Cisco 2521LF - 2521LF Router Manuel d'utilisateur Page 4

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Copyright © 1997 Cisco Systems, Inc.
6-7CSE: Networking Fundamentals WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
A logical circuit ensuring reliable
communication between two devices
Switched virtual circuits (SVCs)
Dynamically established on demand
Torn down when transmission is complete
Used when data transmission is sporadic
Permanent virtual circuits (PVCs)
Permanently established
Save bandwidth for cases where certain
virtual circuits must exist all the time
Used in Frame Relay, X.25, and ATM
WAN Virtual Circuits
WAN Virtual Circuits
6-8CSE: Networking Fundamentals WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
OSI Reference Model
Physical
Layer
Data
Link
Layer
Network Layer
LLC
Sublayer
MAC
Sublayer
SMDS
X.21bis
EIA/TIA-232
EIA/TIA-449
V.24 V.35
HSSI G.703
EIA-530
HDLC
PPP
WAN Protocols
LAPB
X.25 PLP
Frame Relay
SDLC
WAN Protocols
WAN Protocols
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