Activity 6.4.2: Challenge VLSM Calculation and Addressing Design (Instructor Version) Topology Diagram
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1 Activity 6.4.2: Challenge VLSM Calculation and ing Design (Instructor Version) Topology Diagram All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 1 of 12
2 Activity 6.4.2: Challenge VLSM Calculation and ing Design Learning Objectives: Determine the number of subnets needed. Determine the number of hosts needed for each subnet. Design an appropriate addressing scheme using VLSM. Scenario In this activity, you have been given the network address /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 /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 (Southeast Branch2) 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. West Network Section The S-WEST (Southwest) LAN1 will require 4000 host IP addresses. 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. Central Network Section The Central LAN1 will require 8000 host IP addresses. The Central LAN2 will require 4000 host IP addresses. 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 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. 1. How many LAN subnets are needed? How many subnets are needed for the WAN links between routers? How many total subnets are needed? 31 All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 2 of 12
3 Activity 6.4.2: Challenge VLSM Calculation and ing Design 4. What is the maximum number of host IP addresses that are needed for a single subnet? 8, What is the least number of host IP addresses that are needed for a single subnet? How many IP addresses are needed for the East portion of the network? Be sure to include the WAN links between the routers. 11, How many IP addresses are needed for the West portion of the network? Be sure to include the WAN links between the routers. 10, How many IP addresses are needed for the Central portion of the network? Be sure to include the WAN links between the routers. 12, What is the total number of IP addresses that are needed? 34, What is the total number of IP addresses that are available in the /16 network? 65, Can the network addressing requirements be met using the /16 network? yes Task 2: Divide the Network into Three Subnetworks. Step 1: Determine the subnet information for each network section. To keep the subnets of each of the major network sections contiguous, begin by creating a main subnet for each of the East, West, and Central network sections. 1. What is the smallest size subnet that can be used to meet the addressing requirement for the East network? /18 16, What is the smallest size subnet that can be used to meet the addressing requirement for the West network? /18 4. What is the maximum number of IP addresses that can be assigned in this size subnet? 16, What is the smallest size subnet that can be used to meet the addressing requirement for the Central network? /18 6. What is the maximum number of IP addresses that can be assigned in this size subnet? 16,384 Step 2: Assign subnets. 1. Start at the beginning of the /16 network. Assign the first available subnet to the East section of the network. East Subnet Network Decimal Subnet / Assign the next available subnet to the West section of the network. All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 3 of 12
4 Activity 6.4.2: Challenge VLSM Calculation and ing Design 4. Fill in the chart below with the appropriate information. West Subnet Network Decimal Subnet / Assign the next available subnet to the Central section of the network. 6. Fill in the chart below with the appropriate information. Central Subnet Network Decimal Subnet / Task 3: Design an IP ing Scheme for the Central Network. Step 1: Determine the subnet information for the Central LAN1. Use the address space that was designated for the Central network in Task What is the smallest size subnet that can be used to meet this requirement? /19 8,190 Step 2: Assign subnet to Central LAN1. Start at the beginning of the address space designated for the Central network. 1. Assign the first subnet to the Central LAN1. Central LAN1 Subnet / Step 3: Determine the subnet information for the Central LAN2. 1. What is the smallest size subnet that can be used to meet this requirement? /20 4,094 Step 4: Assign subnet to Central LAN2. 1. Assign the next available subnet to the Central LAN2. Central LAN2 Subnet / All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 4 of 12
5 Activity 6.4.2: Challenge VLSM Calculation and ing Design Step 5: Determine the subnet information for the WAN link between the Central router and the HQ router. 1. What is the smallest size subnet that can be used to meet this requirement? /30 2 Step 6: Assign subnet to WAN link. 1. Assign the next available subnet to the WAN link between the Central router and the HQ router. WAN link between Central and HQ Subnet Network Decimal Subnet / Task 4: Design an IP ing Scheme for the West Network. Step 1: Determine the subnet information for the S-WEST LAN1. Use the address space that was designated for the West network in Task What is the smallest size subnet that can be used to meet this requirement? /20 4,094 Step 2: Assign subnet to S-WEST LAN1. Start at the beginning of the address space designated for the West network. 1. Assign the first subnet to the S-WEST LAN1. S-WEST LAN1 Subnet / Step 3: Determine the subnet information for the S-WEST LAN2. 1. What is the smallest size subnet that can be used to meet this requirement? /20 4,094 Step 4: Assign subnet to S-WEST LAN2. 1. Assign the next available subnet to the S-WEST LAN2. All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 5 of 12
