cisco ccna global knowledge

cisco ccna global knowledge.MTU 17916 byes, BW 100 Kbit/secz DLY 50000 usee, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive not set set Tunnel source 200.200.200.1, destination 201.201.201.1Tunnel protocol/transport: GRE/IPIf both tunnel source and destination IP addresses are reachable at both ends, the status of the line protocol will be upo as shown hereWAN OverviewDon't forget that WANs run at the physical and data link layers. Be sure to know what the DCE and DTE are, their main functions, and the devices that are part of the DCEand DTE devices. WAN services such as Frame Relay and ATM using VC are used to connect to multiple sites over a single WAN interface. Be sure toknow the similarities and differences between the various data link layer encapsulations (such as HDLC and PPP) listed in Table 24.2. Synchronous connections use a serial interface. HDLC Don't forget that Cisco's HDLC implementation is proprietary: the frame header contains a proprietary type field. Know how to troubleshoot HDLC interfaces: inconsistent envelopeinconsistent package type, connected non-Cisco device, misconfigured IP address, not receiving a survival message response, this also applies to PPP troubleshooting.troubleshooting. Do not forget that when you execute the command show running-config, if the configuration of the synchronous serial interface does not include the command encapsulation,indicates that encapsulation is the default setting HDLC.