CLCOR Practice Test 4 — 25 Questions

Question 1

A user's Cisco IP Phone 8841 is registered to Cisco Unified Communications Manager but cannot place calls to any internal or external numbers. The phone displays 'Registration Complete' but every call attempt results in a fast busy tone. Which configuration element is most likely missing or misconfigured for this phone?

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

Accepted Answer

The phone's Calling Search Space does not include the partitions containing the dialed numbers.. A registered phone that cannot place any calls typically has a Calling Search Space that lacks access to the partitions containing the dialed numbers. The CSS must include the partitions where directory numbers and route patterns reside. Without this, digit analysis fails and the phone receives a fast busy tone. Other settings like Region or security profile do not block call placement in this manner.

Answer

The phone's Device Security Profile is set to Non-Secure.

Answer

The phone's Network Locale is set to United States.

Answer

The phone's Device Pool is not assigned to a Region.

Question 2

When configuring CUBE for media flow-around, which command ensures the media goes directly between endpoints?

Accepted Answer

media flow-around. The 'media flow-around' command in CUBE configuration tells the Cisco Unified Border Element to leave the RTP media streams out of the signaling path, allowing endpoints to exchange media directly. This is the correct syntax for enabling media flow-around on CUBE. It is configured under the voice service voip or dial-peer context to control whether media is anchored or bypassed.

Answer

media pass-through

Answer

media-bypass

Answer

media flow-through

Question 3

What is the function of 'Cisco Unified Reporting' in a CUCM environment?

Accepted Answer

To generate cluster and system reports.. Cisco Unified Reporting is a CUCM administration interface that generates on-demand reports about the cluster, such as device counts, license usage, dial plan summaries, and system health snapshots. It is designed for reporting and troubleshooting, not real-time monitoring or configuration. It pulls data from the CUCM database and presents it in downloadable formats like PDF or CSV.

Answer

To monitor network bandwidth.

Answer

To manage real-time call logs.

Answer

To perform bulk configuration.

Question 4

You are troubleshooting a scenario where G.711 is being used instead of the expected Opus codec between two endpoints in the same region. What is the most likely cause in the CUCM configuration?

Accepted Answer

Audio Codec Preference List. The Audio Codec Preference List in CUCM defines the ordered list of codecs an endpoint will offer and accept during SIP/SDP negotiation. If Opus is not placed above G.711 (or is missing entirely) in the assigned codec preference list, the endpoints will fall back to G.711 even when both support Opus. Since both endpoints are in the same region, no location-based bandwidth constraint would force G.711, so the codec preference list is the most likely culprit.

Answer

Phone NTP settings

Answer

SIP Trunk Security Profile mismatch

Answer

Location-based bandwidth limit

Question 5

When using 'RSVP' for Call Admission Control (CAC), what happens if the available bandwidth on the path is less than the requested amount?

Accepted Answer

The call is blocked. With RSVP-based Call Admission Control, when a call's RSVP PATH/RESV signaling requests more bandwidth than is available on any link along the path, the router rejects the reservation and the call is blocked (denied). RSVP CAC is a deterministic admission control mechanism: if the requested bandwidth cannot be reserved, the call setup fails rather than proceeding with degraded quality. This ensures that admitted calls receive their guaranteed quality of service.

Answer

The call is placed but with a lower quality codec

Answer

The call is put on hold until bandwidth is available

Answer

The call proceeds, but marks the packets with Best Effort

Question 6

A collaboration engineer is deploying Webex Hybrid Calling with Cisco Unified Communications Manager (CUCM) as the call control. The engineer wants to provide PSTN access to Webex Calling users by leveraging the existing on-premises Cisco IOS Voice Gateway. Which solution should be implemented?

Accepted Answer

Cisco Unified Border Element (CUBE) with Local Gateway. Local Gateway is the correct hybrid PSTN solution when an organization wants to use its own on-premises CUBE for PSTN connectivity while using Webex Calling for call control. It enables Webex Calling to send PSTN-bound calls to the on-premises CUBE, which then routes them to the PSTN. This preserves existing gateway investments and is a supported deployment option in Webex Control Hub.

Answer

Cisco Unified Communications Manager (CUCM) SIP trunk directly to Webex Calling

Answer

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

Answer

Webex Calling PSTN calling plan from Cisco

Question 7

An engineer is troubleshooting one-way audio for calls traversing a Cisco IOS XE router with NAT between an internal CUCM cluster and an external SIP provider. Signaling completes, but RTP from the provider never reaches the internal phone. The engineer confirms the provider is sending media to the signaling address. Which technology should be enabled on the router to allow the correct media address to be signaled to the provider?