6 Activity 6.4.2: Challenge VLSM Calculation and ing Design S-WEST LAN2 Subnet / Step 5: Determine the subnet information for the NW-BR1 LAN1. 1. What is the smallest size subnet that can be used to meet this requirement? /21 2,046 Step 6: Assign subnet to NW-BR1 LAN1. 1. Assign the next available subnet to the NW-BR1 LAN1. NW-BR1 LAN1 Subnet / Step 7: Determine the subnet information for the NW-BR1 LAN2. 1. What is the smallest size subnet that can be used to meet this requirement? /21 2,046 Step 8: Assign subnet to NW-BR1 LAN2. 1. Assign the next available subnet to the NW-BR1 LAN2. NW-BR1 LAN2 Subnet / Step 9: Determine the subnet information for the NW-BR2 LAN1. 1. What is the smallest size subnet that can be used to meet this requirement? /22 1,022 Step 10: Assign subnet to NW-BR2 LAN1. 1. Assign the next available subnet to the NW-BR2 LAN1. All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 6 of 12
7 Activity 6.4.2: Challenge VLSM Calculation and ing Design NW-BR2 LAN1 Subnet / Step 11: Determine the subnet information for the NW-BR2 LAN2. 1. What is the smallest size subnet that can be used to meet this requirement? /22 1,022 Step 12: Assign subnet to NW-BR2 LAN2. 1. Assign the next available subnet to the NW-BR2 LAN2. NW-BR2 LAN2 Subnet / WAN Link Step 13: Determine the subnet information for the WAN links between the routers in the West network. 1. How many router to router WAN links are present in the West network? 5 2. How many IP addresses are needed for each of these WAN links? 2 3. What is the smallest size subnet that can be used to meet this requirement? /30 4. What is the maximum number of IP addresses that can be assigned in this size subnet? 2 Step 14: Assign subnets to WAN links. 1. Assign the next available subnets to the WAN links between the routers. WAN links between the Routers in the West Network HQ to WEST WEST to S-WEST WEST to N-WEST N-WEST to NW-BR1 N-WEST to NW-BR2 CIDR Subnet / / / / / All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 7 of 12
8 Activity 6.4.2: Challenge VLSM Calculation and ing Design Task 5: Design an IP ing Scheme for the East Network. Step 1: Determine the subnet information for the N-EAST LAN1. Use the address space that was designated for the East network in Task What is the smallest size subnet that can be used to meet this requirement? /20 4,094 Step 2: Assign subnet to N-EAST LAN1. Start at the beginning of the address space designated for the East network. 1. Assign the first subnet to the N-EAST LAN1. N-EAST LAN1 Subnet / Step 3: Determine the subnet information for the N-EAST LAN2. 1. What is the smallest size subnet that can be used to meet this requirement? /20 4,094 Step 4: Assign subnet to N-EAST LAN2. 1. Assign the next available subnet to the N-EAST LAN2. N-EAST LAN2 Subnet / Step 5: Determine the subnet information for the SE-BR1 LAN1. 1. What is the smallest size subnet that can be used to meet this requirement? /22 1,022 Step 6: Assign subnet to SE-BR1 LAN1. 1. Assign the next available subnet to the SE-BR1 LAN1. All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 8 of 12
9 Activity 6.4.2: Challenge VLSM Calculation and ing Design SE-BR1 LAN1 Subnet / Step 7: Determine the subnet information for the SE-BR1 LAN2. 1. What is the smallest size subnet that can be used to meet this requirement? /22 1,022 Step 8: Assign subnet to SE-BR1 LAN2. 1. Assign the next available subnet to the SE-BR1 LAN2. SE-BR1 LAN2 Subnet / Step 9: Determine the subnet information for the SE-BR2 LAN1. 1. What is the smallest size subnet that can be used to meet this requirement? / Step 10: Assign subnet to SE-BR2 LAN1. 1. Assign the next available subnet to the SE-BR2 LAN1. SE-BR2 LAN1 Subnet / Step 11: Determine the subnet information for the SE-BR2 LAN2. 1. What is the smallest size subnet that can be used to meet this requirement? / Step 12: Assign subnet to SE-BR2 LAN2. 1. Assign the next available subnet to the SE-BR2 LAN2. All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 9 of 12
10 Activity 6.4.2: Challenge VLSM Calculation and ing Design SE-BR2 LAN2 Subnet / Step 13: Determine the subnet information for the SE-ST1 LAN1. 1. What is the smallest size subnet that can be used to meet this requirement? / Step 14: Assign subnet to SE-ST1 LAN1. 1. Assign the next available subnet to the SE-ST1 LAN1. SE-ST1 LAN1 Subnet / Step 15: Determine the subnet information for the SE-ST1 LAN2. 1. What is the smallest size subnet that can be used to meet this requirement? / Step 16: Assign subnet to SE-ST1 LAN2. 1. Assign the next available subnet to the SE-ST1 LAN2. SE-ST1 LAN2 Subnet / Step 17: Determine the subnet information for the SE-ST2 LAN1. 1. What is the smallest size subnet that can be used to meet this requirement? / Step 18: Assign subnet to SE-ST2 LAN1. 1. Assign the next available subnet to the SE-ST2 LAN1. All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 10 of 12
11 Activity 6.4.2: Challenge VLSM Calculation and ing Design SE-ST2 LAN1 Subnet / Step 19: Determine the subnet information for the SE-ST2 LAN2. 1. What is the smallest size subnet that can be used to meet this requirement? / Step 20: Assign subnet to SE-ST2 LAN2. 1. Assign the next available subnet to the SE-ST2 LAN2. SE-ST2 LAN2 Subnet / Step 21: Determine the subnet information for the WAN links between the routers in the East network. 1. How many router to router WAN links are present in the East network? 7 2. How many IP addresses are needed for each of these WAN links? 2 3. What is the smallest size subnet that can be used to meet this requirement? /30 4. What is the maximum number of IP addresses that can be assigned in this size subnet? 2 All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 11 of 12
12 Activity 6.4.2: Challenge VLSM Calculation and ing Design Step 22: Assign subnets to WAN links. 1. Assign the next available subnets to the WAN links between the routers. WAN links between the Routers in the East Network WAN link Network Decimal Subnet CIDR Subnet HQ to EAST EAST to S-EAST EAST to N-EAST S-EAST to SE-BR1 S-EAST to SE-BR2 SE-BR2 to SE-ST1 SE-BR2 to SE-ST / / / / / / / All contents are Copyright Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 12 of 12
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