CLCOR Practice Exam 3 — 20 Questions

Question 1

You have a cluster with multiple nodes. You want to ensure that phones in the 'New York' office prioritize registration to a 'New York' subscriber. How do you implement this?

Accepted Answer

Create a CM Group with the local subscribers and assign it to the Device Pool.. A Cisco CallManager Group (CM Group) defines an ordered list of subscribers that devices in an associated Device Pool will register to. By creating a CM Group containing the New York subscribers and assigning it to the Device Pool used by New York phones, those phones will prefer the local subscriber for registration, keeping signaling local and reducing WAN dependency. This is the standard CUCM mechanism for call processing redundancy and locality.

Answer

Use a Route Group to point to the subscriber.

Answer

Assign the phones to a specific Region.

Answer

Configure the TFTP server address in the phone.

Question 2

Which component in the Cisco Collaboration architecture provides the initial configuration files (XML) to an IP phone upon registration?

Accepted Answer

TFTP Service. The Cisco TFTP service, running on Cisco Unified Communications Manager, is responsible for serving XML configuration files, phone firmware, and other provisioning files to IP phones during registration. When a phone boots, it requests its SEP<MAC>.cnf.xml file from the TFTP server, which contains its directory number, device pool, and cluster settings. Without TFTP, phones cannot complete registration.

Answer

CallManager Service

Answer

CTI Manager

Answer

Webex Control Hub

Question 3

You notice high latency on calls placed through a Local Gateway. Which metric should you inspect in the Webex Control Hub to confirm the issue is with the network path?

Accepted Answer

Network latency and jitter.. Network latency and jitter are key metrics that measure the quality of the network path. High latency indicates delay in packet delivery, while jitter measures variation in delay, both of which directly affect voice quality. Inspecting these metrics in Webex Control Hub can confirm if the issue is with the network path.

Answer

Calling license usage.

Answer

User status.

Answer

Device firmware version.

Question 4

A Cisco Unified Border Element (CUBE) is deployed between Cisco Unified Communications Manager and a SIP provider. The provider sends an INVITE with a Diversion header containing the original called number. You need to strip the Diversion header before sending the INVITE to Unified CM. Which configuration element should you use?

Accepted Answer

voice class sip-profiles with a sip-header Diversion remove rule applied on the outbound dial peer. To remove a SIP header such as Diversion, you must use a voice class sip-profiles with a sip-header command that specifies the header name and the action. The profile is then applied to the outbound dial peer so that the header is stripped from the INVITE before it is sent to the next hop. This is the standard method on CUBE.

Answer

dial-peer voice with the diversion-header disable command

Answer

voice class uri with a diversion pattern to match and block the header

Answer

voice service voip with the sip-header Diversion remove command

Question 5

You have configured a Cisco Unified CM Route List with two Route Groups: one containing a SIP trunk to Provider A and another containing a SIP trunk to Provider B. You want calls to be attempted to Provider A first, and only if that fails, to Provider B. Which Route List configuration ensures this behavior?

Accepted Answer

Set the Route List's distribution algorithm to Top Down and ensure the Route Group for Provider A is listed first.. To route calls to Provider A first and then Provider B only on failure, the Route List must use the Top Down distribution algorithm and list the Route Group for Provider A before Provider B. Top Down tries each Route Group in order, providing sequential failover. Other algorithms like Circular or Longest Idle do not provide this strict primary/secondary behavior.

Answer

Set the Route List's distribution algorithm to Broadcast and ensure the Route Group for Provider A is listed first.

Answer

Set the Route List's distribution algorithm to Circular and ensure the Route Group for Provider A is listed first.

Answer

Set the Route List's distribution algorithm to Longest Idle and ensure the Route Group for Provider A is listed first.

Question 6

Which protocol is required for the Webex Hybrid Directory Connector to communicate with on-premises Active Directory?

Accepted Answer

LDAP. The Webex Hybrid Directory Connector synchronizes user data from on-premises Active Directory to the Webex cloud, and it uses LDAP (Lightweight Directory Access Protocol) to query and read directory information from Active Directory. LDAP is the standard protocol for accessing and maintaining distributed directory information services.

Answer

XML

Answer

SIP

Answer

SNMP

Question 7

What is the primary benefit of the 'Webex Edge' strategy?

Accepted Answer

It optimizes the quality and reliability of Webex traffic.. Webex Edge is a set of hybrid options that let enterprises leverage their existing on-premises infrastructure and network to improve the quality, reliability, and manageability of Webex traffic. By peering Webex traffic through the customer's own network or dedicated connections rather than the public internet, latency and jitter are reduced, and the customer gains visibility and control. It does not replace the Webex cloud — it optimizes how traffic reaches it.

Answer

It allows you to use your own cloud hosting.

Answer

It removes the need for user authentication.

Answer

It eliminates the need for internet access.

Question 8

Which TWO tasks must be performed when setting up Webex Hybrid Calendar service with Microsoft Exchange?

