Master ComptiaNetwork+ Network Trouble Shooting with our interactive study cards designed for effective learning. These flashcards use proven spaced repetition techniques to help you memorize key concepts, definitions, and facts. Perfect for students, professionals, and lifelong learners seeking to improve knowledge retention and ace exams through active recall practice.
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1. Identify the problem 2. Establish a theory 3. Test the theory 4. Establish a plan of action 5. Implement the solution 6. Verify functionality 7. Document findings
Identify the problem by gathering information and questioning users
Establish a plan of action to resolve the problem and identify potential effects
Re-establish a new theory or escalate the issue
To create a knowledge base and help resolve similar issues in the future
ipconfig or ipconfig /all for detailed information
ifconfig or ip addr show
Basic connectivity between two devices and measures round-trip time
Shows the path packets take to reach a destination and identifies where delays occur
Tests DNS name resolution and queries DNS servers
Active network connections listening ports and network statistics
Viewing and modifying the ARP cache which maps IP addresses to MAC addresses
Displays and modifies the routing table
Packet sniffer or protocol analyzer like Wireshark
Testing cable continuity and identifying wiring faults in network cables
Tracing cables through walls and identifying cable endpoints
Voltage current and resistance in electrical circuits
Testing network interface cards and port functionality
Device that locates breaks and faults in copper cables by measuring signal reflections
Optical Time Domain Reflectometer used to test fiber optic cables
Allows passive monitoring of network traffic without interrupting connections
Copying traffic from one port to another for monitoring and analysis
Loose cables EMI/RFI interference failing hardware or power issues
Electromagnetic Interference that disrupts signal transmission
Radio Frequency Interference from wireless devices or radio transmitters
Signal loss over distance requiring repeaters or shorter cable runs
Signal bleeding between adjacent wires causing interference
Excessive broadcast traffic flooding the network and degrading performance
Network congestion insufficient bandwidth routing issues or overloaded devices
Variation in packet arrival times affecting real-time applications
When packets fail to reach their destination due to congestion errors or routing issues
Cable problems port failures physical damage and environmental interference
Switching loops VLAN misconfigurations MAC address table problems and duplex mismatches
Routing problems incorrect IP configuration subnet mask errors and gateway issues
When two connected devices use different duplex settings causing collisions and poor performance
Able to ping IP addresses but cannot resolve hostnames
Devices receiving APIPA addresses (169.254.x.x) or no IP address
Automatic Private IP Addressing in the 169.254.0.0/16 range assigned when DHCP fails
ipconfig /release followed by ipconfig /renew
ipconfig /flushdns
Ping the local gateway to verify Layer 3 connectivity
Can reach local network but cannot reach remote networks
Bandwidth saturation network congestion or faulty network equipment
A switch port repeatedly going up and down indicating cable or hardware problems
Traffic taking different paths in different directions potentially causing firewall issues
When ICMP messages are blocked preventing path MTU discovery and causing connection failures
1500 bytes
Link lights not illuminated no connectivity at all or intermittent connections
Bandwidth monitor MRTG PRTG or network management system
Establishing normal network behavior to identify abnormal conditions during troubleshooting
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