007 exploring the packet delivery process
TRANSCRIPT
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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-1
Building a Simple Network
!"loring the#$c%et Delivery#rocess
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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-2
Layer 1 Devices
&$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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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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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-5
Layer 3 Addressing
$ch N4S h$s its on &$yer + $ddress *orm$t.
4SI 3ses $n NSA#.
C#6I# 3ses I#.
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A!"
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A!" Ta#le
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$ost%to%$ost "acket Delivery &1 o' 22(
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$ost%to%$ost "acket Delivery &) o' 22(
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$ost%to%$ost "acket Delivery &* o' 22(
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$ost%to%$ost "acket Delivery &11 o' 22(
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$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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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-2
$ost%to%$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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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-2
$ost%to%$ost "acket Delivery &2/ o' 22(
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$ost%to%$ost "acket Delivery &21 o' 22(
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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-+0
$ost%to%$ost "acket Delivery &22 o' 22(
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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-+1
De'ault 0ateway
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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-+2
$ost%Based Tools ping
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$ost%Based Tools Ta#le
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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-+
$ost%Based Tools tracert
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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-+7
Summary
&$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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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-+
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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