100-890 Service Knowledge

Service Knowledge Detailed Explanation

This section focuses on understanding Cisco support services, managing device configurations, and troubleshooting tools. These skills help maintain collaboration devices and solve issues efficiently.

3.1 Cisco Support Services

Warranty Policies

1. Verifying Warranty Status

   • Every Cisco device comes with a limited warranty.
   • To check if a device is under warranty:
     • Go to Cisco’s official support website.
     • Use the Serial Number Lookup Tool to verify the device's warranty.
     • Ensure you have the device's serial number handy, often found on a label on the device.

2. RMA (Return Material Authorization) Process

   • RMA is Cisco’s process for repairing or replacing defective devices.
   • Steps in the RMA Process:
     • Open a support case through Cisco TAC.
     • Provide the device’s serial number and describe the issue.
     • If the device is eligible, Cisco will issue an RMA number and guide you on how to return the item.
   • Important Tips:
     • Backup configurations before sending the device for replacement.
     • Keep records of the RMA number for tracking.

Technical Support

1. Cisco TAC (Technical Assistance Center)

   • What It Does: Cisco TAC provides technical support for hardware, software, and network issues.
   • How to Submit a Case:
     • Log into Cisco’s TAC Support Portal.
     • Fill out a form detailing the issue (include device details, error codes, etc.).
     • You can also call Cisco TAC for urgent issues.
   • Levels of Support:
     • Cisco offers different levels of support contracts, such as SmartNet.

2. Using Online Support Resources

   • Cisco’s website provides:
     • Product manuals and configuration guides.
     • Troubleshooting documentation for common issues.
     • Forums where users share solutions.

3.2 Configuration and Backup

Configuration File Management

1. Backing Up Device XML Configuration Files

   • Why Backups Matter:
     • Prevent data loss if a device is reset or replaced.
   • Steps to Back Up:
     • Use CUCM’s administration portal to export configuration files.
     • Save the files securely on a local server or backup storage.

2. Importing and Exporting Configuration Files

   • Use tools like Cisco Configuration Professional or CUCM’s GUI.
   • Importing configuration files allows quick recovery of settings when replacing devices.

Device Logs and Status Checks

1. Viewing Device Logs

   • Logs provide detailed information about device events and errors.
   • CLI Command: Use the show logs command to view logs directly on the device.

2. CUCM RTMT (Real-Time Monitoring Tool)

   • Purpose: Monitor the health and performance of devices registered to CUCM.
   • Key Features:
     • Check device registration status.
     • View call statistics and resource utilization.
   • How to Use:
     • Install RTMT on your computer.
     • Connect it to your CUCM server to analyze devices in real time.

3.3 Troubleshooting Tools

Command-Line Tools

1. ping

   • Purpose: Verify if a device can communicate with other devices on the network.

   • How It Works:

     • Sends packets to a target IP address.
     • If replies are received, the connection is working.

   • Example:

     ping 192.168.1.1
     

2. traceroute

   • Purpose: Trace the path data takes through the network to reach a specific destination.

   • Use Case: Identify where network delays or blockages occur.

   • Example:

     traceroute 192.168.1.1
     

3. show Commands

   • Purpose: Display the status and configuration of the device.
   • Examples:
     • show running-config: Displays the current configuration.
     • show ip interface brief: Lists all interfaces and their IP addresses.

Log File Analysis

1. Capturing SIP/RTP Packets with Wireshark

   • What It Does: Wireshark captures network traffic for detailed analysis.
   • Use Case: Diagnose issues like SIP registration failures or RTP packet loss.
   • Steps:
     • Install Wireshark on your computer.
     • Set the network interface to capture traffic.
     • Apply filters (e.g., sip or rtp) to focus on relevant packets.

2. Reading Device Log Files

   • Logs often include error codes or warnings.
   • Match these codes with Cisco documentation to identify solutions.

Web GUI

1. Accessing the Web Interface

   • Most Cisco devices have a built-in web interface.
   • Steps:
     • Open a browser and enter the device’s IP address.
     • Log in using admin credentials.
   • Common Tasks:
     • View status, configure settings, and update firmware.

2. Diagnosing Issues

   • Use the GUI to check:
     • Device registration status.
     • Network settings like IP addresses and VLAN configurations.
     • Firmware versions and logs.

