Public vs Private Addresses

Question 1

Public IP addresses

Answer 1

Leased to a corporation

Question 2

Private IP addresses

Answer 2

IP addresses that are unregistered and may overlap from one company to the next.

Question 3

Private IPv4 addresses for CISCO cert

Answer 3

Defined in RFC 1918

For internal use only

Question 4

Ranges Class A

Answer 4

10.0.0.0 through 10.255.255.255

Question 5

Ranges Class B

Answer 5

172.16.0.0 through 172.31.255.255

Question 6

Ranges Class C

Answer 6

192.168.0.0 through 192.168.255.255

Question 7

Network Address Translation

Answer 7

It enables private IP networks that use unregistered IP addresses to connect to the Internet. NAT operates on a router, usually connecting two networks together, and translates the private (not globally unique) addresses in the internal network into legal addresses, before packets are forwarded to another network.

Question 8

Public IPv4 addresses for CISCO cert

Answer 8

Globally unique
Should be purchased
Usually used in Internet edge
Taken from Class A, B, C, addressing space
Beyond the RFC 1918 space, all addresses are public