TAILIEUCHUNG - Lecture CCNA Exploration 4.0 (Kỳ 2) - Chapter 6: VLSM and CIDR

This chapter 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. | Chapter 6 VLSM and CIDR Rlllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll I BftCHKHOfl NETWORKING KfiDEMY CCNA Exploration version Cisco Systems Networking ACADEMY 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 Học viện mạng Bách Khoa - Website 2 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. 1. VLSM is simply subnetting a subnet 2. Subnets can be further subnetted in multiple levels 3. In addition to subnetting it became possible to summarize a large collection of classful networks into an aggregate route or supernet. Học viện mạng Bách Khoa - Website

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