CLCOR Practice Test 18 — 15 Questions

Question 1

A company is deploying Cisco Unified Communications Manager in a centralized call processing model with remote branches connected via a WAN. The network team wants to ensure that if the WAN link fails, IP phones at the branch can still make calls to the PSTN. Which solution should be implemented at the branch?

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

Accepted Answer

Cisco Unified Survivable Remote Site Telephony (SRST) on the branch router. SRST is the designed solution for branch office survivability in a centralized CUCM deployment. When the WAN fails, the branch router with SRST assumes call control, enabling IP phones to register and make PSTN calls via local gateways. This maintains voice services during outages without requiring a full CUCM cluster at the branch.

Answer

Cisco Expressway-C and Expressway-E for Mobile and Remote Access (MRA)

Answer

A second CUCM subscriber at the branch office

Answer

Cisco Unified Communications Manager Express (CME) on the branch router

Question 2

Which design principle must be followed when implementing a centralized call processing deployment with remote branch offices connected via a WAN?

Accepted Answer

Enable SRST on the local branch gateway to handle call processing during a WAN outage.. In a centralized call processing deployment, branch offices rely on the central CUCM for call control. If the WAN link fails, branch phones lose registration and cannot make or receive calls. SRST on the local branch gateway provides fallback call processing, allowing basic PSTN calling during WAN outages. This is a fundamental design requirement for centralized deployments with remote sites.

Answer

Deploy a dedicated CUCM node in every branch office.

Answer

Configure H.323 gateways at each site to communicate directly with all remote phones.

Answer

Use RSVP to guarantee bandwidth across the WAN for signaling.

Question 3

Where do you define the default dial plan for a new CUCM cluster?

Accepted Answer

You create partitions, CSS, and route patterns manually.. In Cisco Unified Communications Manager (CUCM), there is no single 'default dial plan' configuration page. A dial plan is built from three core components: partitions (which group route patterns), calling search spaces (CSS) (which define the order of partitions a device can search), and route patterns (which match dialed digits and determine the next hop). These must be manually created and configured by the administrator. CUCM does not ship with a pre-built default dial plan, so option C correctly describes the required manual process.

Answer

System > Dial Plan Configuration

Answer

Service Parameters

Answer

Enterprise Parameters

Question 4

A network engineer is troubleshooting a Cisco IP Phone 7841 that fails to register with CUCM. The phone displays 'Configuring IP' and then 'Registering'. The engineer verifies that the phone has obtained an IP address and can ping the TFTP server. Which protocol does the phone use to download its configuration file from the TFTP server?

Accepted Answer

TFTP. Cisco IP Phones use TFTP to download their configuration files from the CUCM TFTP server. This process occurs after the phone obtains an IP address and discovers the TFTP server via DHCP Option 150. The configuration file contains the necessary information for the phone to register with CUCM, including the CUCM server list. TFTP is the standard protocol for this step.

Answer

FTP

Answer

HTTPS

Answer

HTTP

Question 5

A branch office has a limited bandwidth link. You need to ensure that no more than 5 calls can be made across the WAN at once. What should you configure?

Accepted Answer

Define a Location and set the Audio Bandwidth limit.. CUCM Locations implement Call Admission Control (CAC) by defining the total audio/video bandwidth available between locations. Setting the Audio Bandwidth limit on a Location (e.g., to a value that supports only 5 G.711 calls, roughly 400 kbps plus overhead) ensures CUCM denies the 6th call across the WAN. Locations are assigned to devices via Device Pools, and the bandwidth between any two locations is calculated based on the configured limits.

Answer

Modify the Region setting.

Answer

Create a CSS to block calls.

Answer

Configure a Route Filter.

Question 6

A network administrator is configuring QoS on a Cisco IOS router for a collaboration deployment. The administrator needs to ensure that voice control traffic, such as H.225 and H.245 signaling, is marked with the appropriate DSCP value. According to Cisco best practices, which DSCP value should be used for call signaling traffic?

