Network troubleshooting

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QUESTION 1: You are on your computer and you find out that you cannot connect to any website. What basic testing you will do first?
QUESTION 2: You are trying to connect to a website by typing its name but in vain. However, you can connect to it if you type its IP address. What can be the problem?
QUESTION 3: You are having a double NAT issue. Which is one of the troubleshooting measures you can adopt to correct this?
QUESTION 4: You are in a network with several computers and you realize there is an IP conflict issue. What you will do?
QUESTION 5: Is it recommended to install two antiviruses on a computer?
QUESTION 6: You cannot access a website. What can cause this?
QUESTION 7: You want to change the password of your WI-FI router, but you do not know your default gateway IP address. How to find it?
QUESTION 8: You are having issues to transfer/receive files from a server in your network. What can you do?
QUESTION 9: A customer phones you and tells you he/she cannot login on an online account. What is the possible cause of this issue?
QUESTION 10: You are not getting IP address on your computer. Which server you have to check?
QUESTION 11: After finding the problems on a network, what you should do next?
QUESTION 12: To enjoy a good wireless connection, it is better to not?
QUESTION 13: Which tool you can use to filter network traffics in a LAN?
QUESTION 14: You are using a hub in your LAN to connect 5 computers. However, you find out you are getting network issues. Which device you can use to replace the hub?
QUESTION 15: You are using "telnet" command to check a port. Your result is a blank screen on your command-prompt. What does this mean?
QUESTION 16: You are on a mobile device and you cannot connect to the web, what is the possible reason behind this?
QUESTION 17: You are troubleshooting a home network and you find out that the computer's IP address is: 190.168.5.100. What does this mean?
QUESTION 18: Which IP address class you will use in a home network?
QUESTION 19: A measure to secure your files is?
QUESTION 20: You are configuring an email server and you need to input the port number for SMTP. What is it?