Accepted Answer

Application Layer Gateway for SIP. When SIP signaling crosses a NAT boundary, the SDP body often carries a private IP address that the far end cannot reach, producing signaling success but one-way or no audio. A SIP Application Layer Gateway on the Cisco IOS XE router inspects the SDP and rewrites the connection and media attributes to the translated public address, so the provider sends RTP to the correct destination and audio flows in both directions.

Answer

Media Termination Point

Answer

SIP Normalization and Transparency

Answer

RSVP

Question 8

Which DSCP value is recommended for Call Signaling traffic in a Cisco Unified Communications network?

Accepted Answer

CS3 (24). Cisco recommends DSCP CS3 (24) for call signaling traffic in a Unified Communications network, which includes SCCP, SIP, and H.323 signaling between endpoints and call control. CS3 provides a distinct per-hop behavior from voice bearer traffic, which uses EF (46). This separation lets QoS policies prioritize voice media above signaling while still protecting signaling from best-effort traffic.

Answer

AF31 (26)

Answer

EF (46)

Answer

AF41 (34)

Question 9

Which TWO of the following are valid methods to handle digit manipulation in CUCM?

Accepted Answer

Translation Pattern. Translation Pattern (C) is a valid digit-manipulation method in CUCM because it matches a dialed digit string in a partition and applies transformations such as discarding digits (Discard Digits), prefixing digits, or rewriting the called/calling number before the call is routed. Calling Party Transformation Pattern (E) is also valid because it specifically manipulates the calling-party number (and related presentation settings) on inbound or outbound calls by matching the calling number and applying prefix, strip, or transformation masks. Route Filter (A) is not a digit-manipulation tool; it is used with route lists and time schedules to filter which route groups or dial peers can be selected based on dial-peer tags, not to rewrite digits. Region Matrix (B) governs codec selection between regions for calls, not digit manipulation. Location Configuration (D) is used for call admission control and bandwidth allocation between locations, not for altering dialed digits.

Answer

Route Filter

Answer

Region Matrix

Answer

Location Configuration

Question 10

A network administrator is troubleshooting poor voice quality on a Cisco Unified Communications Manager cluster. The administrator suspects that the issue is related to the Differentiated Services Code Point (DSCP) value being used for voice bearer traffic. Which DSCP value is recommended by Cisco for voice bearer traffic to ensure it receives priority treatment in the network?

Accepted Answer

EF (Expedited Forwarding). Cisco recommends marking voice bearer traffic with EF (Expedited Forwarding), which is DSCP 46. This marking ensures that voice packets are placed in a low-latency queue and receive priority treatment across the network. Other DSCP values like AF31, CS3, and AF41 are used for different traffic types such as call signaling and video, and do not provide the strict priority required for voice.

Answer

CS3 (Class Selector 3)

Answer

AF41 (Assured Forwarding 41)

Answer

AF31 (Assured Forwarding 31)

Question 11

You are managing a Cisco Collaboration cluster and notice that database replication is stuck in a '3' (blocked) state. What is the standard troubleshooting step?

Accepted Answer

utils dbreplication reset. When database replication is stuck in a '3' (blocked) state in a Cisco Collaboration cluster, the standard troubleshooting step is to run 'utils dbreplication reset' on the publisher or affected subscriber. This command resets the replication and forces a full re-sync of the database, resolving blocked states caused by inconsistencies or network issues.

Answer

utils service restart Cisco Database Layer Monitor

Answer

utils system restart

Answer

utils network ping

Question 12

When designing a secure collaboration network, what is the best practice for handling certificates in a CUCM and Expressway cluster?

Accepted Answer

Use a trusted third-party CA for all servers.. The best practice is to use a trusted third-party Certificate Authority (CA) for all servers in a CUCM and Expressway cluster. Public CA-signed certificates are trusted by default on endpoints, browsers, and other servers, eliminating the need to distribute and manually trust self-signed or internal CA certificates. This is especially critical for Expressway-E, which faces external endpoints that will not trust an internal CA.

Answer

Use self-signed certificates on all nodes.

Answer

Disable certificate verification on all endpoints.

Answer

Use the Publisher as the CA for the entire network.

Question 13

In a Cisco CUCM cluster, which node is responsible for managing the database and performing configuration updates?

Accepted Answer

Publisher. The Publisher node in a CUCM cluster is the only node that owns the master database and is responsible for all configuration changes. Subscribers receive replicated copies of the database and are read-only for configuration purposes.

Answer

Subscriber

Answer

TFTP node

Answer

Music on Hold (MoH) node

Question 14

In a Webex hybrid environment, what is the primary role of the Expressway-C?

