Chapter 6 Variable Length Subnet Masking (VLSM) Classless Inter ...

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Variable Length Subnet Masking (VLSM)• A serious limitation of using only a single subnet mask acrossa given network-prefix(the number of network or 1 bits in themask) was that an organization is locked into a fixed-numberof fixed-sized subnets.• VLSM enables a network number to be configured withdifferent subnet masks on different interfaces.• Subnet an already subnetted network address.• Conserves IP addresses.• More efficient use of available address space.• Allows for more hierarchical levels within an addressing plan.CCNA2-27 Chapter 6Variable Length Subnet Masking (VLSM)10.0.0.0/8 Subnet using /16Subnet1 st HostLast HostBroadcast10.0.0.0/16 10.0.0.1 10.0.255.254 10.0.255.25510.1.0.0/16 10.1.0.1 10.1.255.254 10.1.255.25510.2.0.0/16 10.2.0.1 Subnet10.2.255.254 1 Host10.2.255.255Last HostBroadcast10.3.0.0/16 10.2.0.0/24 10.3.0.1 10.3.255.254 10.2.0.1 10.3.255.25510.2.0.254 10.2.0.255Sub-subnetEtc.10.2.1.0/24 10.2.1.1 10.2.1.254 10.2.1.25510.255.0.0/16 Using /24 10.2.2.0/24 10.255.0.1 10.255.255.254 10.2.2.1 10.255.255.25510.2.2.254 10.2.2.255Etc.10.2.255.0/24 10.2.255.1 10.2.255.254 10.2.255.255CCNA2-28 Chapter 6
Variable Length Subnet Masking (VLSM)192.168.20.64/27192.168.20.128/27192.168.20.0/27192.168.20.128/27192.168.20.32/27 192.168.20.96/27 192.168.20.64/277 Networks with 30usable addresses foreach networkWasted 28 addresseson each WAN linkCCNA2-29 Chapter 6Variable Length Subnet Masking (VLSM)192.168.20.32/27192.168.20.96/27192.168.20.0/27192.168.20.64/27CCNA2-30 Chapter 6
Page 1 and 2: Chapter 6Variable Length Subnet Mas
Page 3 and 4: Classful IP Addressing• ARPANET -
Page 5 and 6: Classful Routing ProtocolR2 applies
Page 7 and 8: CIDR and Route SummarizationNetwork
Page 9 and 10: VLSM and CIDRVariable Length Subnet
Page 11 and 12: Review - Creating a Subnet - The Ru
Page 13: Dividing Networks Into the Right Si
Page 17: Variable Length Subnet Masking (VLS

Chapter 6 Variable Length Subnet Masking (VLSM) Classless Inter ...

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