Troubleshooting Cisco IP Telephony and Video (CTCOLLAB) Practice Exam
Prepare effectively for the Troubleshooting Cisco IP Telephony and Video (CTCOLLAB) certification with Exam Sage’s comprehensive practice exam. This expertly crafted exam simulation is designed to help networking professionals, system administrators, and Cisco collaboration engineers master the skills needed to identify, diagnose, and resolve issues within Cisco IP telephony and video networks.
What is the CTCOLLAB Exam?
The Troubleshooting Cisco IP Telephony and Video (CTCOLLAB) exam tests your ability to troubleshoot and maintain Cisco collaboration environments. It focuses on real-world scenarios involving Cisco Unified Communications Manager (CUCM), Cisco Unity Connection, Cisco Video endpoints, Cisco Unified Border Element (CUBE), and associated infrastructure components. Passing this exam validates your expertise in managing Cisco collaboration technologies, ensuring reliable voice and video communications.
What You Will Learn
How to effectively troubleshoot call signaling and media path issues in Cisco IP telephony environments
Diagnosing and resolving problems related to Cisco Unified Communications Manager and Cisco Unity Connection
Identifying configuration errors affecting voice and video endpoints
Managing and troubleshooting Cisco SRST, Device Mobility, and Cisco Video endpoints
Analyzing network issues such as DHCP, VLAN, QoS, and bandwidth constraints that impact voice and video quality
Using Cisco troubleshooting tools including RTMT, Cisco IOS debug commands, and packet capture techniques
Key Topics Covered
Cisco Unified Communications Manager troubleshooting
Cisco Unity Connection and voicemail troubleshooting
Call signaling and media path diagnostics (SIP, SCCP, RTP)
Cisco SRST and survivability issues
IP phone registration and firmware troubleshooting
QoS and network-related voice/video performance troubleshooting
Cisco Video endpoints and infrastructure issues
Cisco Border Element (CUBE) troubleshooting
Why Choose Exam Sage for Your CTCOLLAB Preparation?
ExamSage.com offers a trusted platform dedicated to delivering high-quality, accurate, and up-to-date practice exams for IT certifications. Our CTCOLLAB practice exam features realistic questions with detailed explanations designed to deepen your understanding and boost your confidence. Whether you are a beginner or experienced professional, Exam Sage’s practice exams simulate the real exam environment to help you identify knowledge gaps and improve your troubleshooting skills.
With Exam Sage, you get:
Comprehensive coverage aligned with the latest Cisco CTCOLLAB exam objectives
Clear, in-depth answer explanations to help you grasp complex concepts
Instant access to practice tests anytime, anywhere
A reliable and user-friendly platform tailored for exam success
Start your journey towards Cisco collaboration troubleshooting mastery with Exam Sage’s CTCOLLAB practice exam — your essential tool for exam success and career advancement.
Sample Questions and Answers
Question 1
A user complains that their IP phone displays “Registering” continuously. What is the most likely cause?
A. DHCP server is unreachable
B. TFTP server is down
C. Incorrect firmware on phone
D. IP phone is using an incorrect voice VLAN
Answer: B
Explanation:
If the TFTP server is down or unreachable, the IP phone will fail to download its configuration file and will remain in the “Registering” state. This is a common issue during phone boot-up.
Question 2
Which protocol is primarily used by Cisco phones to download configuration files from CUCM?
A. FTP
B. HTTP
C. TFTP
D. SCP
Answer: C
Explanation:
Cisco IP phones use Trivial File Transfer Protocol (TFTP) to download configuration and firmware files during the boot process.
Question 3
You’re troubleshooting a one-way audio issue. The calling party can hear the called party, but not vice versa. Which of the following is the likely issue?
A. Codec mismatch
B. NAT or firewall blocking RTP
C. CallManager down
D. Phone not registered
Answer: B
Explanation:
One-way audio usually results from RTP being blocked by a NAT device or firewall. Both directions must be open for two-way audio communication.
Question 4
A user reports dropped calls after exactly 15 minutes. What is the most probable cause?
