CCNA 4 v3.0 Module 2 WAN Technologies. Cisco Networking Academy. Objectives. WAN Technologies Overview WAN Technologies WAN Design. (Phone Company). “Last Mile”. WAN Technology. POP. T1. WAN Service Providers. WAN Authorities. ( ITU-T ), formerly the ( CCITT )
Cisco Networking Academy
“Last Mile”WAN Technology
T1WAN Service Providers
Clock SignalPhysical Layer: WANs
Digital Service Unit
Circuit is created for duration of the call
and torn down after call is over.
High-Level Data Link Control (HDLC) - An ISO standard. HDLC might not be compatible between different vendors because of the way each vendor has chosen to implement it. HDLC supports both point-to-point and multipoint configurations.
Cisco uses its own proprietary implementation of HDLC as the default encapsulation on all serial interfaces.
Basic Rate Interface
Primary Rate Interface
Integrated Services Digital Network (ISDN)
2503 or 2513
2600 w/ WIC1-BU
VC = Virtual Circuit
Frame Relay - By using a simplified framing with no error correction mechanisms over high-quality digital facilities, Frame Relay can transmit data very rapidly, compared to these other WAN protocols.
Frame Relay is the successor to X.25 and is designed to run over high speed fiber as well as copper.
Point-to-Point Protocol (PPP) - Described by RFC 1661, two standards developed by the IETF. PPP contains a protocol field to identify the network-layer protocol.
PPP allows for dynamic address allocation and authentication.
Digital Subscriber Line (DSL) technology is a broadband technology that
uses existing twisted-pair telephone lines to transport high-bandwidth
data to service subscribers.