Topic 02c - VLSM (1).pdf - Topic 02 VLSM subnetting...

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Topic 02 VLSM subnetting
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Announcements
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Main points and skills Design subnet masks to meet requirements, using VLSM VLSM from the designer’s point of view is powerful VLSM from the admin’s point of view is trouble Tools exist, make use of them
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Definitions Subnet Prefix Mask Subnet ID Subnet broadcast address Usable addresses
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Designing subnets with VLSM VSLM benefit – reduce address waste Serial links between routers Three VSLM problems (D) - Design using VLSM (A) - Find subnet overlaps in existing design (A) - Add a new subnet to an existing design
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Designing subnets with VLSM Design requirements No mask - impossible reqs “Unique masks” – easy (still multiple solutions) Multiple masks – how to choose one?
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VSLM Design example
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VSLM Design Methodology: not unique Helps to “visualize” the address space as “linear”
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VSLM Design Methodology 1. Find the block (B1) with the largest number of hosts 2. Pick a mask (yellow? Red?) to fulfill this
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