VLSM101 v1.2

VLSM101 v1.2 - 2007 Cisco Systems, Inc. All rights...

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Unformatted text preview: 2007 Cisco Systems, Inc. All rights reserved. Cisco Public ITE PC v4.0 Chapter 1 1 VLSM101 ITE PC v4.0 Chapter 1 2 2007 Cisco Systems, Inc. All rights reserved. Cisco Public VLSM 101 What is VLSM? Recall: Why Subnet? Advantages of VLSM Minor Issues in VLSM VLSM Calculation VLSM Calculation Technique ITE PC v4.0 Chapter 1 3 2007 Cisco Systems, Inc. All rights reserved. Cisco Public What is VLSM? Variable-Length Subnet Mask Maximizes addressing efficiency. Subnetting a Subnet ITE PC v4.0 Chapter 1 4 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Recall: Why Subnet? Topology X IP Block: 192.168.0.0 /24 ITE PC v4.0 Chapter 1 5 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Recall: Why Subnet? 192.168.0.0 /24 192.168.0.0 /24 192.168.1.0 /24 192.168.2.0 /24 Without subnetting, Topology X IP Block: 192.168.0.0 /24 ITE PC v4.0 Chapter 1 6 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Recall: Why Subnet? 192.168.0.0 /24 192.168.0.0 /27 192.168.0.32 /27 192.168.0.64 /27 192.168.0.96 /27 192.168.0.128 /27 192.168.0.160 /27 192.168.0.192 /27 192.168.0.224 /27 How? Click Here With basic subnetting, Topology X IP Block: 192.168.0.0 /24 ITE PC v4.0 Chapter 1 7 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Why Subnet? Host requirement : 25 hosts For basic subnetting, 2 n Greatest number of hosts + 2 ( n = host bits; used to determine the prefix) 2 n 25 + 2 2 n 27 Eventually, n = 5 Finally, Prefix = 32 n Prefix = 32 5 Thus, Prefix = 27 (+2 represents both the network and broadcast addresses) 192.168.0.0 /24 192.168.0.0 /27 192.168.0.32 /27 192.168.0.64 /27 192.168.0.96 /27 192.168.0.128 /27 192.168.0.160 /27 192.168.0.192 /27 192.168.0.224 /27 With basic subnetting, ITE PC v4.0 Chapter 1 8 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Recall: Why Subnet? Topology X.2 IP Block: 192.168.0.0 /24 ITE PC v4.0 Chapter 1 9 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Recall: Why Subnet? 192.168.0.0 /24 192.168.0.0 /27 192.168.0.32 /27 192.168.0.64 /27 192.168.0.96 /27 192.168.0.128 /27 192.168.0.160 /27 192.168.0.192 /27 192.168.0.224 /27 With basic subnetting, Topology X.2 IP Block: 192.168.0.0 /24 No significant effect ITE PC v4.0 Chapter 1 10 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Limitation of Basic Subnetting Topology X.3 IP Block: 192.168.0.0 /24 ITE PC v4.0 Chapter 1 11 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Limitation of Basic Subnetting 192.168.0.0 /24 192.168.0.0 /25 192.168.0.128 /25 With basic subnetting, 192.168.1.0 /24 192.168.1.0 /25 192.168.1.128 /25 Highest host requirement dictates subnet mask Topology X.3 ITE PC v4.0 Chapter 1 12 2007 Cisco Systems, Inc. All rights reserved. 2007 Cisco Systems, Inc....
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VLSM101 v1.2 - 2007 Cisco Systems, Inc. All rights...

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