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

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Classless IP Addressing• To CIDR-compliant routers, address class is meaningless.• The network portion of the address is determined by thenetwork subnet mask, , also known as the network prefix,or prefix length (/8, /19, etc.).• The network address is no longer determined by the class ofthe address.CCNA2-11 Chapter 6CIDR and Route Summarization• The capability for routes to be summarized as a single routehelped reduce the size of Internet routing tables.• A Supernet summarizes multiple network addresses with amask that is less than (or a summary of) the classful mask.CCNA2-12 Chapter 6
CIDR and Route SummarizationNetworks to be summarizedMUST be contiguous.Summary192.168.0.0/23 11000000.10101000.00000000.000000000000.00000000192.168.2.0/23 11000000.10101000.00000010.000000000010.00000000192.168.4.0/22 11000000.10101000.00000100.000000000100.00000000192.168.8.0/21 11000000.10101000.00001000.000000001000.00000000192.168.0.0/20 11000000.10101000.00000000.000000000000.00000000• Networks are converted to binary.• The summary route is comprised of the least number of bitsthat are common to all subnets.CCNA2-13 Chapter 6CIDR and Route SummarizationSummary192.168.0.0/23 11000000.10101000.00000000.000000000000.00000000192.168.2.0/23 11000000.10101000.00000010.000000000010.00000000192.168.4.0/22 11000000.10101000.00000100.000000000100.00000000192.168.8.0/21 11000000.10101000.00001000.000000001000.00000000192.168.0.0/20 11000000.10101000.00000000.000000000000.00000000• Requires a classless routing protocol (RIPv2, EIGRP, OSPF).• The subnet mask of the network MUST be included with therouting update.CCNA2-14 Chapter 6
Page 1 and 2: Chapter 6Variable Length Subnet Mas
Page 3 and 4: Classful IP Addressing• ARPANET -
Page 5: Classful Routing ProtocolR2 applies
Page 9 and 10: VLSM and CIDRVariable Length Subnet
Page 11 and 12: Review - Creating a Subnet - The Ru
Page 13 and 14: Dividing Networks Into the Right Si
Page 15 and 16: Variable Length Subnet Masking (VLS
Page 17: Variable Length Subnet Masking (VLS

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