© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-1
nderst!nding the "C#$I# "r!ns%ort &!yer 
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-2
Transport Layer 
Connection-oriented +*hen re'ired
eli!/ility +*hen re'ired
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-
Flow Control
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-
Three-Way Handshake
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-4
Fixed Windowing
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-5
TCP Sliding Windowing
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-7
Reliable vs. est-!""ort Co#parison
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-6
%er!tes !t tr!ns%ort l!yer o8 SI !nd "C#$I# models
#rovides !%%lic!tions *ith !ccess to the net*or9 l!yer *itho't the overhe!d o8 reli!/ility mech!nisms
Is ! connectionless %rotocol
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-;
TCP Chara&teristi&s
Connection-oriented %rotocol
<rror chec9ing
D!t!-recovery 8e!t'res
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-10
)ile tr!ns8er 
emote login
N!me m!n!gement
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-11
+apping Layer , to )ppli&ations