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Scenario:
A User calls you on the phone and tells you that she cannot get to the internet.
As you know part of a sys. admin job is helping out your users when they can’t get to the internet. For many employees, a lot of their work is done from the internet, so chances are she needs her connection up and running as soon as possible.
The question that should come to your mind, is. Does this mean that there is a problem with our network or is this a problem with the user’s machine?
- You go to the user’s computer, open a command prompt and try to recreate the problem by typing ping google.com. You cannot ping google.com. So, does that mean the whole internet or network is down? Or is there something wrong at the local ISP?
You ask the other users and they can all get to the internet.
So, the problem is probably not the network or the internet.
- If you have been listening to the lectures by now you know that DNS allows you to get to a target destination by using a name. Because that is what Domain Name Service does it translates that name to an IP address.
- So now if I type ping 8.8.8.8, which is googles public DNS server.
- But before I press return, let’s think about this, if I cannot ping google.com by name but I can ping google.com by IP address, what would the problem be? I think we could say that it starting to look more like a DNS name resolution issue. So, now we have effectively narrowed down our list of potential causes of this problem to a possible name resolution issue.
- And I see that I can ping 8.8.8.8
- So, I am failing to reach google by its name but successfully reaching google by its IP address. Again, more evidence of a name resolution issue.
- How can we check this? From the command prompt type ipconfig /all
- The question is what is this machine using for DNS name resolution?
We can see that the DNS server is set to loopback, which is 127.0.0.1.
This effectively means that name resolution has failed because the computer is looping back to itself, and cannot get to the proper DNS server to resolve the name google.com.
- How can we fix this?
Right click on our network icon, click Open Network and Sharing Center, click Ethernet, click properties, then click Internet Protocol Version 4 (TCPIP/IPv4), then click properties.
Here is the problem, the loopback address is configured for our Preferred DNS server.
Click in the box and type the correct IP address of our Domain Controller/DNS server
ITFDC01, which is 192.168.0.10
- Now let’s open a command prompt and type ping 8.8.8.8. We see that works now type google.com and we are getting name resolution. Now bring up Internet explorer and we see that is working as well.
- Trouble shooting is a skill that you will develop with time. Always when you first start with any trouble shooting issue it may seem difficult at first to solve the problem. A good troubleshooter is someone that is skilled at narrowing down the possibilities until you find one solution that fixes the problem.
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CURRICULUM
Course Introduction • 10min
0 / 2 lessons complete
Instructor and Course Introduction
Video | 7 min
What's New in Windows Server 2016 DNS
Free lesson
Video | 3 min
DNS Basics • 56min
0 / 8 lessons complete
What is DNS
Video | 3 min
Installing the DNS Windows Server Role
Video | 6 min
Building DNS Server Quiz
Quiz | 10 Questions
The Hosts File
Video | 4 min
DNS Console Overview
Video | 7 min
Recursive and Iterative Queries
Video | 8 min
DNS Basics LAB
Video | 10 min
DNS Basics Quiz
Quiz | 8 Questions
DNS Resource Records • 45min
0 / 5 lessons complete
DNS Resource Record Types
Video | 3 min
Creating the mytestzone Forward Lookup Zone
Text | 2 min
Creating DNS Resource Records
Video | 4 min
Creating DNS Resource Records Lab
Lab | 30 min
DNS Resource Records Quiz
Quiz | 7 Questions
DNS Zones • 4hr 11min
0 / 12 lessons complete
DNS Zones
Video | 4 min
Creating a Forward and Reverse Lookup Zone
Video | 5 min
Creating a Secondary Zones
Video | 9 min
Stub Zone Creation
Video | 11 min
Active Directory Zone Replication
Video | 12 min
Implementing DNS Forwarding
Video | 8 min
Implementing Conditional DNS Forwarding
Video | 7 min
Forward and Reverse Zone Creation Lab
Lab | 60 min
Creating a Secondary Zone Lab
Lab | 30 min
Conditional Forwarding Lab
Lab | 60 min
Creating a Stub Zone Lab
Lab | 30 min
DNS Zones Quiz
Quiz | 15 Questions
DNS Delegation • 50min
0 / 4 lessons complete
Domain Name System and DNS Delegation
Video | 7 min
Windows 2016 Server and DNS Zone Delegation
Video | 8 min
DNS Delegation Lab
Lab | 30 min
QUIZ - Domain Name System and DNS Delegation
Quiz | 5 Questions
DNS Security Techniques • 36min
0 / 5 lessons complete
DNS Security Techniques Overview
Video | 9 min
Configuring DNS Cache Locking
Video | 5 min
Configuring DNS Socket Pools
Video | 6 min
Configuring Response Rate Limiting
Video | 8 min
DNS Security Techniques Quiz
Quiz | 8 Questions
Advanced DNS Topics • 22min
0 / 5 lessons complete
Overview of Advanced Topics
Video | 1 min
Enabling Round Robin and Netmask Ordering
Video | 5 min
Configuring Recursion
Video | 4 min
IPV4 and IPV6 Root HInts
Video | 6 min
Advanced DNS Topics Quiz
Quiz | 6 Questions
DNS Security (DNSSEC) • 1hr 16min
0 / 6 lessons complete
Windows DNS Security Overview
Video | 7 min
Symmetric vs Asymmetric Encryption
Video | 5 min
Installing DNSSEC on Windows 2016 Server
Video | 12 min
DNSSEC Client Install
Video | 7 min
DNSSEC (DNS Security Lab)
Lab | 30 min
DNSSEC Quiz
Quiz | 15 Questions
DNS Policies • 55min
0 / 6 lessons complete
DNS Policies Background Information
Video | 8 min
Configuring DNS Filtering
Video | 7 min
Configuring Split Brain DNS in an Active Directory Environment
Video | 12 min
Configuring DNS Selective Recursion Policy
Video | 7 min
Configuring a Traffic Management Policy
Video | 11 min
DNS Policies Quiz
Quiz | 10 Questions
PowerShell for DNS • 1hr 27min
0 / 6 lessons complete
PowerShell for DNS Part 1
Video | 2 min
PowerShell for DNS Part 2
Video | 5 min
PowerShell for DNS Part 3
Video | 10 min
PowerShell for DNS Part 4
Video | 5 min
PowerShell for DNS LAB
Lab | 60 min
Powershell for DNS Quiz
Quiz | 5 Questions
Troubleshooting DNS Issues - Troubleshooting Tools • 1hr 39min
0 / 8 lessons complete
Troubleshooting Tools Every IT Pro Must Know
Video | 9 min
The Events Viewer Overview
Video | 6 min
Subscriptions
Video | 9 min
Monitoring and Debug Logging
Video | 9 min
Trouble-Shooting DNS Client Issues
Video | 4 min
Troubleshooting Subscriptions Lab
Lab | 30 min
DNS Troubleshooting Lab
Lab | 30 min
DNS Troubleshooting Quiz
Quiz | 2 Questions