Accepted Answer

Grant the service account ApplicationImpersonation rights. Option D is correct because the Webex Hybrid Calendar service connects to Microsoft Exchange on-premises via Exchange Web Services (EWS) using a dedicated service account, and that account must be granted the ApplicationImpersonation management role so it can act on behalf of users to read and manage their calendar data. Option E is correct because the Hybrid Calendar service must be activated and configured in Control Hub (the Webex administrative portal), where you enable the service and supply the Exchange environment details and service account credentials that tie the on-premises deployment to the cloud service. Options A, B, and C are incorrect: no dedicated DNS zone for Exchange is required, Hybrid Calendar does not use a SIP trunk between Exchange and Webex, and no H.323 gateway in the DMZ is involved since the integration relies on HTTPS/EWS rather than telephony signaling.

Answer

Create a dedicated DNS zone for Exchange

Answer

Configure a SIP trunk between Exchange and Webex

Answer

Install an H.323 gateway in the DMZ

Question 9

You are monitoring RTP traffic using a protocol analyzer. You observe that the Payload Type field in the RTP header is set to 0. Which codec is currently in use?

Accepted Answer

G.711 PCMU. In the RTP header, the Payload Type (PT) field value of 0 indicates the use of the G.711 PCMU (μ-law) codec. This is defined in RFC 3551, which assigns static payload type 0 to PCMU. Therefore, the correct answer is G.711 PCMU.

Answer

G.729

Answer

Opus

Answer

G.711 PCMA

Question 10

You are designing a dial plan with a centralized PSTN egress. What must you configure to ensure that local extensions can be dialed directly across sites?

Accepted Answer

A CSS that includes all site-specific partitions.. In a centralized PSTN egress design, each site's extensions reside in site-specific partitions. To allow any site to dial another site's extensions directly, the calling devices need a Calling Search Space (CSS) that includes all site-specific partitions. This enables the dial plan to match the dialed extension in the appropriate partition and route the call internally.

Answer

A shared device pool.

Answer

A translation pattern for each extension.

Answer

A route pattern that includes all extensions.

Question 11

A collaboration administrator is configuring a new site in Cisco Unified Communications Manager. The site has a 2 Mbps WAN link, and the administrator wants to prevent more concurrent G.711 calls than the link can support by defining the maximum audio bandwidth allowed. Which configuration element in Cisco Unified Communications Manager should the administrator configure?

Accepted Answer

Location. Locations in Cisco Unified Communications Manager are the call admission control mechanism for hub-and-spoke WAN designs, tracking aggregate audio and video bandwidth per site. Assigning devices to a Location with a defined maximum audio bandwidth causes CUCM to deny calls that would exceed the limit, which is precisely what the administrator needs to protect a 2 Mbps link from oversubscription.

Answer

SIP Profile

Answer

Device Pool

Answer

Region

Question 12

Which tool can be used to perform a bulk import of users and devices into CUCM?

Accepted Answer

Bulk Administration Tool (BAT). The Bulk Administration Tool (BAT) is specifically designed for bulk operations in Cisco Unified Communications Manager (CUCM), including importing users and devices. It allows administrators to add, update, or delete large numbers of records using CSV files, and it validates the data before insertion. BAT is the only tool among the options that provides this bulk import capability natively within CUCM.

Answer

Cisco Unified Reporting

Answer

Dialed Number Analyzer

Answer

Cisco Prime Collaboration

Question 13

A Cisco IOS XE voice gateway is configured with two POTS dial peers pointing to the same FXO port. Dial peer 10 matches destination pattern 911, and dial peer 20 matches destination pattern 9T. An inbound PSTN call arrives and is matched to a VoIP dial peer that forwards it to the gateway's FXO trunk. Which dial peer will the gateway use for the outbound POTS leg, and why?

Accepted Answer

Dial peer 10, because the most specific match (longest explicit digit string) is selected before the wildcard pattern.. Dial-peer matching on Cisco IOS voice gateways uses a specificity comparison: an exact digit string outranks a pattern containing wildcards. Because 911 is fully explicit and 9T contains the T wildcard, the gateway selects the peer with destination pattern 911 for the outbound POTS leg. This behavior lets engineers attach distinct settings, such as different trunk groups or calling-party transformations, to emergency calls while still allowing all other dialed numbers to use the general pattern.

Answer

Neither dial peer is selected; the gateway rejects the call because two POTS peers cannot share the same voice port.

Answer

Dial peer 20, because the gateway selects the peer with the lowest preference value configured under the dial peer.

Answer

Dial peer 20, because wildcard patterns always take precedence over literal patterns to allow flexible routing.

Question 14

You are designing a Cisco Collaboration deployment for a hospital where 911 calls must always be routed to the nearest Public Safety Answering Point (PSAP) based on the physical location of the calling device. The hospital has multiple buildings across a campus, and wireless IP phones (Cisco 8821) are used by nurses who roam between buildings. Which CUCM feature should you implement to ensure that emergency calls are routed with the correct location information?

Accepted Answer

Cisco Emergency Responder (CER) integrated with CUCM. Cisco Emergency Responder is the dedicated solution for E911 location tracking in Cisco Collaboration. It integrates with CUCM and network infrastructure to map devices to emergency response locations. Device Mobility, SRST, and ELCAC serve different purposes and do not provide the required location granularity for emergency calls.

