5.0 Network troubleshooting Flashcards
troubleshooting methodology, cabling and interface issues, network services issues, performance issues, troubleshooting tools. (23 cards)
Which phase of the troubleshooting process is likely to consume the majority of a technician’s time?
Problem diagnosis.
what are the 7 steps of the troubleshooting model?
- Identify problem
- Establish theory of probable cause
- Test theory
- Create POA
- Implement and test POA
- Verify system functionality
- Document findings
What does the ping command do?
Check connectivity between devices.
Traceroute
Identify the path packets take to a destination
IPConfig/IFConfig
Display and manage IP configurations
Netstat
Show active connections and listening ports
Nslookup/dig command
Query DNS records and troubleshoot DNS issues
ARP command
Display ARP cache and resolve MAC/IP issues.
Nmap command
Scan open ports and detect network devices.
Wireshark
Analyze network traffic for packet-level troubleshooting.
Pathping
Combines ping and tracert for detailed latency reports
OTDR
optical time-domain reflectometer: used on fibre-optic cables rather than copper cables to tell location of a break.
TDR
Time-Domain Reflectometer - works with copper cables to tell you the location of a break.
Toner Probes
Trace cables through walls or ceilings
Cable Testers
Verify cable integrity and identify wiring issues
Loopback Plugs
Test network interfaces for proper operation.
What does the -o flag in netstat show?
Shows the process ID of the process that owns a particular network connection.
-p flag in netstat
Specifies a particular protocol to show
-n flag in netstat
Uses numerical formats for addresses and port numbers
-a flag in netstat
Shows all active sessions including TCP and UDP port numbers
cable tester
tests the category of Unshielded Twisted Pair (UTP) cable.
ipconfig /all
displays information and servers, information on all the adapters and interfaces in the computer
mtr
Linux equivalent to ping path.
