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Chabot College ELEC 99.05 Why Subnet? CISCO NETWORKING ACADEMY Why Subnet? • Security / Access control • Broadcast control • WAN links CISCO NETWORKING ACADEMY Security / Access Control • Given one class C network, • 3 subnets allow access rules to be different for each workgroup: CISCO NETWORKING ACADEMY Security / Access Control • Access Rules: – Engineering & Sales can’t access Sr. Management subnet. CISCO NETWORKING ACADEMY Security / Access Control • Access Rules: – All departments can access Intenet CISCO NETWORKING ACADEMY Broadcast Control • Given the class C network: 200.35.15.0 /24 • 3 subnets connected by a router • 3 small broadcast domains CISCO NETWORKING ACADEMY WAN Links • Given one class C network: 200.35.15.0 /24 • No subnets. • WAN link uses up the only network. (One IP address on each end of WAN link.) • No networks available for other segments: Headquarters Branch Office 200.35.15.2 200.35.15.1 CISCO NETWORKING ACADEMY 200.35.15.0 /24 net WAN Links • Given one class C network: 200.35.15.0 /24 • Subnet /27 • WAN link uses only one of several available subnets: 200.35.15.129 CISCO NETWORKING ACADEMY 200.35.15.128 /27 subnet 200.35.15.130 Headquarters Branch Office
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