CLCOR Practice Test 19 — 15 Questions

Question 1

A collaboration administrator needs to provide users with the ability to make and receive PSTN calls through Webex Calling without deploying any on-premises gateways or maintaining a separate carrier contract. Which Webex Calling PSTN option should the administrator choose?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Cisco PSTN. Cisco PSTN is the only Webex Calling PSTN option that is entirely cloud-delivered by Cisco, with no on-premises gateway and no separate carrier contract needed. It provides dial tone, emergency calling, and number management directly through the Webex Calling cloud, making it the correct choice for an organization that wants to avoid on-premises PSTN infrastructure and additional carrier agreements.

Answer

Webex Edge for Calling

Answer

Local Gateway

Answer

Cloud Connected PSTN (CCP)

Question 2

In CUCM, what is the purpose of the 'Calling Search Space' (CSS)?

Accepted Answer

To define which partitions a device can access.. A Calling Search Space is an ordered list of partitions that a device or line is allowed to search when matching dialed digits. It effectively defines the class of service for that device by determining which route patterns, translation patterns, and directory numbers it can reach. Without a CSS, a device has no partitions to search and cannot complete any calls beyond its own registered DN.

Answer

To define the codec used for calls.

Answer

To define the physical location of the device.

Answer

To define the bandwidth limit of a call.

Question 3

A user reports that when they dial an internal extension, they hear a fast busy tone. The administrator checks the dialed number and confirms it exists in the CUCM database. Which configuration element should the administrator verify first to resolve the fast busy tone?

Accepted Answer

The partition and calling search space of the calling device. A fast busy tone on an internal call usually means CUCM cannot route the call because the dialed number is not in a partition that the calling device's calling search space can access. Even if the directory number exists, it must be in a partition listed in the calling device's CSS. The other options relate to device settings, locations, or media resources, which do not prevent dialing an internal number. Therefore, checking the CSS and partition is the correct first step.

Answer

The device pool assigned to the called device

Answer

The media resource group list assigned to the calling device

Answer

The location configuration for both devices

Question 4

You are implementing a centralized dial plan. You have multiple sites, each with local PSTN gateways. How can you ensure that an emergency call from a specific site is always routed to the local PSTN gateway of that site?

Accepted Answer

Use site-specific partitions and assign the local gateway to a CSS that includes that partition.. Emergency calls (911/999/112) must always egress through the PSTN gateway physically closest to the caller so that the correct Public Safety Answering Point (PSAP) is reached. The reliable way to enforce this in a centralized dial plan is to place each site's local gateway in a site-specific partition, then assign each site's devices a Calling Search Space (CSS) that includes only that site's partition. This guarantees that when a device dials the emergency number, the matching route pattern in the local partition is the one that gets used.

Answer

Use Transformation Masks on the device.

Answer

Configure the location in the device pool to match the site.

Answer

Create a separate CUCM cluster for each site.

Question 5

A company is deploying Webex Hybrid Directory Service to synchronize on-premises Active Directory users to Webex Control Hub. The administrator has installed the connector on a Windows Server 2019 machine and configured the required DNS SRV record. During the connector setup, the administrator is prompted to provide credentials for a service account. Which of the following must be true about this service account?

Accepted Answer

It must have read access to the Active Directory partitions containing the users to be synchronized.. The Hybrid Directory Service connector authenticates to Active Directory using a service account that must be able to read the directory partitions containing the users to be synchronized. No administrative write privileges or special group memberships are required. This least-privilege model ensures the connector can perform its synchronization task without exposing the environment to unnecessary risk.

Answer

It must be a member of the Enterprise Admins group to synchronize users across all domains in the forest.

Answer

It must be a member of the Domain Admins group in Active Directory.

Answer

It must be a Microsoft Exchange mailbox-enabled account with a valid SMTP address.

Question 6

A collaboration engineer is configuring Webex Hybrid Call Service Connect to integrate an on-premises Cisco Unified Communications Manager (CUCM) cluster with Webex. The engineer has deployed Expressway-C and Expressway-E in the enterprise and has enabled the Hybrid Call Service Connector on the Expressway-C. After configuration, users in Webex Teams cannot place calls to on-premises CUCM-registered endpoints. Which of the following is the most likely cause?

Accepted Answer

The Expressway-C does not have a valid certificate trusted by CUCM for the SIP TLS connection.. Hybrid Call Service Connect relies on a SIP TLS connection between Expressway-C and CUCM. For this connection to work, both sides must trust each other's certificates. If the Expressway-C certificate is not trusted by CUCM, the TLS handshake fails, and calls between Webex Teams and on-premises endpoints cannot be established. Verifying and importing the correct certificates is a critical troubleshooting step.

Answer

The Webex Teams users have not been assigned the Webex Calling license.

Answer

The CUCM cluster is not configured with a SIP trunk to the Expressway-C.

Answer

The Expressway-E is not configured with a public IP address and cannot reach the Webex cloud.

Question 7

When a call is made to a destination that matches multiple partitions in a user's CSS, how does CUCM determine which pattern to use?

Accepted Answer

Longest match rule.. Cisco Unified Communications Manager (CUCM) uses the longest match rule when a dialed number matches multiple patterns across the partitions in a calling search space (CSS). The system evaluates all patterns in the CSS partitions and selects the one with the most specific (longest) match to the dialed digits. This ensures that more specific dial plans take precedence over generic ones, which is critical for correct call routing.

Answer

The pattern configured first.

Answer

Random selection.

Answer

The pattern with the lowest partition index.

