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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-1

Building a Simple Network

nderst!nding the"C#$I# Internet%!yer

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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-2

Internet Protocol Characteristics

&'er!tes !t net(or) l!yer o* &SI

Connectionless 'rotocol

#!c)ets tre!ted inde'endently

+ier!rchic!l !ddressing

est-e**ort delivery

No d!t!-recovery *e!tres

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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-

Why IP Addresses?

"hey ni/ely identi*y e!ch device on !n I# net(or).

very host com'ter, net(or)ing device, 'eri'her!l mst h!ve! ni/e !ddress.

+ost ID34 Identi*ies the individ!l host

4 Is !ssigned 5y org!ni6!tions to individ!l devices

Net(or).+ost

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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-

IP PDU eader

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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-8

IP Address !ormat" Dotted DecimalNotation

"he 5in!ry-to-decim!l !nd decim!l-to-5in!ry conversion (ill 5e det!iled l!ter

in this corse.

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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-9

IP Address Classes" #he !irst $ctet

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7/18 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-7

IP Address %anges

:127 01111111 is ! Cl!ss A !ddress reserved *or loo'5!c) testing !nd c!nnot 5e!ssigned to ! net(or).

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8/18 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-;

%eser&ed Address

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9/18 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-