Which subnet mask is valid?

What type of DNS resource record maps an IP address to a fully qualified domain name (FQDN)?

Which of the following determines the media access method that is used in a network?

Which of the following is a Layer 2 WAN protocol?

This question requires that you evaluate the underlined text to determine if it is correct.
A/anvirtual private network (VPN) protects a network's perimeter by monitoring traffic as it enters and leaves.
Select the correct answer if the underlined text does not make the statement correct.
Select 'No change is needed" if the underlined text makes the statement correct.