Question 8

A user reports that they cannot hold an active call when the Media Resource Group List (MRGL) is configured with a specific Transcoder. The CUCM trace shows 'Allocation Failure'. What is the most likely cause?

Accepted Answer

The MRG associated with the MRGL lacks the required Transcoder resource for the codec mismatch.. The 'Allocation Failure' in CUCM traces during a hold operation with a transcoder in the MRGL indicates that CUCM could not find a usable transcoder resource to satisfy the media requirement. The most likely cause is that the Media Resource Group (MRG) referenced by the MRGL does not actually contain the transcoder needed for the codec mismatch, so the resource lookup fails and the hold (which may require renegotiation or MTP/transcoding) cannot complete.

Answer

The CUCM version does not support hardware transcoders.

Answer

The Transcoder device is registered but the MRGL priority is set to 0.

Answer

The device is using G.711 which requires a transcoder by default.

Question 9

Which THREE of the following are key features provided by a QoS policy-map?

Accepted Answer

Bandwidth reservation. A QoS policy-map is the component that applies actions to traffic classes, and bandwidth reservation (A) is a core action it can enforce, typically via the bandwidth or priority commands to guarantee a minimum or strict-priority share of link capacity. Traffic marking (B) is also a key policy-map action, using commands like set dscp or set cos to rewrite QoS bits so downstream devices can classify and treat packets consistently. Traffic policing (C) is another standard policy-map action, implemented with the police command to meter flows and drop or re-mark packets that exceed a committed rate. The remaining options do not belong: interface IP address assignment (D) is a Layer 3 interface configuration task, not a QoS policy-map function, and dynamic routing updates (E) are handled by routing protocols such as OSPF or EIGRP, not by QoS policy-maps.

Answer

Interface IP address assignment

Answer

Dynamic routing updates

Question 10

Which license type is required to manage Webex Calling services in Control Hub?

Accepted Answer

Webex Calling License. Managing Webex Calling services in Control Hub — configuring users, numbers, dial plans, and PSTN — requires a Webex Calling license assigned to the administrator and to the users being managed. The Webex Calling license is what entitles the organization to the calling service and unlocks the Calling configuration sections in Control Hub. Without it, the Calling tabs are unavailable or read-only.

Answer

Webex Meetings License

Answer

Webex Room Device License

Answer

Webex Messaging License

Question 11

What is the function of a 'Device Pool' in CUCM?

Accepted Answer

To group shared settings for devices.. A Device Pool in CUCM groups devices that share common settings such as region, date/time group, softkey template, SRST reference, and media resource group list. It simplifies bulk configuration by allowing administrators to apply these settings to many phones at once rather than per-device.

Answer

To define user permissions.

Answer

To manage media resources.

Answer

To control call routing.

Question 12

Which THREE of the following tasks are required to set up a basic SIP trunk in CUCM?

Accepted Answer

Create a SIP Trunk Security Profile. To set up a basic SIP trunk in CUCM, you must create a SIP Trunk Security Profile (option B), which defines the security settings such as device authentication mode, incoming/outgoing transport (TCP/UDP/TLS), and digest authentication for the trunk. You must also create a SIP Profile (option C), which defines SIP timers, normalization scripts, and header handling behavior applied to the trunk. Finally, you must create the SIP Trunk itself (option E), which binds the trunk to a device pool, calling search space, and associates the SIP Trunk Security Profile and SIP Profile. A Route Filter (option A) is used with route lists and route groups for digit manipulation and is not mandatory for a basic SIP trunk, and a Translation Pattern (option D) is used for number translation and is likewise not required for basic SIP trunk setup.

Answer

Create a Route Filter

Answer

Create a Translation Pattern

Question 13

You are configuring a Webex Calling environment for a customer that requires integration with an existing on-premises PBX using a Cisco Unified Border Element (CUBE). Which gateway type should you register to Webex Control Hub to enable this connectivity?

Accepted Answer

Local Gateway. Local Gateway is the correct answer because in Webex Calling, a Local Gateway is an on-premises CUBE (Cisco Unified Border Element) registered to Webex Control Hub that provides connectivity between Webex Calling and an existing on-premises PBX or PSTN. It is the specific gateway type designed for premises-based PSTN or PBX integration via CUBE. Registering the CUBE as a Local Gateway in Control Hub enables call routing between Webex Calling users and the on-premises PBX.

Answer

Cloud Connected PSTN Gateway

Answer

Webex Edge Connect Gateway

Answer

Virtual Gateway

Question 14

A user reports that when they dial an internal extension, they hear a fast busy tone. The administrator checks the CUCM configuration and finds that the user's phone is registered and the dialed extension exists. Which CUCM component is responsible for determining that the dialed digits are a valid internal extension and routing the call?

Accepted Answer

CallManager service. The Cisco CallManager service is the call control application that performs digit analysis and determines how to route calls. When a user dials an extension, the CallManager service checks for matching patterns and directory numbers. If no match is found or the call is rejected, the user hears a fast busy tone. Thus, the CallManager service is the correct component.

Answer

Cisco CTIManager service

Answer

Cisco TFTP service

Answer

Cisco IP Voice Media Streaming App service

Question 15

If a Translation Pattern is configured in CUCM, at what stage of the call processing does the digit manipulation occur?

Accepted Answer

Before the Route Pattern is matched.. Translation patterns in CUCM perform digit manipulation before the Route Pattern is matched. This allows the translation pattern to modify the dialed digits so that they match the appropriate route pattern, enabling correct routing. The manipulation occurs during the digit analysis phase, prior to route selection.

Answer

After the call is sent to the gateway.

Answer

At the device level during registration.

Answer

Only when the call fails to route.