Chapter 6 Routing Text

Chapter 6 Routing Text - VLSM and CIDR Routing Protocols...

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© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1 Version 4.0 VLSM and CIDR Routing Protocols and Concepts – Chapter 6
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2 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Objectives Compare and contrast classful and classless IP addressing. Review VLSM and explain the benefits of classless IP addressing. Describe the role of the Classless Inter-Domain Routing (CIDR) standard in making efficient use of scarce IPv4 addresses.
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3 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Introduction Prior to 1981, IP addresses used only the first 8 bits to specify the network portion of the address In 1981, RFC 791 modified the IPv4 32-bit address to allow for three different classes IP address space was depleting rapidly The Internet Engineering Task Force (IETF) introduced Classless Inter-Domain Routing (CIDR) CIDR uses Variable Length Subnet Masking (VLSM) to help conserve address space VLSM is simply subnetting a subnet
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4 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Classful and Classless IP Addressing Classful IP addressing As of January 2007, there are over 433 million hosts on internet Initiatives to conserve IPv4 address space include: Network Address Translation (1994, RFC 1631) Private Addressing (1996, RFC 1918)
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5 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Classful and Classless IP Addressing The High Order Bits These are the leftmost bits in a 32 bit address
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6 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Classful and Classless IP Addressing Classes of IP addresses are identified by the decimal number of the 1st octet
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Chapter 6 Routing Text - VLSM and CIDR Routing Protocols...

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