Which of the following services masks internal IP addresses from outside the network?

The host name of the fully qualified domain name (FQDN) mail.exchange.corp.nwtraders.com is:

You ping a server by using fully qualified domain name (FQDN) and do not receive a response. You then ping the same server by using its IP address and receive a response.
Why do you receive a response on the second attempt but not on the first attempt?

This question requires that you evaluate the underlined text to determine if it is correct.
All session data is encrypted between all machines while using telnet.
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.

If a router cannot determine the next hop for a packet, the router will: