These are the questions most candidates get wrong. They require connecting multiple concepts, reading tricky output, or knowing edge-case behaviour that isn't on most study cards. Practising them trains you to operate under uncertainty — a necessary skill on the real exam.
Start Scenario PracticeA user is unable to receive incoming PSTN calls via a Webex Calling Local Gateway. You observe that the INVITE from the provider reaches the CUBE, but the CUBE sends a 403 Forbidden. What is the most likely cause?
Explanation: A 403 Forbidden response from the CUBE indicates that the incoming INVITE is being rejected due to a dial peer mismatch. The incoming dial peer is responsible for matching incoming calls and applying the correct configuration; if it is missing or misconfigured, the CUBE cannot route the call and returns 403.
When using 'Call Pickup', how does a user pick up a call that is ringing on another phone in the same pickup group?
Explanation: Call Pickup allows a user to answer a call ringing on another phone in the same pickup group by pressing the 'Pickup' softkey (or dialing the pickup group code). The softkey triggers the Call Pickup feature, which redirects the ringing call to the user's phone. This is a standard CUCM feature for group call answering.
A CUBE is configured to connect to a SIP provider that uses a non-standard SIP port (not 5060) for signaling. The CUBE must send outbound INVITEs to this provider on port 5080. Which configuration is required on the outbound dial-peer to achieve this?
Explanation: For a SIP dial-peer, the destination IP address and port are configured using the 'session target ipv4:<ip>:<port>' command. This directs outbound SIP signaling to the specified IP and port. In this scenario, the provider uses port 5080, so the session target must include that port. Other commands like destination-pattern or outbound-proxy serve different purposes and would not correctly direct the INVITE to the non-standard port.
A collaboration engineer is deploying a new branch office with Cisco Unified Communications Manager and wants to ensure that voice traffic is marked with the appropriate DSCP value. The service provider requires that voice bearer traffic use EF ( Expedited Forwarding). Which DSCP value should be configured on the IP phones for voice media?
Explanation: Voice bearer traffic should be marked with EF (Expedited Forwarding, DSCP 46) to ensure low latency, jitter, and loss. This is a standard recommendation and is often required by service providers. The IP phone configuration must set the voice media DSCP to EF, while call signaling typically uses CS3.
You are deploying Webex Hybrid Data Security (HDS). After deploying the virtual machines for the HDS nodes, you find they are not appearing in Control Hub. What is the first step you should take to troubleshoot the registration?
Explanation: When HDS nodes do not appear in Control Hub, the first troubleshooting step is to check the local log files on the HDS node via the CLI. The logs will show whether the node successfully reached the Webex cloud, whether the registration token was accepted, and whether there are certificate or connectivity errors. This is the fastest way to identify the root cause before making configuration changes.
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Practice all Hard Difficulty QuestionsThese are the questions most candidates get wrong. They require connecting multiple concepts, reading tricky output, or knowing edge-case behaviour that isn't on most study cards. Practising them trains you to operate under uncertainty — a necessary skill on the real exam. These appear throughout the CLCOR and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the CLCOR. Practicing each scenario type ensures you're ready for any format.
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