Cisco 2521LF - 2521LF Router Manual de usuario Pagina 5

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Copyright © 1997 Cisco Systems, Inc.
6-9CSE: Networking Fundamentals WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
SDLC IBM’s SNA data link layer communications
protocol
HDLC Bit-oriented synchronous data link layer protocol
LAPB Data link layer protocol in the X.25 protocol stack
PPP Provides router-to-router and host-to-network
connections over sync and async circuits
X.25 Defines connections for remote terminal access
and computer communications in PDNs
ISDN Permits telephone networks to carry data, voice,
and other source traffic
Frame Relay Switched data link layer protocol that handles
multiple virtual circuits using HDLC; replacing
X.25 due to higher efficiency
WAN Protocols
WAN Protocols
© 1999, Cisco Systems, Inc.
www.cisco.com
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© 1999, Cisco Systems, Inc.
www.cisco.com
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