Lecture09 - Subnetworking

Lecture09 - Subnetworking - 1 CNIT 240 CNIT 240 – Data...

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Unformatted text preview: 10/28/2009 1 CNIT 240 CNIT 240 – Data Data Communications and Communications and Networks Networks Subnetworking Objectives Identify the subnetworking process Understand the need for subnetworking Understand the implementation of subnetworked address space Build the foundation of address utilization for future studies 10/28/2009 2 Purpose of Layer 3 Addressing End to End communication Uniquely identifiable network ID Uniquely identifiable host ID How do we do that? IP Addressing We assign a single 32-bit binary value to each host residing in a network segment Represented in “dotted decimal” form Dotted decimal form is four 8-bit groupings [octets] 10000000110100101000101100011111 10000000 11010010 10001011 00011111 128 210 139 31 128.210.139.31 How do we know where the network ID stops and the host ID begins? 4 10/28/2009 3 3 Approaches Classes 3 classes (RFC 791 in 1981) 4 classes (RFC 988 in 1986) 5 classes (RFC 3330 in 2002) Fixed-Length Subnetwork Mask Created the idea of sub-networks (RFC 940 in 1985) Non-Fixed-Length Subnetwork Masks VLSM (RFC 950 in 1985) CIDR (RFC 1518 in 1993) 5 IP Addressing – Class-based One address for: Subnetwork ID Host ID How is this represented? 6 Class ID 1 1 0 (3 bits) (1 bit) 1 0 (2 bits) 126 different Network IDs (7 bits) Network ID Host ID (24 bits) 16,777,214 different Host IDs CLASS A Class ID CLASS C Class ID CLASS B Host ID (16 bits) 65,534 different Host IDs 16,382 different Network IDs (14 bits) Network ID 2,097,150 different Network IDs (21 bits)...
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This note was uploaded on 03/26/2010 for the course CIT 240 taught by Professor None during the Spring '10 term at Purdue.

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Lecture09 - Subnetworking - 1 CNIT 240 CNIT 240 – Data...

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