Accepted Answer

To provide a secure connector for Hybrid Services. Expressway-C is deployed inside the enterprise network and acts as the secure connector that initiates outbound-only connections to Expressway-E, which then relays traffic to Webex cloud services. This connector role is what enables Hybrid Services (Calendar, Message, Directory, Management, Call) to traverse the firewall without inbound pinholes. It does not manage DNS or replace CUCM; it is purely a traversal/connector component in the hybrid architecture.

Answer

To manage public DNS records

Answer

To act as a SIP proxy for internal phones

Answer

To replace the CUCM server

Question 15

Which Cisco feature is used to ensure voice traffic is prioritized over web traffic on a Cisco access switch?

Accepted Answer

Quality of Service (QoS). Quality of Service (QoS) is the Cisco feature set used to classify, mark, and prioritize voice traffic over less delay-sensitive traffic like web browsing on an access switch. QoS mechanisms such as classification, marking (DSCP EF for voice), queuing, and policing ensure voice packets are forwarded with low latency and jitter. This is the standard answer for prioritizing voice over data on a Cisco access switch.

Answer

SNMP Traps

Answer

Spanning Tree Protocol

Answer

VLAN Trunking

Question 16

Which TWO of the following are valid methods for providing high availability for IP phones in a CUCM design?

Accepted Answer

SRST deployment. Option C (SRST deployment) is correct because Survivable Remote Site Telephony lets remote-site IP phones register with a local router/gateway when WAN connectivity to the CUCM cluster is lost, keeping basic call processing available and thus providing high availability for those phones. Option E (CUCM Group configuration) is correct because a CUCM Group defines an ordered list of CUCM nodes that a device pool's phones use for registration; if the primary subscriber fails, phones fail over to the next CUCM node in the group, which is the standard CUCM redundancy mechanism. Option A is not a high-availability method for phone registration: multiple TFTP servers in Option 150 only provide redundancy for configuration file download, not for call processing/registration. Option B is invalid because DHCP cannot provide IP address redundancy for phones; DHCP only leases addresses and does not offer a failover address mechanism for the phone itself. Option D is not a CUCM phone high-availability method; CUCM uses a primary/secondary/tertiary node failover model via CUCM Groups and device pools, not round-robin load balancing of phone registrations.

Answer

Configuring multiple TFTP servers in Option 150

Answer

IP address redundancy via DHCP

Answer

Load balancing via round-robin

Question 17

You are configuring Webex Hybrid Message Service. What is the primary purpose of this service?

Accepted Answer

To enable messaging between on-premises IM&P users and Webex App users.. Webex Hybrid Message Service (Hybrid Message) connects an on-premises Cisco IM and Presence (IM&P) deployment with Webex App so users on both sides can exchange instant messages. It is a hybrid connector-based service that federates the on-prem XMPP infrastructure with the Webex cloud messaging fabric, allowing a phased migration where some users remain on-prem while others move to the cloud.

Answer

To provide external federation for IM users.

Answer

To archive all Webex messages to an on-premises server.

Answer

To synchronize user passwords with Active Directory.

Question 18

Which protocol is primarily used for the transmission of real-time voice and video data between two endpoints?

Accepted Answer

RTP. RTP (Real-time Transport Protocol) is the protocol that actually carries the digitized voice and video media streams between endpoints in real-time communications. It runs over UDP to minimize latency and jitter, and is paired with RTCP for quality feedback. SIP, SCCP, and TFTP are signaling or provisioning protocols, not media transport.

Answer

SCCP

Answer

TFTP

Answer

SIP

Question 19

Where in Webex Control Hub do you go to view the health status of all deployed Hybrid Services connectors?

Accepted Answer

Services > Hybrid. In Webex Control Hub, Hybrid Services connector health is monitored under Services > Hybrid. This section lists each connector (e.g., Calendar, Message, Directory, Call) and shows its status, version, and any alerts. Administrators use this page to verify connector registration, connectivity, and health.

Answer

Devices > Management

Answer

Analytics > Reports

Answer

Users > Settings

Question 20

Which service allows Webex users to see the presence status of an on-premises Jabber user?

Accepted Answer

Hybrid Presence Service.. Hybrid Presence Service (also known as Webex Hybrid Presence) allows Webex users to see the presence status of on-premises Jabber users by connecting the on-premises IM and Presence Service to Webex. The service synchronizes presence between the on-premises Cisco IM and Presence cluster and Webex, so a Webex user can see whether a Jabber user is available, busy, or away. This is the specific service designed for cross-presence visibility.

Answer

Hybrid Calendar Service.

Answer

Webex Calling.

Answer

Directory Connector.