VLSM Workbook. Variable-Length Subnet Mask. Instructor s Edition
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1 VLSM Variable-Length Mask Workbook Version Version 1.0 Instructor s Edition
2 IP Classes Class A 1 17 (Network 17 is reserved for loopback and internal testing) Leading bit pattern Network... Class B Leading bit pattern Network. Network.. Class C 19 3 Leading bit pattern Network. Network. Network. Class D 39 (Reserved for multicast) Class E 0 55 (Reserved for experimental, used for research) Class A to Class B to Class C to Private Space Class A Class B Class C Default Masks This workbook assumes you already have a background in subnetting. If you don t you may want to consider completing the IP ing and ting Workbook. Produced by: Robb Jones jonesr@careertech.net Frederick County Career & Technology Center Cisco Networking Academy Frederick County Public Schools Frederick, Maryland, USA Special Thanks to Melvin Baker and Jim Dorsch for taking the time to check this workbook for errors. Instructors (and anyone else for that matter) please do not post the Instructors version on public websites. When you do this your giving everyone else worldwide the answers. Yes, students look for answers this way. It also discourages others; myself included, from posting high quality materials. Inside Cover
3 What is VLSM Variable Length Masks allow you a much tighter control over your addressing scheme. If you use a class C address with a default subnet mask you end up with one subnet containing 5 addresses. By using VLSM you can adjust the number of subnets and number of addresses depending on the specific needs of your network. The same rules apply to a class A or B addresses. VLSM is supported by Cisco, OSPF, Dual IS-IS, BGP-, and EIGRP. You need to configure your router for Variable Length Masking by setting up one of these protocols. Then configure the subnet masks of the various interfaces in the IP address interface sub-command. To use supernet you must also configure IP classless routes. The Box Method The box method is the simplest way to visualize the breakdown of a range of addresses into smaller different sized subnets. Start with a square. The whole square is a single subnet comprised of 5 0 addresses. / s
4 Split the box in half and you get two subnets with 1 addresses, 0 1 / s s Divide the box into quarters and you get four subnets with addresses, 0 1 / s s Split each individual square and you get eight subnets with 3 addresses, s s
5 Split the boxes in half again and you get sixteen subnets with sixteen addresses, / s 1 s The next split gives you thirty two subnets with eight addresses, / s 3 s The last split gives sixty four subnets with four addresses each, You can use these squares in any combination to fit your addressing needs. / s s
6 VLSM ing (Sample) Problem 1 Using the network diagram and information given create an addressing scheme which utilizes variable-length subnet masks. Show the subnet address and subnet mask in the boxes below, color or shade the sub-subnets used in the box. This business will be using the class C address Remember to start with your largest groups first. Marketing Department 0 s Research Department s / Color in the squares used with different shades to highlight each subnet
7 VLSM ing (Sample) Problem Using the network diagram and information given create an addressing scheme which utilizes variable-length subnet masks. Show the subnet address and subnet mask in the boxes below, color or shade the sub-subnets used in the box. This company will be using the class C address Remember to start with your largest groups first. WAN #1: /30 Washington D.C. 10 s /5 WAN #: /30 Baltimore 0 s Frederick 0 s / Color in the squares used with different shades to highlight each sub-subnet
8 VLSM ing Problem 3 Using the network diagram and information given create an addressing scheme which utilizes variable-length subnet masks. Show the subnet address and subnet mask in the boxes below, color or shade the sub-subnets used in the box. This company will be using the class C address Remember to start with your largest groups first. Dallas. 0 s / WAN #1: /30 Ft. Worth 5 s Color in the squares used with different shades to highlight each sub-subnet
9 VLSM ing Problem Using the network diagram and information given create an addressing scheme which utilizes variable-length subnet masks. Show the subnet address and subnet mask in the boxes below, color or shade the sub-subnets used in the box. This company will be using the class C address Remember to start with your largest groups first. WAN #1: /30 Corpus Christi 5 s WAN #: /30 Houston 10 s Waco 50 s / / Color in the squares used with different shades to highlight each sub-subnet
10 VLSM ing Problem 5 Using the network diagram and information given create an addressing scheme which utilizes variable-length subnet masks. Show the subnet address and subnet mask in the boxes below, color or shade the subsubnets used in the box. This company will be using the class C address Remember to start with your largest groups first. WAN #1: /30 New York 115 s / / San Jose WAN #: /30 1 s Fargo 3 s s / Color in the squares used with different shades to highlight each sub-subnet
11 VLSM ing Problem Using the network diagram and information given create an addressing scheme which utilizes variable-length subnet masks. Show the subnet address and subnet mask in the boxes below, color or shade the subsubnets used in the box. This company will be using the class C address Remember to start with your largest groups first. WAN #1: WAN #: / /30 Boston London 1 s s / / s Draw the necessary lines and color in the used squares with different shades to highlight each sub-subnet. 37 s /
12 VLSM ing Problem 7 Using the network diagram and information given create an addressing scheme which utilizes variable-length subnet masks. Show the subnet address and subnet mask in the boxes below, color or shade the sub-subnets used in the box. This company will be using the class C address Remember to start with your largest groups first s Boston s /9 1 s / 1 s / Draw the necessary lines and color in the used squares with different shades to highlight each sub-subnet
