In this section of the course,
we're going to discuss troubleshooting network services.
Now, network services are essential components
that manage various operations within a computer network,
and they work to facilitate the data exchange
and communication across your network.
Services like DHCP will handle the automatic assignment
of IP addresses, or routing and switching,
will direct traffic efficiently across your network.
Now, additionally, security measures like firewalls
will be used to protect our network
and systems like DNS and NTP
will ensure proper domain name resolution
and time synchronization are happening
on your network clients.
But if any of these services begin to have issues,
it'll start to create a myriad of other problems
for your network clients and even your networks at large.
So in this section of the course,
we'll be focused solely
on "Domain 5: Network Troubleshooting",
and this time we'll be looking at Objective 5.3.
Objective 5.3 states that,
"Given a scenario, you must be able to troubleshoot
common issues with network services."
First, we'll look at issues surrounding duplicate addresses.
Duplicate address issues will occur
when two devices on the same network
are assigned or claim the same IP address
and this leads to conflicts and connectivity problems.
Then we're going to discuss DHCP issues.
DHCP issues can stem from misconfigurations
or exhausted address pools
that can prevent devices from obtaining the necessary IP
information that they need in order to join your network.
Next, we'll learn about routing issues.
Routing issues often are manifested as misdirected
or lost out of packets that end up causing delays
or failures in the data reaching its intended destination.
After that, we're going to explore switching and routing loops.
Switching and routing loops can create broadcast storms
that overwhelm our network resources,
and this leads to significant slowdowns
or complete network outages for us.
Then we're going to cover firewall issues.
Firewall issues may arise from overly strict rules
or misconfigurations that block legitimate traffic
or allow unauthorized access.
Next, we'll look at IP configuration issues.
IP configuration issues include incorrect subnet mass,
gateways or DNS server addresses
that impede proper network communication.
After that, we'll be exploring VLAN issues.
VLAN issues typically involve incorrect port assignments
or tagging, and this can lead to a segmentation of devices
and this hinders your inner VLAN communications.
Then we'll be discussing DNS and NTP issues.
DNS issues can prevent users from accessing websites
because they can't resolve domain names.
And NTP issues can lead
to time synchronization problems across all
of your network clients and devices.
Finally, we'll take a short quiz to see what you learned
during this section of the course
and review your answers to ensure you know why the right
answers were right and the wrong answers were wrong.
So if you're ready, let's get started troubleshooting
network services in this section of the course.