A. SIP timer mismatch
B. SCCP version incompatibility
C. Codec complexity
D. TCP keepalive misconfiguration
Answer: A
Explanation:
SIP sessions can be terminated due to timer mismatches between endpoints, especially session refresh timers like Session-Expires.
Question 5
You see “503 Service Unavailable” in SIP traces from a CUCM cluster. What is the most likely cause?
A. DNS misconfiguration
B. Trunk not registered
C. Device pool mismatch
D. SIP trunk destination is down
Answer: D
Explanation:
“503 Service Unavailable” indicates that the destination SIP server or trunk is not responding or is rejecting requests, often due to downtime or overload.
Question 6
Which tool would you use on a Cisco router to debug voice quality issues?
A. debug ip packet
B. debug voip ccapi inout
C. debug sip messages
D. show run
Answer: B
Explanation:debug voip ccapi inout helps analyze call legs and signaling messages, making it valuable for voice call troubleshooting.
Question 7
An IP phone cannot reach the CUCM server. You verify network connectivity is working. What command helps verify the phone’s TFTP address?
A. show cdp neighbors
B. show dhcp lease
C. Settings > Network Configuration
D. show ip route
Answer: C
Explanation:
On the IP phone, navigate to Settings > Network Configuration to verify the TFTP server IP and other network settings.
Question 8
What does “Unallocated (unassigned) number” error in call failure logs suggest?
A. Codec not supported
B. Route pattern is missing in CUCM
C. Firewall blocks RTP
D. Phone not registered
Answer: B
Explanation:
This error indicates that the dialed number does not match any route pattern in CUCM, and thus cannot be routed.
Question 9
Which log file on CUCM helps analyze phone registration issues?
A. CallManager
B. SDLTrace
C. Tomcat
D. Event Viewer
Answer: A
Explanation:
The CallManager log file records detailed information about phone registrations, call processing, and SIP/SCCP signaling.
Question 10
A Jabber client fails to register. What should you check first?
A. NTP synchronization
B. IM&P server status
C. DNS SRV records
D. TFTP service
Answer: C
Explanation:
Jabber uses DNS SRV records to discover CUCM services. Misconfigured or missing records prevent registration.
Question 11
Which command shows registered endpoints in CUCM?
A. show endpoints
B. show ccm registration
C. show risdb status
D. utils dbreplication runtimestate
Answer: C
Explanation:show risdb status displays the status of registered devices including phones and gateways in CUCM.
Question 12
A video call between two Cisco endpoints shows no video. Which is the most likely cause?
A. Low bandwidth codec selected
B. MTP is disabled
C. Video capability is not enabled
D. SIP trunk is misconfigured
Answer: C
Explanation:
Video calls require endpoints and the call path to support and negotiate video. If video is disabled on either end, video won’t be displayed.
Question 13
Which service is responsible for directory integration in CUCM?
A. Cisco CTI Manager
B. Cisco Directory Sync
C. Cisco TFTP
D. Cisco Tomcat
Answer: D
Explanation:
Cisco Tomcat handles web services and directory lookups via LDAP for user authentication and synchronization.
Question 14
You notice poor voice quality with jitter and packet loss. What should you check?
A. Codec configuration
B. SIP trunk security profile
C. QoS configuration on WAN
D. IP helper address
Answer: C
Explanation:
QoS (Quality of Service) issues, such as missing DSCP markings or congestion on WAN links, often cause jitter and packet loss.
Question 15
Which command displays detailed SIP signaling on a Cisco voice gateway?
A. show sip status
B. debug ccsip messages
C. show run sip
D. debug voip packets
Answer: B
Explanation:debug ccsip messages captures SIP INVITE, ACK, BYE, and response codes, making it ideal for SIP signaling troubleshooting.
Question 16
What is the effect of an MTP being required on a SIP trunk?
A. Prevents all calls
B. Uses more bandwidth
C. Forces RTP anchoring
D. Enables SRTP automatically
Answer: C
Explanation:
Media Termination Point (MTP) required means that media must flow through CUCM, anchoring RTP, usually for signaling or codec mismatch handling.
Question 17
Which of the following tools is used for detailed packet capture on a Cisco switch?
