NETWORK CONNECTIVITY CHECKING
PROCEDURE AND TECHNIQUES
Presented by Group 1
Parac, Steve
Formilles, Jemrell
Diza, Jhon Peter
Limpasa, Mark Dave
Troubleshooting
Process
1. Identify the Problem Gather information - Assess the current network status
using troubleshooting tools.
The first step in troubleshooting a Duplicate the problem - Replicate the issue on a test
system to confirm its origin.
network is to identify the problem.
Question users - Interview users to gather information
As a part of this step, you should do on encountered errors or difficulties.
the following: Identify the symptoms - Identify specific symptoms of
the network problem (e.g., complete loss, slow behavior).
Determine if anything has changed - Determine if the
issue is widespread or isolated to specific users.
Investigate recent changes in the network, such as new
hardware, users, or software updates.
Define individual problems clearly - Clearly define
individual problems to avoid complications in solving
each issue independently.
Troubleshooting
Process
2. Develop a Theory 3. Test the Theory
After collecting all available Utilize available tools to test your
information about the network theory. For example, if you suspect
problem, formulate a working a defective network router, replace
theory. Challenge apparent causes it with another to check for issue
and be vigilant for potentially more resolution. Remember that
severe issues. Network outages can disproving a theory doesn't signify
result from simple problems like failure; it prompts a return to step
tripped wires or more complex two to develop and test a new
issues such as security breaches. theory. It's common to explore
multiple theories before identifying
the actual cause of network issues.
Troubleshooting
Process
4. Plan of Action 5. Implement the Solution
Upon validating your theory on the Now that you have a plan for fixing
network issues, develop a solution the network, it’s time to implement
plan. This may involve a single it. There are some solutions that
action, like restarting the router, or you may be able to do by yourself,
a more intricate process, such as while others may require
ordering a new part or reverting cooperation from other network
software versions on multiple users' administrators or users.
computers.
Troubleshooting
Process
6. Verify System Functionality 7. Document the Issue
After implementing your solution, For frequent network professionals,
thoroughly test the network to this likely won't be the last
ensure the targeted issue is encounter with such issues.
resolved. Remain vigilant for any Document each troubleshooting
potential new problems arising stage, noting network symptoms,
from the implemented changes. theory, testing strategy, and the
During the verification process, implemented solution. Even if not
consult both network tools and personally used, this
individual user feedback to assess documentation may aid future
the overall functionality of the network engineers, potentially
network. reducing downtime.
TROUBLESHOOTING
TECHNIQUES
1.Verify Physical Connectivity
Checking physical connectivity helps eliminate potential physical
problems causing network issues. If physical connectivity isn't the
problem, proceed to other troubleshooting steps.
here are some specific things you can do to verify physical connectivity:
• Check the cables
• Check the power
• Check the network interface
• Check the lights
• Check the physical damage
TROUBLESHOOTING
TECHNIQUES
2. Check Network Configuration 3. Ping the Devices
Confirming the accuracy of the network Sending a ping to the device is a
configuration, including ensuring fundamental troubleshooting method
correct IP addresses and subnet masks to check its accessibility and
for all devices, is crucial. This step helps responsiveness to network requests. If
identify and correct misconfigurations there's no response, this could indicate
or errors that could be causing network a connectivity issue.
connectivity issues.
• Check IP addresses Here are the steps to ping a device:
• Check DNS settings • Open command prompt
• Check routing tables • Enter ping command
• Check the firewall settings • Interpret results
• Check network services
TROUBLESHOOTING
TECHNIQUES
4. Check Network Adapter Settings 5. Check Network Services
Next, Ensure that the network adapter Confirm the operation of essential
settings are correct and that the correct network services like DHCP and DNS to
driver is installed. By checking the network guarantee proper configuration and
adapter settings, you can ensure that your functionality. Identifying and addressing
network adapter is properly configured any issues with these services can be
and connected to the network. If there are instrumental in resolving network
any issues with the adapter settings, you connectivity problems.
can then troubleshoot and fix them
accordingly.
• Open Network and Sharing Center • Check if required network services are running
• Check the adapter status • Restart network services
• Check the IP configuration • Check for conflicts between network services
• Check for duplicate IP addresses • Check for software or firmware updates
• Check for proxy settings
TROUBLESHOOTING
TECHNIQUES
6. Check Firewall And security Settings 7. Check for Firmware Updates
Confirm that the firewall is allowing traffic and Ensure that the device's firmware is current and
that security configurations are set up properly. that any known issues have been addressed.
Reviewing firewall and security settings will help Updating firmware can be instrumental in
identify and address any potential network resolving network connectivity issues,
connectivity issues. If there are concerns with particularly when the problem is associated with
the firewall or security configurations, a specific network device.
troubleshooting and adjustments can be made Here are some steps to check for firmware
to resolve connectivity issues effectively. updates:
• Check firewall rules • Identify the device
• Disable firewalls • Check the manufacturer's website
• Check security settings • Download and install the firmware update
• Update firewall and security software • Restart the device
TROUBLESHOOTING
TECHNIQUES
8. Network Diagnostic Tools 9. Configure Router Settings
Employing network diagnostic tools is beneficial Your router manages all network traffic, and if
when troubleshooting network connectivity you're experiencing connectivity issues, router
problems. There is a range of available tools, and settings may be to blame. We'll explore common
the choice of a specific tool depends on the configurations that might need adjustment, but be
nature of the issue you are encountering. cautious as tweaking router settings can be
complex and requires technical expertise.
Some common network diagnostic tools include:
• Network analyzer
• Netstat
• Obkio
TROUBLESHOOTING
TECHNIQUES
Here are some ways you can configure your router settings to troubleshoot network
connectivity issues:
• Update firmware
• Reset router
• Enable Quality of Service (QoS)
• Restart the device
• Check wireless settings
• Change channel
• Enable guest network
UTILITIES USED TO VERIFY TCP/IP
CONNECTIVITY
Use CLI (Command Line Interface)
IP config
- checks to make sure correct IP and subnet mask
Ping
- verifies connectivity to other hosts
Tracert
- traces the route of the packet
Netstat
- show what networks are active
Nslookup
- asks the name server for information
NETWORKING COMMAND LINE TOOLS
IP CONFIG commands
IPconfig
Ipconfig / all
Ipconfig / release
Ipconfig / renew
NETWORKING COMMAND LINE TOOLS
Ipconfig
- displays current TCP/IP
network configuration value
- IP adress
- Subnet Mask
- Default Gateway
NETWORKING COMMAND LINE TOOLS
Ipconfig / all
-displays additional
information
-DCHP
-DNS information
NETWORKING COMMAND LINE TOOLS
Ip config / renew
- used with DCHP
-refresh IP
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