Itnv51 Stundent-ppt Ch8

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Introduction to Networks v5.1

Chapter 8:

Subnetting IP networks

Instructor Name: Touch Ra

30,April 2016


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2013 Cisco and/or its affiliates. All rights reserved. Cisco Public 2

8.0 Introduction

8.1 Subnetting an IPv4 Network

8.2 Addressing Schemes

8.3 Design Considerations forIPv6

8.4 Summary


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Cisco Public 2013 Cisco and/or its affiliates. All rights reserved. 3


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Each router interface connects a broadcast domain and broadcasts

are only propagated within its specific broadcast domain.


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Slow network operations due to the significant amount ofbroadcast traffic.

Slow device operations because a device must accept andprocess each broadcast packet.


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Solution -reduce the size of the network to create smallerbroadcast domains in a process called subnetting.

These smaller network spaces are called subnets.


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Network administrators can group devices and services into subnets that are

determined by: Location


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determined by: Organizational unit.


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determined by: Device type.


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Subnetting 10.x.x.0/24

Subnetting 10.x.0.0/16


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/25 Borrowing 1 bit from the fourth octet creates 2 subnets supporting 126hosts each.

/26 Borrowing 2 bits creates 4 subnets supporting 62 hosts each.






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To calculate the number of subnets.


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To calculate the number of hosts.


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Calculating Hosts


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Two considerations when planning subnets:

The number of host addresses required for each network.

The number of individual subnets needed.

The more bits borrowed to create subnets, the fewer host bits available.


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Upon completion of this section, you should be able to:

Implement a VLSM addressing scheme.


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Upon completion of this section, you should be able to:

Explain how to implement IPv6 address assignments in a business network.


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The IPv6 global unicast address normally consists of a /48 global routing prefix, a

16 bit subnet ID, and a 64 bit interface ID.


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Thank you.

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Itnv51 Stundent-ppt Ch8