Accepted Answer

CS3 (24). The correct DSCP for call signaling is CS3 (24). This marking ensures that signaling traffic is prioritized above data but below voice bearer, which is essential for maintaining call quality. Voice bearer uses EF (46), while signaling uses CS3. This separation allows the network to treat real-time voice media with the highest priority and signaling with the next highest, ensuring that call setup and control messages are not delayed during congestion.

Answer

AF31 (26)

Answer

EF (46)

Answer

AF41 (34)

Question 7

A company has deployed Cisco Webex Hybrid Calendar Service with Exchange 2019 on-premises. Users report that scheduled Webex meetings are not appearing on their calendars, and the connector shows a 'Connected' status but no calendar events are being processed. Which action should be taken to resolve this issue?

Accepted Answer

Verify that the impersonation account has the required permissions to access user mailboxes and that the Exchange Web Services (EWS) URL is correctly configured.. Hybrid Calendar Service relies on an impersonation account with ApplicationImpersonation rights and a correctly configured EWS URL. Even if the connector shows 'Connected', missing permissions or an incorrect EWS URL can prevent calendar processing. Verifying these settings ensures the connector can access mailboxes and process meeting invitations.

Answer

Reinstall the Hybrid Calendar Service connector on the Expressway-C because the certificate may have expired.

Answer

Restart the Cisco Webex Hybrid Calendar Service connector service on the Expressway-C.

Answer

Change the Webex site URL in Control Hub to match the on-premises Exchange domain.

Question 8

A Cisco Unified Communications Manager cluster is using a SIP trunk to an ITSP. The ITSP sends calls to the enterprise with a +1 prefix, but the enterprise dial plan uses 10-digit numbers without the country code. You need to strip the +1 from the incoming calling and called numbers before they are presented to the dial plan. Where should you configure this translation?

Accepted Answer

Configure Called Party Transformation and Calling Party Transformation patterns on the SIP trunk and assign them to the trunk's inbound settings.. Incoming calls from a SIP trunk can be modified using Calling Party Transformation and Called Party Transformation patterns, which are applied to the trunk's inbound settings. These patterns strip the +1 prefix before the numbers are processed by the dial plan, ensuring the 10-digit format is used. This approach is native to CUCM and keeps digit manipulation scoped to the specific trunk.

Answer

Create a Translation Pattern in the Calling Search Space applied to the SIP trunk's incoming calls.

Answer

Modify the Route Group's distribution algorithm to remove the prefix during digit analysis.

Answer

Create a SIP Normalization Script that rewrites the SIP INVITE headers on the trunk.

Question 9

Which component is required to synchronize users from an on-premises Active Directory to the Webex Cloud?

Accepted Answer

Cisco Directory Connector. Cisco Directory Connector is the on-premises application that synchronizes users from Active Directory to Webex Cloud. It is specifically designed for directory synchronization in Webex Hybrid Services, ensuring user accounts are consistent between on-premises AD and the cloud.

Answer

Webex Calling Admin Console

Answer

Expressway-C

Answer

Cisco Webex HDS

Question 10

You are designing a Cisco Unified Communications Manager (CUCM) dial plan for a multinational company. The company has offices in North America, Europe, and Asia. Each region has its own PSTN gateway and dial plan requirements. The customer wants to minimize dial plan complexity and ensure that users can dial local numbers as they are accustomed to. Which approach should you recommend?

Accepted Answer

Deploy a centralized dial plan with location-specific partitions and calling search spaces (CSS) to provide regional dialing habits.. A centralized dial plan with partitions and calling search spaces allows each region to have its own dialing patterns while maintaining a single CUCM cluster. This reduces complexity by centralizing administration, but provides the flexibility for local dialing habits. The other options either do not meet the requirement or introduce unnecessary complexity.

Answer

Use a single dial plan with no partitions and rely on translation patterns to handle regional differences.

Answer

Implement separate CUCM clusters for each region to isolate dial plans.

Answer

Implement a single global dial plan with a uniform dialing pattern for all regions.

Question 11

You are configuring a Cisco IOS XE voice gateway to route inbound SIP calls to different dial peers based on the Request-URI domain. You want to match calls destined to 'example.com' to a specific dial peer. Which configuration element should you use to achieve this?

