For a quick reference of the Five IPV$4$ Classes, visit hutps$//$Wuvimeridianoutpost$.$com$/$resources$/$articles$/$iP classes.pho

For each of the following addresses, identify the class of the address $($A$,$ B$,$ C$,$ D$,$ or E$).$ Then identify whether the address is a valld public iP address. If it is invalid, explain why.

a$)192\mathrm{.}168\mathrm{.}0\mathrm{.}1$

b$)227\mathrm{.}189\mathrm{.}64\mathrm{.}77$

c$)8888\mathrm{.}88\mathrm{.}88$

d$)177\mathrm{.}29\mathrm{.}187\mathrm{.}7$

e$)134\mathrm{.}72\mathrm{.}90\mathrm{.}1$

f$)200,257\mathrm{.}38\mathrm{.}40$

g$)172\mathrm{.}30\mathrm{.}99\mathrm{.}255$

h$)190\mathrm{.}104\mathrm{.}78\mathrm{.}2$

i$)10\mathrm{.}255\mathrm{.}00$

$15\mathrm{.}255\mathrm{.}255\mathrm{.}36$

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

True or fake: In order to communicate across the internet, two nodes need to know each other's MAC address.

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

How many bits in an IPVG address? How many different IPVG addresses are possible?

What is the purpose of port numbers? How mamy port numbers are there?

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

a$)$ IPaddress

b$)$ MAC address

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

Describe the role of the following types of DNS servers:

a$)$ Root server

b$)$ TLo senver

c$)$ Authoritative server

For the address

wnu$-$google.com, match the parts of the address to their roles:

unw top$-$level domain $($TLD$)$

google.com hostname

com domain name

What happens when you ping $127,0\mathrm{.}0\mathrm{.}1?$ Explain $($do not just provide a screenshot$).$

What command$-$line tool can you use to quickty determine your computer's IP address?

Try the following on the command line. What address do you get in each case? Why are they different?

a$)$ nstookup

google.com

b$)$ nslookup

google.com $8\mathrm{.}8\mathrm{.}8\mathrm{.}8$

c$)$ nslookup

google.com $1\mathrm{.}1\mathrm{.}1.$