350-801 Question #472: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Users at a company located in New York cannot place calls. The New York gateway is configured with a T1 ISDN PRI card with 24 channels. The engineer runs the show isdn status command and receives output. Which action must the engineer take to resolve the issue?

Options

• AIncrease the number of timeslots in the controller t1 interface
• BChange the switch type on the ISDN card to primary-5ess
• CIssue the no shut command into the controller t1 interface
• DChange the card type from T1 to E1

Explanation

If users cannot place calls and the show isdn status command indicates the ISDN interface is not operational, the engineer should issue the no shut command on the controller t1 interface. This command administratively enables the interface, bringing it online.

Common mistakes.

• A. Increasing the number of timeslots is related to capacity planning, not resolving an administratively down interface blocking all calls.
• B. Changing the switch type is a configuration setting that should match the telco provider; it's unlikely to be the cause of an entirely non-functional ISDN link if it was previously working or if the primary issue is a shut interface.
• D. Changing the card type from T1 to E1 is physically impossible and fundamentally changes the signaling, which is not a solution for an administratively down T1 interface.

Concept tested. ISDN PRI interface troubleshooting

Reference. https://www.cisco.com/c/en/us/td/docs/ios/dial/configuration/guide/dial-c/dclpri.html

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