Accepted Answer

voice class uri 10 sip. The correct approach is to define a voice class URI that specifies the domain pattern, then reference it in an inbound dial peer using 'incoming uri request' or 'incoming uri via'. This allows the gateway to inspect the SIP Request-URI and select the appropriate dial peer. Other options like translation profiles or codec classes operate after dial-peer matching and cannot influence the selection.

Answer

translation-profile

Answer

dial-peer voice 100 voip

Answer

voice-class codec

Question 12

Which TWO of the following are valid components of a Cisco IOS voice gateway configuration?

Accepted Answer

Dial-peers. Dial-peers (B) are a core component of Cisco IOS voice gateway configuration, defined globally with the dial-peer voice command to match inbound/outbound call legs and specify destination patterns, sessions targets, and codecs. Voice translation rules (D) are also valid IOS voice gateway components, configured with the voice translation-rule and voice translation-profile commands to manipulate calling/called numbers via regex. In contrast, a phone button template (A) is a Cisco Unified Communications Manager (CUCM) configuration element applied to IP phones, not an IOS gateway feature. A CUCM route pattern (C) is configured on CUCM to route calls toward gateways or trunks, not on the IOS gateway itself. A device pool (E) is likewise a CUCM construct that groups devices for common settings such as region, date/time, and softkey templates, and is not part of IOS gateway configuration.

Answer

Phone button template

Answer

CUCM route pattern

Answer

Device pool

Question 13

A collaboration engineer is designing a CUCM cluster with two nodes: a publisher and a subscriber. The engineer must ensure that the cluster can support 2500 IP phones and that call processing continues if the publisher fails. Which statement accurately describes the design requirement?

Accepted Answer

The subscriber can register up to 2500 phones, and if the publisher fails, the subscriber continues call processing but database changes are not possible until the publisher is restored.. In a two-node CUCM cluster, the subscriber can register up to 2500 phones and handle call processing. If the publisher fails, the subscriber continues to process calls, but database replication and configuration changes are halted until the publisher is back online. This design provides call processing redundancy but not database redundancy without additional nodes.

Answer

The cluster can support up to 2500 phones per node, but only if the publisher and subscriber are in the same LAN.

Answer

The subscriber must be configured to handle all call processing, and the publisher should only be used for database and TFTP services.

Answer

The publisher must be dedicated solely to database replication and not perform call processing.

Question 14

A user reports that their calls are failing when they roam to a different physical office site. You observe that the device is registered to the primary CUCM cluster but the Location-based CAC is blocking the call. What is the most likely cause?

Accepted Answer

The device is not assigned to a Device Pool with the correct Location configured for the new site.. Location-based Call Admission Control (CAC) in Cisco Unified Communications Manager (CUCM) uses the Location configured in the Device Pool to determine available bandwidth between sites. If a device roams to a different physical site but remains in a Device Pool with the original Location, the CAC will incorrectly calculate bandwidth as if the device is still at the original site, potentially blocking calls due to insufficient bandwidth. The most likely cause is that the device is not assigned to a Device Pool with the correct Location for the new site.

Answer

The Region setting in the Device Pool has a lower bitrate than the required codec.

Answer

The device must be re-registered to a local subscriber instead of the primary cluster.

Answer

The Calling Search Space is not configured to allow inter-site dialing.

Question 15

A network designer is planning a centralized call processing deployment with 20 remote sites. Each site has 50 IP phones and uses G.711 for internal calls. The designer must ensure that calls between sites use G.729 to conserve WAN bandwidth, but calls within a site use G.711. Which CUCM configuration element should be used to achieve this?

Accepted Answer

Region. Regions are the correct configuration element to enforce codec selection between sites. By defining regions and inter-region relationships with G.729 as the maximum codec, while allowing G.711 within a region, the designer ensures that inter-site calls use the lower-bandwidth codec. This directly meets the requirement without relying on call admission control.

Answer

Location

Answer

Device Pool

Answer

Media Resource Group List (MRGL)