A. SPAN
B. Wireshark
C. debug interface
D. NetFlow
Answer: A
Explanation:
SPAN (Switched Port Analyzer) mirrors traffic to a monitor port for packet capture and analysis.
Question 18
A voice gateway cannot register with CUCM. What might be missing?
A. Voice VLAN assignment
B. SIP Trunk Security Profile
C. Device pool configuration
D. MGCP bind command
Answer: D
Explanation:
For MGCP gateways, the mgcp bind control and mgcp bind media commands must be configured with the correct interface.
Question 19
Which of the following services must be running on CUCM for phones to register?
A. Cisco DirSync
B. Cisco TFTP
C. Cisco AXL Web Service
D. Cisco CTIManager
Answer: B
Explanation:
The Cisco TFTP service must be running to allow phones to download configuration files during registration.
Question 20
You observe a phone showing “CM list unreachable.” What does this indicate?
A. Phone is using static IP
B. DHCP server failed
C. All CUCM nodes in the list are unreachable
D. Phone firmware is outdated
Answer: C
Explanation:
“CM list unreachable” means that the phone cannot contact any CUCM in its list, possibly due to network issues or CUCM services being down.
Question 21
How can you reduce the number of media resources consumed in a multi-site deployment?
A. Force all calls through HQ
B. Enable RSVP agent
C. Use local MTPs
D. Deploy region-based codec selection
Answer: D
Explanation:
Region-based codec settings help optimize bandwidth usage and minimize unnecessary media resource allocation.
Question 22
Which tool helps visualize call flows and analyze CDR in Cisco environments?
A. RTMT
B. Wireshark
C. Cisco CDR Analysis and Reporting Tool
D. CUCM CLI
Answer: C
Explanation:
The CDR Analysis and Reporting Tool helps analyze call records, including failed and successful call flows.
Question 23
What is the purpose of SIP Options Ping?
A. Codec negotiation
B. Keepalive between SIP devices
C. Authenticate SIP endpoints
D. Encrypt signaling
Answer: B
Explanation:
SIP Options Ping helps monitor the availability of SIP trunks by sending periodic OPTIONS messages as keepalives.
Question 24
Which signal indicates CUCM is trying to ring a phone?
A. INVITE
B. ACK
C. 180 Ringing
D. BYE
Answer: C
Explanation:
A 180 Ringing message is sent by the called party’s endpoint to indicate the phone is ringing.
Question 25
A user reports choppy voice during calls. Which metric best indicates jitter?
A. MOS
B. Latency
C. RTP packet sequence
D. RTP jitter value
Answer: D
Explanation:
RTP jitter measures variation in packet arrival times and directly affects voice quality.
Question 26
Which component performs digit analysis and call routing in CUCM?
A. CTI Manager
B. Cisco TFTP
C. Call Control process
D. Media Resource Manager
Answer: C
Explanation:
The Call Control process in CUCM performs digit analysis, call routing, and call setup signaling.
Question 27
Where do you configure Cisco Unity Connection voicemail pilot number?
A. CUCM Route Pattern
B. CUCM Voice Mail Pilot
C. Unity Connection Dial Plan
D. Cisco TFTP
Answer: B
Explanation:
The voicemail pilot is configured in CUCM under Voice Mail Pilot, linking CUCM to Unity Connection.
Question 28
Which log shows details of media issues like DTMF or codec mismatch?
A. SDL Trace
B. Real-Time Monitoring Tool
C. Media Logs
D. Event Viewer
Answer: C
Explanation:
Media Logs contain detailed information about RTP streams, codec negotiation, and DTMF issues.
Question 29
A SIP call is rejected with a “488 Not Acceptable Here” response. What is the likely cause?
A. Codec not supported
B. Incorrect SIP domain
C. Firewall blocks SIP
D. Invalid SIP trunk
Answer: A
Explanation:
“488 Not Acceptable Here” usually indicates that the requested media capabilities (e.g., codec) are not supported by the receiving endpoint.
Question 30
Which command shows the active voice calls on a Cisco voice gateway?
A. show voice call summary
B. show call active
C. show voip stats
D. debug call
Answer: A
Explanation:show voice call summary provides a concise view of all active voice calls, including codec and call state.