13 VLSM ing Problem Using the network diagram and information given create an addressing scheme which utilizes variable-length subnet masks. Show the subnet address and subnet mask in the boxes below, color or shade the sub-subnets used in the box. This company will be using the class C address Remember to start with your largest groups first / WAN #1: /30 3 s London 1 s /5 95 s 1 s / Draw the necessary lines and color in the used squares with different shades to highlight each sub-subnet
14 VLSM ing 1 (Sample) Problem 9 You are developing a school network with the class C address /. There will be three computer labs with 30 computers each that need to be on different sub-subnets. Forty eight classrooms with one computer each that will comprise a single sub-subnet. The administrative office and guidance office contain a total of seven computers which will need to be grouped together. Plan for four more mini labs with six computers to each sub-subnetwork. Divide the network using variable length subnet masks. Complete the information required below. Remember to work from largest to smallest. Broadcast Last Usable First Usable Mask (/X) / / /9 /9 /9 /
15 VLSM ing (Sample) Problem 10 You are setting up a small business network with the class C address /. The marketing division will need 1 computers. Research and development needs 7 computers. The reception area will need two computers. Management requires 19 computers. Divide the network using variable length subnet masks. Complete the information required below. Remember to work from largest to smallest. Broadcast Last Usable First Usable Mask (/X) / /
16 VLSM ing 1 Problem 11 You are setting up a medium sized network with the class C address /. Marketing needs 9 computers. Research and development needs 110 computers. Bookkeeping will use 1 computers. The reception area will need three computers. Management requires 0 computers. Divide the network using variable length subnet masks. Complete the information required below. Remember to work from largest to smallest. Broadcast Last Usable First Usable Mask (/X) / / / /
17 VLSM ing Problem 1 A shipping company needs to set up its network across several locations. The Denver office needs six computers. The Waco office needs computers. The Fargo office will need five computers. The WAN links between all three locations need to be included in the solution. Using the IP address / divide the network using VLSM. Complete the information required below. Remember to work from largest to smallest. Broadcast Last Usable First Usable Mask (/X) /9 /9 /30 /
18 VLSM ing 1 Problem 13 A new school is being built in the local school district. It will have three computer labs with computers each. There will be 5 classrooms with computers each that need to be on one sub-subnet. The office staff and administrators will need 7 computers. The guidance and attendance office will have 5 computers. Setup the remaining addressing into one sub-subnet for future expansion. The school has been given the address /. Complete the information required below. Remember to work from largest to smallest. Broadcast Last Usable First Usable Mask (/X) / / /9 /
19 VLSM ing Problem 1 A local college is setting up a campus wide network. The technology wing will be on its own network address of /. The office wing will include 15 computers. There are labs of 0 computers each, labs of 30 computers each and one lab of 35 computers. Complete the information required below. Remember to work from largest to smallest. Broadcast Last Usable First Usable Mask (/X) /
20 VLSM ing 1 Problem 15 You are setting up a network for a company in four locations. Location A has computers. Location B has 1 computers. Location C has computers. Location D has 55 computers. There is a WAN connection between all four locations. Complete the information required below using the class C address Remember to work from largest to smallest. Broadcast Last Usable First Usable Mask (/X) / / / /9 /30 /30 /
21 VLSM ing Problem 1 A college dormitory is being remolded. A new network is being installed. There are 50 dorm rooms with two drops each that will be on one sub-subnet. The offices will have 5 drops. The reception desk will have three drops. A small study hall will include 30 drops. Using the IP address / complete the information required below using VLSM. Work from largest to smallest. Broadcast Last Usable First Usable Mask (/X) / /9 /
22 VLSM ing 0 Problem 17 You are setting up a business network with the class C address /. The marketing division will need 19 computers. Research and development needs 0 computers. The reception area will need four computers. Management requires 1 computers. Divide the network using variable length subnet masks. On the opposite page draw a detailed map of this network. Include the sub-subnet IP addresses for each branch of the network with the subnet mask. One router with four ethernet ports will be used for this network. Broadcast Last Usable First Usable Mask (/X) / / /
23 Problem 17 - Detailed Map Reception Computers to.119 Research & Development 0 Computers to Management 1 Computers to.111 Marketing 19 Computers to
24 VLSM ing Problem 1 A small company needs to set up its network across several locations. The New York branch office needs 15 computers. The San Jose office needs computers. The Trinidad office will need 1 computers. The WAN links between all three locations need to be included. Using the IP address / divide the network using VLSM. On the opposite page draw a detailed map of this network. Include the sub-subnet IP addresses for each branch of the network with the subnet mask. Label the WAN links with the same information. Complete the information required below. Work from largest to smallest. Broadcast Last Usable First Usable Mask (/X) / /30 /
25 Problem 1 - Detailed Map San Jose Trinidad New York to to Computers to Management 1 Computers to Reception Computers to
26 # of Bits Borrowed # of Bits Borrowed # of Bits Borrowed 3 5 Mask Mask Mask Class A ing Guide Total # of Usable # of s s ,0 1,0,0,0,09,09,19,190 1,3 1,3 3,7 3,7 5,53 5,53 131,07 131,070,1,1 5, 5, 1,0,57 1,0,57,097,15,097,150,19,30,19,30 Class B ing Guide Total # of Usable # of s s ,0 1,0,0,0,09,09,19,190 1,3 1,3 Class C ing Guide Total # of Usable # of s s Total # of s,19,30,097,15 1,0,57 5,,1 131,07 5,53 3,7 1,3,19,09,0 1, Total # of s 1,3,19,09,0 1, Total # of s 3 1 Usable # of s,19,30,097,150 1,0,57 5,,1 131,070 5,53 3,7 1,3,190,09,0 1, Usable # of s 1,3,190,09,0 1, Usable # of s 30 1
27 Inside Cover VLSM Chart -30 Bits / s / s / s s / s / s / s
28
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