NAT

Question 1

Why is NAT required

Answer 1

Private address’ are not routable on the internet NAT enables private addressed hosts to route there traffic across the internet

Question 2

A NAT device can only modify the source address in an IP packet

True or False

Answer 2

False can modify both source and destination

Question 3

In NAT what does the inside or outside term refer to

Answer 3

The physical location of the host you are referring to:

Inside - inside the internal usually private network
Outside - outside the private network typically the internet

Question 4

In NAT what does the local or global term refer to

Answer 4

The perspective you are viewing the host form

Local - when you are viewing the host from inside the network
Global - when you are viewing the host from outside the network

Question 5

What are the 3 main types of NAT

Answer 5

Static
Pooled
PAT

Question 6

What is static NAT

Answer 6

a one to one mapping of the inside local address to the inside global address

Question 7

What is pooled NAT

Answer 7

a one to many mapping, there will be a pool of public address’ that can be used by the private address’ once the idle timer is reached (24 hours by default) the address is returned to the pool

Question 8

What is PAT

Answer 8

Port address translation uses the same public IP address however uses a port to distinguish the different hosts this one global ip address is beeing mapped to.

Question 9

What is NAT overload

Answer 9

PAT

Question 10

How do you view the NAT translation table

Answer 10

show ip nat translations