CLCOR Practice Test 8 — 10 Questions

Question 1

You are deploying a Cisco Expressway-E in a DMZ. Which port must be opened on the external firewall to allow for H.460.18/19 firewall traversal for H.323 endpoints?

Accepted Answer

1720. Port 1720 is the standard H.323 signaling port used for traversal through the Expressway-E.

Answer

5061

Answer

8080

Answer

443

Question 2

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.. Using a trusted, third-party Certificate Authority (CA) ensures that all certificates are valid across both internal and external endpoints without security warnings.

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 3

Which THREE of the following are required DNS records for a successful Cisco MRA (Mobile and Remote Access) deployment?

Accepted Answer

_cisco-uds._tcp. MRA relies on SRV records for discovering the Expressway-E, the Collab-Edge TLS record for discovery, and the UDS service record for user settings.

Answer

_https._udp

Answer

_ftp._tcp

Question 4

You are designing a network for video collaboration. What is the recommended maximum one-way latency for high-quality video conferencing?

Accepted Answer

150ms. For high-quality, real-time video conferencing, one-way latency must be kept below 150ms to ensure a good user experience.

Answer

300ms

Answer

500ms

Answer

50ms

Question 5

Which TWO of the following are considered best practices for implementing QoS in a Cisco collaboration network?

Accepted Answer

Mark traffic as close to the source as possible. Cisco recommends using trust boundaries and marking traffic as close to the source as possible.

Answer

Trust all incoming traffic by default

Answer

Only mark traffic at the WAN edge

Answer

Disable all QoS policies to improve performance

Question 6

Which TWO of the following are essential components of a Cisco network readiness assessment for collaboration?

Accepted Answer

Bandwidth capacity analysis. Assessing existing bandwidth capacity and ensuring QoS settings are correctly applied are the two primary foundations for a network readiness assessment.

Answer

Analyzing NTP Stratum levels

Answer

Verifying phone firmware versions

Answer

Checking IP address assignment

Question 7

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.. By creating a specific CM Group with the New York subscribers in the preferred order and assigning it to the New York Device Pool.

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 8

Which THREE of the following items must be verified during a site-to-site VPN check for collaboration traffic?

Accepted Answer

MTU size. MTU sizes (to avoid fragmentation), DSCP tag preservation (to maintain QoS), and UDP port ranges (for RTP media) are critical for successful inter-site communication.

Answer

DHCP relay configuration

Answer

NTP server reachability

Question 9

Which service must be running for a Cisco IP Phone to download its configuration file via TFTP?

Accepted Answer

Cisco TFTP. The Cisco TFTP service is responsible for providing configuration files and firmware updates to registered devices.

Answer

Cisco CallManager

Answer

Cisco CTIManager

Answer

Cisco Database Layer Monitor

Question 10

Which component in the CUCM dial plan allows you to match a pattern and simultaneously transform it into a new number before the final route lookup?

Accepted Answer

Translation Pattern. A Translation Pattern is used to change digits (e.g., adding an access code) before the call is routed to a final destination.

Answer

Route Pattern

Answer

Partition

Answer

Route Group