27. NAT

Question 1

What is the translation of NAT?

Answer 1

Network Address Translation

Question 2

What are the 3 standards that work together in NAT?

Answer 2

• CIDR
• Private addressing
• NAT

Question 3

What does CIDR stand for?

Answer 3

• Global address assignment

- Defines public address assigning (IANA allocates)

Question 4

What does private addressing stand for?

Answer 4

Hosts that do not connect to the internet can use a private address:

Range 
Networks 
Class 
Number of networks 
10.0.0.0 - 10.255.255.255 
10.0.0.0 
A 
1 
172.16.0.0 - 172.31.255.255 
172.16.0.0 - 172.31.0.0 
B 
16 
192.168.0.0 - 192.168.255.255 
192.168.0.0 - 192.168.255.0 
C 
256

Question 5

What does NAT stand for?

Answer 5

• Allows hosts without a unique ID to communicate through the internet
• Changes the source IP

Question 6

What are 3 types of NAT?

Answer 6

• Static
• Dynamic
• PAT

Question 7

What are 3 types of addresses in NAT?

Answer 7

• Inside local (internal IP)
• Inside global (IP for external use)
• Outside global (hosts outside the enterprise

Question 8

Wat are the 4 steps of dynamic NAT?

Answer 8

1. Host sends a packet
2. NAT route checks the matchig logic if it needs NAT
3. Allocates an IP from the pool
4. Translaten the source IP and forwards the packet

Question 9

How to clear the NAT table?

Answer 9

clear ip nat translation