Answer

Enhanced Location Call Admission Control (ELCAC) in CUCM

Answer

Cisco Unified Survivable Remote Site Telephony (SRST)

Answer

Device Mobility in Cisco Unified Communications Manager

Question 15

A Cisco Unified Border Element (CUBE) is deployed between Cisco Unified Communications Manager (CUCM) and a SIP service provider. The provider sends an INVITE with a Diversion header containing a redirecting number. The CUBE must pass the redirecting number to CUCM in the History-Info header instead of the Diversion header. Which SIP profile configuration on CUBE accomplishes this?

Accepted Answer

request INVITE sip-header Diversion copy-to History-Info. To convert a Diversion header to History-Info on CUBE, a SIP profile is used with the command request INVITE sip-header Diversion copy-to History-Info. This copies the value from the incoming Diversion header into a new History-Info header in the outbound INVITE. This ensures CUCM receives the redirecting number in the header it expects, facilitating proper call routing and display.

Answer

request INVITE sip-header Diversion

Answer

response INVITE sip-header Diversion copy-to History-Info

Answer

request INVITE sip-header History-Info copy-to Diversion

Question 16

You need to ensure that the Webex Hybrid Calendar service can access an Exchange 2019 environment. Which authentication method is recommended by Cisco for this deployment?

Accepted Answer

OAuth 2.0. Cisco recommends OAuth 2.0 for Hybrid Calendar with Exchange 2019 because Microsoft has deprecated Basic Authentication for EWS and modern security baselines require token-based auth. OAuth 2.0 allows the Calendar Connector to authenticate via Microsoft Entra ID app registration without storing user credentials. This is the supported and future-proof method for Exchange 2019 deployments.

Answer

Digest Authentication

Answer

Basic Authentication

Answer

Kerberos Constrained Delegation

Question 17

A collaboration engineer is designing a SIP trunk between Cisco Unified Communications Manager (CUCM) and Cisco Unified Border Element (CUBE). The engineer must ensure that calls are routed correctly and that CUCM can send calls to CUBE. Which element should be configured on CUCM to point to CUBE as the next hop for calls destined to the ITSP?

Accepted Answer

SIP trunk configured on CUCM with destination address of CUBE. To route calls from CUCM to CUBE, you configure a SIP trunk on CUCM with the destination address of CUBE. This trunk is then referenced by a route group, route list, and route pattern. When a call matches the route pattern, CUCM sends the call to CUBE via the SIP trunk. The trunk itself is the element that points to CUBE as the next hop.

Answer

Translation pattern that rewrites the called number to CUBE's IP address

Answer

H.323 gateway configured on CUCM with destination address of CUBE

Answer

Route group with CUBE as the only member

Question 18

A Cisco Unified CM administrator is troubleshooting a call that fails with a 'No Route to Destination' cause code. The called number is 2001, which is an internal extension on a remote cluster. The local cluster has a SIP trunk to the remote cluster and a route pattern of 2XXX pointing to that trunk. The SIP trunk is up, but the call fails. What is the most likely cause?

Accepted Answer

The route pattern is not assigned to a partition that is included in the calling search space of the dialing device.. The most likely cause is that the route pattern 2XXX is in a partition that is not included in the calling search space of the dialing device. Without the partition in the CSS, Unified CM cannot match the pattern, resulting in 'No Route to Destination'. Verifying the device's CSS and partition assignments resolves this issue.

Answer

The remote cluster is not configured with a route pattern for the local cluster, so the call is rejected.

Answer

The SIP trunk is not configured with a calling search space that includes the partition of the route pattern.

Answer

The SIP trunk is not registered to the remote cluster, so the call cannot be routed.

Question 19

What is the purpose of the 'Webex Service' account in Active Directory when using Directory Connector?

Accepted Answer

To read directory objects for synchronization.. The Webex Service account in Active Directory is used by Directory Connector to read (bind and query) directory objects such as users, groups, and attributes for synchronization to Webex. It requires read permissions on the directory partitions being synced. This service account is the identity Directory Connector uses to authenticate to AD and pull the data needed for user provisioning.

Answer

To encrypt the synchronization traffic.

Answer

To manage the user's email password.

Answer

To bypass the firewall.

Question 20

A network engineer is configuring a QoS policy on a Cisco IOS XE router for a collaboration deployment. The engineer needs to ensure that voice traffic is placed in a low-latency queue and that the queue has a strict priority, but also wants to limit voice traffic to 1 Mbps to prevent starvation of other traffic. Which queuing mechanism should be used?

Accepted Answer

Low Latency Queuing (LLQ). Low Latency Queuing (LLQ) is the correct mechanism because it provides a strict priority queue for voice traffic while also allowing a bandwidth limit via the priority command. This ensures that voice packets are serviced first, minimizing latency and jitter, but the policer prevents voice from consuming all bandwidth and starving other traffic. CBWFQ lacks strict priority, WRED is for congestion avoidance, and FIFO is not suitable for real-time traffic.

Answer

Class-Based Weighted Fair Queuing (CBWFQ)

Answer

First-In, First-Out (FIFO) queuing

Answer

Weighted Random Early Detection (WRED)