Summary for Beginners

• Cisco Support Services:
  • Understand warranties and how to use Cisco TAC for help.
  • Familiarize yourself with online resources for troubleshooting.
• Configuration and Backup:
  • Learn to back up and restore configuration files to avoid data loss.
  • Use RTMT to monitor device health in real time.
• Troubleshooting Tools:
  • Master basic tools like ping and traceroute for network diagnosis.
  • Use Wireshark for advanced packet analysis.
  • Leverage the web interface for quick device diagnostics.

These skills will help you effectively manage and troubleshoot Cisco collaboration devices.

Service Knowledge (Additional Content)

1. Cisco TAC Support Level Comparison

In real deployments and exam scenarios, understanding the types of Cisco support contracts is essential, especially when determining what services are available to a customer or device.

Common Cisco Support Options

Support Type	Description
SmartNet	Cisco’s most common support contract. Includes 24x7 TAC access, hardware replacement (RMA), and software updates.
Partner Support Service	Support is delivered by Cisco-authorized partners. Cisco provides backend escalation support.
Cisco Solution Support	Designed for multi-vendor solutions. Cisco takes ownership of issue resolution across integrated systems.

Why It Matters

• Questions may test your ability to identify which support level applies to a specific use case.

• For example: "Which Cisco support offering ensures a single point of contact for multi-vendor troubleshooting?"

2. RTMT (Real-Time Monitoring Tool) — Detailed Monitoring Capabilities

RTMT is not just a passive dashboard—it is a real-time diagnostic and alerting tool tied directly to CUCM and related services.

Key RTMT Monitoring Features

Function	Description
Phone Unregistered Alerts	Identifies phones that have unexpectedly unregistered from CUCM
CallManager CPU/Memory Usage	Monitors system performance metrics for CUCM nodes
SIP Trunk Status	Tracks the operational state of SIP trunks (up/down, call volume, error rates)
Voice Gateway Interface Errors	Detects interface drops, packet loss, or other voice gateway problems

How It’s Used

• Technicians can set alarms to notify them when values exceed thresholds.

• Useful for proactive troubleshooting before users report issues.

• May be tested in questions like: “Which RTMT feature helps detect mass phone deregistration?”

3. Wireshark Filtering Examples for Collaboration Traffic

Wireshark is a powerful tool, but without proper filtering, analysis becomes time-consuming. Simple, effective filters help focus on relevant traffic such as SIP signaling or RTP media streams.

Common Wireshark Filters

Filter Syntax	Purpose
`sip
ip.addr == 192.168.1.50	Show all traffic to and from a specific device IP
tcp.port == 5060	Show SIP traffic over TCP (if used)
udp.port >= 16384 && udp.port <= 32767	Filter for RTP media streams (commonly dynamic ports)

Why It Matters

• Enables quick identification of call setup failures, packet loss, or one-way audio issues.

• Exam scenarios may reference filtered outputs or ask what filters to use to capture RTP.

4. Cisco TAC Case Submission Workflow (Summary)

Understanding how to interact with Cisco TAC is both a practical skill and a testable concept in the CCT exam. The TAC case workflow typically follows a structured process.

TAC Case Submission Steps

1. Login to Cisco Support Portal:

• Visit https://mycase.cloudapps.cisco.com

2. Navigate to the "Open New Case" section.

3. Fill out required information:

• Device serial number

• Detailed problem description (logs, error messages, impact)

4. Select priority level based on impact and urgency.

5. Submit the case and track progress using the Case Number assigned.

Why This Matters

• You may be asked to identify missing steps in a TAC submission workflow.

• Knowing this process helps demonstrate operational readiness, not just technical knowledge.

Summary of Enhancements

Section	Enhancement	Benefit for Learning and Exams
TAC Support Levels	Clear comparison between Cisco service tiers	Helps identify service entitlements in real-world and scenario-based questions
RTMT Details	Key monitoring functions listed	Reinforces RTMT’s role in proactive alerting and performance management
Wireshark Filters	Practical filter examples	Makes traffic analysis more approachable and test-relevant
TAC Workflow	Simplified 5-step summary	Clarifies Cisco’s formal process for support interactions