Defining WAN Terms
Before you run out and order a WAN service type from a provider, it would be understand the following terms that service providers typically use:
atm-dxi ATM-DXI encapsulation frame-relay Frame Relay networks hdlc Serial HDLC synchronous lapb LAPB (X.25 Level 2) ppp Point-to-Point protocol smds Switched Megabit Data Service (SMDS) x25 X.25
Link Control Protocol (LCP) Configuration Options
Link Control Protocol (LCP)offers different PPP encapsulation options, including the following:
PPP Authentication Methods
There are two methods of authentication that can be used with PPP links:
Frame Relay is still one of the most popular WAN services deployed over the past decade, and there’s a good reason for this—cost!
By default, Frame Relay is classified as a non-broadcast multi-access (NBMA) network,meaning it doesn’t send any broadcasts.
This provides global significance to DLCIs, allowing the Frame Relaycloud to work exactly like a LAN.
Active Inactive Deleted Static Local 1 0 0 0 Switched 0 0 0 0 Unused 0 0 0 0 DLCI = 100, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0 inputpkts 1300 output pkts 1270 in bytes 21212000 out bytes 21802000 dropped pkts 4 in pkts dropped 147 outpkts dropped 0 out bytes dropped 0 in FECN pkts 147 in BECN pkts 192 out FECN pkts 147 out BECN pkts 259 in DE pkts 0 out DE pkts 214 outbcastpkts 0 out bcast bytes 0 pvc create time 00:00:06, last time pvc status changed 00:00:06 Pod1R1#
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