CLCOR Infrastructure And Design Practice Test 3 — 15 Questions

Question 1

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. The 'utils dbreplication runtimestate' command is used to check the health, and 'utils dbreplication reset' is the standard procedure to fix synchronization issues.

Answer

utils service restart Cisco Database Layer Monitor

Answer

utils system restart

Answer

utils network ping

Question 2

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 3

Which protocol is primarily used by Cisco endpoints for music-on-hold (MoH) streaming from a Media Resource Group?

Accepted Answer

Multicast RTP. Multicast is the standard method for streaming MoH, as it saves significant bandwidth compared to unicast streams.

Answer

SIP INFO

Answer

HTTPS

Answer

Unicast RTSP

Question 4

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 5

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

Accepted Answer

SRST deployment. CUCM Groups (primary/secondary) and SRST (for WAN outage survivability) are the two primary methods for ensuring phone availability.

Answer

Configuring multiple TFTP servers in Option 150

Answer

IP address redundancy via DHCP

Answer

Load balancing via round-robin

Question 6

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 7

Which TWO of the following are common reasons for database replication failure in a CUCM cluster?

Accepted Answer

Blocked database replication ports. NTP synchronization issues and TCP port connectivity (like 1515, 1502) between nodes are the most frequent causes of database replication failure.

Answer

Incorrect IP address in host file

Answer

High CPU utilization on the publisher

Answer

Missing TFTP files

Question 8

Which THREE of the following are necessary to ensure successful NTP deployment in a CUCM cluster?

Accepted Answer

Configure external Stratum 1 or 2 servers. The publisher node must point to external Stratum 1 or 2 servers, subscribers must point to the publisher (or external sources), and firewall ports (UDP 123) must be open.

Answer

Use broadcast mode

Answer

Enable NTP on the local voice gateway

Question 9

Which THREE of the following are recommended steps when designing a secure signaling path between CUCM and a CUBE gateway?

Accepted Answer

Install and trust CA certificates. Using SIP Trunk Security Profiles, installing the correct CA certificates, and enabling TLS are the three pillars of securing the SIP signaling path.

Answer

Disable SIP digest authentication

Answer

Enable H.323 Fast Start

Question 10

You are designing a solution for a Cisco IP Phone that does not receive an IP address. Which DHCP feature must be enabled on the access switch to forward requests to the DHCP server?

Accepted Answer

IP Helper Address. DHCP Relay (or IP Helper Address) is required to forward broadcast DHCP requests across VLAN boundaries to a centralized DHCP server.

Answer

802.1X Authentication

Answer

Port Security

Answer

DHCP Snooping

Question 11

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). QoS (Quality of Service) is the umbrella term for prioritizing voice packets using DSCP tags.

Answer

SNMP Traps

Answer

Spanning Tree Protocol

Answer

VLAN Trunking

Question 12

What is the primary function of the CUBE in a SIP trunking scenario?

Accepted Answer

Demarcation and SIP normalization. The CUBE (Cisco Unified Border Element) acts as a demarcation point between the enterprise network and the service provider, handling SIP normalization, media relay, and security.

Answer

Call routing for internal phones

Answer

Voice messaging storage

Answer

DHCP Server functionality

Question 13

In the context of collaboration design, what is the purpose of the 'Location' in CUCM?

Accepted Answer

Call Admission Control. Locations are used for Call Admission Control (CAC) to limit the bandwidth consumed by calls traversing a specific path.

Answer

Defining physical building layouts

Answer

Device registration grouping

Answer

TFTP file distribution

Question 14

When designing for emergency services (E911) in a multisite deployment, what is the best practice for ensuring calls are routed to the correct Public Safety Answering Point (PSAP)?

Accepted Answer

Implement ELIN-based routing.. Using Location-based routing or ELIN (Emergency Location Identification Number) ensures the PSAP receives the specific physical address of the caller.

Answer

Route all calls to a central office.

Answer

Use the caller's IP address.

Answer

Disable emergency routing.

Question 15

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