2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-1
A netor! is " connected collection o# devices
$com%&ters,interconnections, ro&ters, "nd sitches' th"t c"n
comm&nic"teith e"ch other, %roviding the me"ns #or &sers to
sh"re (othh"rd"re "nd "%%lic"tions.
)od"y*s netor! m&st (e sec&red #rom (oth %hysic"l "nd
netor!"tt"c!s.
+thernet is the most common ty%e o# AN, "nd it h"s its
on&ni&e ch"r"cteristics. St"nd"rds s%eci#y c"(ling "nd
sign"ling#or +thernet ANs "t (oth the %hysic"l "nd d"t" lin! l"yers
o# the
SI model.
/its th"t "re tr"nsmitted over "n +thernet AN "re org"nied
into#r"mes. +thernet ANs m"n"ge the sign"ls on " netor! (y "%rocess
c"lled CSACD.
Module Summary
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2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.01-2
Module Summary (Cont.)
3ost-to-host comm&nic"tions "re governed (y SI "nd
)C4I4.
)he SI re#erence model de#ines the netor! #&nctions th"t
occ&r"t e"ch l"yer "nd #"cilit"tes "n &nderst"nding o# ho
in#orm"tiontr"vels thro&gho&t " netor!.
