Chabot College ELEC 99.05 Why Subnet?

Why Subnet? Security / Access control Broadcast control WAN links

Security / Access Control Given one class C network, 3 subnets allow access rules to be different for each workgroup: Senior Managerment subnet Sales subnet Engineering subnet

Security / Access Control Access Rules: Engineering & Sales can’t access Sr. Management subnet. Senior Management subnet Sales subnet Engineering subnet

Security / Access Control Access Rules: All departments can access Intenet Senior Management subnet Sales subnet Engineering subnet

Broadcast Control Given the class C network: 200.35.15.0 /24 3 subnets connected by a router 3 small broadcast domains 200.35.15.32 /27 subnet 200.35.15.96 /27 subnet 200.35.15.64 /27 subnet

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 200.35.15.2 200.35.15.1 200.35.15.0 /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: Headquarters Branch Office 200.35.15.32 /27 subnet 200.35.15.130 200.35.15.129 200.35.15.128 /27 subnet 200.35.15.96 /27 subnet 200.35.15.64 /27 subnet