Question 5) Cisco Certified Network Associate

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SubObjective: Evaluate key characteristics of WANs

Single Answer Multiple Choice

After configuring Frame Relay, which show command can you use to display the status of each configured connection, the traffic statistics, and the number of BECN and FECN packets received by the router?

A. show frame-relay lmi
B. show frame-relay pvc
C. show frame-relay map
D. show interfaces serial

Answer:
B. show frame-relay pvc

Tutorial:
The ‘show frame-relay pvc’ command displays the status of each configured connection as well as traffic statistics. You can also view the number of BECN and FECN packets received by the router. In addition, it displays whether the interface is a DTE or DCE (DCEs are usually the CSU/DSU), the DLCI number, the usage of the DLCI (local usually), the status of the PVC, and the interface of the PVC.

The ‘show interfaces serial’ command displays information about encapsulation and the LMI and DLCI used for local management. It will display the encapsulation as Frame-Relay, the keepalive interval, the DLCI number, the LMI type, the network address, the MTU, the bandwidth, and the queuing strategy. In addition, it will display whether the line and protocol are up on the interface, whether the loopback is set, whether the interface is a DTE or a DCE (DCEs are usually the CSU/DSU), and many other details about the interface.
NOTE: Since the Cisco IOS allows you to enter only enough letters to make the command unambiguous, to display information about just serial interface 0, you can also use ‘show interface s0.’

The ‘show frame-relay lmi’ command displays LMI traffic statistics such as the LMI type on the interface and the number of status messages between the router and the Frame Relay switch. In addition, it displays whether the interface is a DTE or DCE (DCEs are usually the CSU/DSU).
The ‘show frame-relay map’ command displays the Network-layer address and associated DLCI for each remote destination. This command displays the static mappings as well as mappings learned from inverse ARP. Its output is similar to the following:

Router#show frame-relay map

Serial1 (up) : ip 10.0.0.2 dlci 100 (0x64, 0x1840), dynamic, broadcast, status defined, active

For more information see show Commands for Frame Relay Traffic Shaping at
http://www.cisco.com/warp/public/125/framerelay_ts_cmd.html#first

Reference:
1. ICND Student Guide v2.1 – Volume 2 – Configuring Frame Relay – Verifying Basic Frame Relay Operations

These questions are derived from the Self Test Software Practice Test for Cisco exam 640-801 – Cisco Certified Network Associate (single-exam option)

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