NAT

Question 1

What is NAT?

Answer 1

the process of rewriting the source and/or
destination IP addresses of packets as they
pass through a router or firewall

Question 2

What are the limitations of NAT?

Answer 2

– Services that require initiation of connections
from outside may not work
– Stateless protocols based on UDP may not work
– Network tunneling such as is used in VPNs may fail
because the NAT changes values in the headers
that IPSec uses to verify packet integrity

Question 3

What is static NAT?

Answer 3

This creates a permanent translation table
that allows external hosts to be mapped to
internal hosts

Question 4

What are the benefits of NAT?

Answer 4

-Lack of end-to-end connectivity may also be
considered a benefit because a NAT router
acts as a natural firewall
-Provides a solution to exhaustion of IPv4
addresses

Question 5

What is one to one NAT?

Answer 5

Each internal device is assigned its own external IP address

Question 6

What is destination NAT or PAT?

Answer 6

It involves mapping incoming connections to a specific internal IP address by port number
– E.g. Forward all traffic for port 80 to a specific internal web server

Question 7

What are some other uses of NAT?

Answer 7

• Load balancing
• Failover
• Transparent proxying
• Overlapping networks

Question 8

How does NAT allow the use of a single external IP address?

Answer 8

It changes the data packet header contents

Question 9

Whate are some private IP address ranges?

Answer 9

10. 0.0.0
11. 76.
12. 168.