Cisco Unified Communications Solution Maintenance Flashcards
List the eight steps in the troubleshooting model.
- Define the problem.
- Gather the facts.
- Consider the most likely possible causes.
- Create an action plan.
- Implement the action plan.
- Determine whether the problem has been solved.
- If not resolved, create an action plan to resolve the next most probably cause.
- If resolved, complete the process.
What should one make sure to do in the “Define the problem” stage of troubleshooting?
Create a clear problem statement.
A troubleshooting action plan should make sure to do what?
Modify only one variable at a time.
What three things should one do to complete the troubleshooting process after a problem has been resolved?
- Document any changes.
- Document the root cause.
- Document the steps that solved the problem.
Name three items that should be considered during implementation of a troubleshooting action plan.
- Make sure that changes do not make a problem worse.
- Limit the impact of changes on other users.
- Minimize the extent of potential security lapses.
If a troubleshooting action plan does not solve the root cause of an issue, what should be done with the new configuration?
It should be kept in place if it results in a desirable configuration.
Name the five key areas of failure that can result in IP phone registration problems.
- Local to the phone
- VLAN or switch mismatches
- DHCP problems
- TFTP file download issues
- CUCM registration
What three items should one check to verify PoE to an IP phone?
- Physical connections
- PoE switch configuration
- IP phone configuration (expansion modules, standards supported)
What switch command displays whether the device has enough power available to power a new IP phone?
show power inline
What interface configuration command would one find if PoE has been disabled?
power inline never
What two locations should one check to verify a voice VLAN assignment?
On the switch, and on the IP phone.
Give the two commands you can use to verify the voice VLAN has been configured on a switch.
show run
show vlan
Give the command that verifies a switch interface’s operating mode (trunk vs access).
show interface switchport
Give the command that verifies a voice VLAN is allowed over a trunk.
show interface trunk
Name three items to check to confirm that an IP phone is on the proper voice VLAN.
- The VLAN configuration on the phone
- The IP address on the phone
- The phone log files, via a browser connection to the phone
Name three places to check to determine whether a DHCP issue exists.
- The DHCP helper-address on the router
- The DHCP server configuration
- The IP phone (confirm it’s on the right subnet)
Name three places to check when troubleshooting a potential TFTP server issue. State what should be checked at each location.
- The routing configuration, to confirm that TFTP requests can reach the TFTP server.
- The TFTP server, to confirm that configuration files exist for phones.
- The IP phone, to confirm the correct TFTP server is listed.
What command should be entered on a Cisco router serving as a TFTP server to generate the required phone configuration files?
(config-telephony-service)# create cnf-files
Give the command that displays all existing dial peers on a voice gateway.
show dial-peer voice summary
Give the command that displays digits as they are dialed.
debug voip dialer
Give the one-way delay, jitter, and packet loss thresholds for high-quality VoIP calls.
Delay: 150 ms
Jitter: 20 ms
Packet loss: 1%
Give the reference bandwidth used to compute utilization for G.711 and G.729A.
G.711: 80 kbps
G.729A: 24 kbps
Give the command that verifies QoS statistics.
show policy-map interface
