007 Exploring the Packet Delivery Process

7/24/2019 007 Exploring the Packet Delivery Process

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

Building a Simple Network

!"loring the#$c%et Delivery#rocess


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Layer 1 Devices

&$yer 1 "rovides the "hysic$l medi$ $nd its encoding.

!$m"les'( thernet

( Seri$l

( )e"e$ter

( #hysic$l inter*$ce o* the NIC


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

Layer 2 Devices

&$yer 2 devices "rovide $n inter*$ce ith the "hysic$l medi$.

!$m"les'

( NIC

( ridge

( Sitch


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

Layer 2 Addressing

/AC $ddress

Assigned to end devices


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

Layer 3 Devices and Their unction

he netor% l$yer "rovides connectivity $nd "$th selectioneteen to host systems.

In the host, this is the "$th eteen the d$t$ lin% l$yer $nd the3""er l$yers o* the N4S.

In the ro3ter, it is the $ct3$l "$th $cross the netor%.


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Layer 3 Addressing

$ch N4S h$s its on &$yer + $ddress *orm$t.

4SI 3ses $n NSA#.

C#6I# 3ses I#.


7/37 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-7

A!"


8/37 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-

A!" Ta#le



$ost%to%$ost "acket Delivery &1 o' 22(



$ost%to%$ost "acket Delivery &) o' 22(


13/37 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-1+

$ost%to%$ost "acket Delivery &* o' 22(



$ost%to%$ost "acket Delivery &+ o' 22(



$ost%to%$ost "acket Delivery &, o' 22(



$ost%to%$ost "acket Delivery &- o' 22(



$ost%to%$ost "acket Delivery &. o' 22(



$ost%to%$ost "acket Delivery &1/ o' 22(



$ost%to%$ost "acket Delivery &1) o' 22(


23/37 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-2+

$ost%to%$ost "acket Delivery &1* o' 22(



$ost%to%$ost "acket Delivery &1+ o' 22(


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$ost%to%$ost "acket Delivery &1, o' 22(


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$ost%to%$ost "acket Delivery &1- o' 22(


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$ost%to%$ost "acket Delivery &1. o' 22(


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$ost%to%$ost "acket Delivery &2/ o' 22(


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De'ault 0ateway


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$ost%Based Tools ping


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$ost%Based Tools Ta#le


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$ost%Based Tools tracert


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Summary

&$yer 1 "rovides the "hysic$l medi$ $nd its encoding.

&$yer 2 devices "rovide $n inter*$ce ith the "hysic$l medi$.

&$yer 2 $ddresses $re /AC $ddresses.

he netor% l$yer "rovides connectivity $nd "$th selectioneteen to host systems.

&$yer + $ddresses $re I# $ddresses.


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Summary &ont(

e*ore $ host c$n send d$t$ to $nother host, it m3st h$ve the/AC $ddress o* th$t host.

I* the /AC $ddress is not %non, A)# is 3sed to m$" &$yer 2to &$yer +.

)eli$le comm3nic$tion re93ires $ C# session.

D$t$ sent m3st e $c%noledged.

I* hosts $re on di**erent segments, $ de*$3lt g$te$y is needed.

Sever$l host-$sed tools $re $v$il$le to chec% connectivityeteen hosts'

( ping

( tracert

( arp


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007 Exploring the Packet Delivery Process

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