FUNDAMENTALS OF COMPUTER

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COMPUTER THREATS SECURITY

TYPES OF NETWORK SECURITY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A technician is attempting to resolve an issue with users on the network not being able to access websites. The technician pings the default gateway and DNS servers successfully. Pinging a website by URL is unsuccessful but using a known IP address is successful. Which of the following will resolve the issue?
A
Update the HOST file with the URLs for all websites
B
Use NSLOOKUP to resolve URLs
C
Ensure ICMP messages can pass through the firewall
D
Enable port 53 on the firewall
Explanation: 

Detailed explanation-1: -This issue is typically caused by a problem with domain name server (DNS) resolution because the Internet service provider’s DNS servers are unavailable or a problem with the security software (usually a firewall) running on the computer which is attempting to access the Internet.

Detailed explanation-2: -DHCP Reservations – This is where you can assign a unique, fixed IP Address to a specific device on your network. This is helpful when you want your device to have the same IP Address every time it connects to the network.

Detailed explanation-3: -The third step is to test the theory of probable cause. If the theory is confirmed, the technician should move on to the next step. If the theory is proven to be incorrect, then it will be necessary to reestablish a new theory of probable cause.

Detailed explanation-4: -Which best describes IP’s use of the time-to-live (TTL) field? The TTL specifies the time a datagram is allowed to remain on the network.

There is 1 question to complete.
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