$2.$ How many bits in a MAC address? What are the two parts of a MAC address?

$3.$ True or false: In order to communicate across the internet, two nodes need to know each other$$s MAC

address.

$4.$ How many bits in an IPv$4$ address? How many different IPv$4$ addresses are possible?

$5.$ How many bits in an IPv$6$ address? How many different IPv$6$ addresses are possible?

$6.$ What is the purpose of port numbers? How many port numbers are there?

$7.$ To what layer of the OSI model does each of the following address types belong? Justify your answer.

a$)$ IP address

b$)$ MAC address

c$)$ Fully qualified domain name $($FQDN$)$

$8.$ Describe the role of the following types of DNS servers: