addresses that are needed for a single subnet? _______ 1256. How many IP addresses are needed for the East portion of the network? Be sure to include the WAN links between the routers. __________ 11,764 7. How many IP addresses are needed for the West portion of the network? Be sure to include the WAN links between the routers. __________ 10,410 8. How many IP addresses are needed for the Central portion of the network? Be sure to include the WAN linksbetween the routers. __________ 12,002 9. What is the total number of IP addresses that are needed? __________ 34,176 10. What is the total number of IP addresses that are available in the 172.16.0.0/16 network? _________ 65,534 11. Can the network addressing requirements be met using the 172.16.0.0/16 network? _______ yes

Task 2: Divide the Network into Three Subnetworks.
Step 1: Determine...
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