Address Translation (obj 2.1)

Question 1

What prompted the development of address translation?

Answer 1

IPv4 faced address exhaustion

Address translation was necessary to manage the limited number of IPv4 addresses.

Question 2

What is the purpose of Address Translation?

Answer 2

Allows private IP addresses to be translated into public IP addresses for routing over public networks like the internet

This enables devices with private IPs to communicate over the internet.

Question 3

What does Network Address Translation (NAT) do?

Answer 3

Conserves limited IPv4 addresses by translating private IPs into public IPs

NAT helps manage the shortage of available IPv4 addresses.

Question 4

What is Dynamic NAT (DNAT)?

Answer 4

Automatically assigns IP addresses from a pool of IPs for one-to-one translation

DNAT is useful for dynamic allocation of IP addresses.

Question 5

What is Static NAT (SNAT)?

Answer 5

Manually assigns private IPs to public IPs for one-to-one translation

SNAT is often used as a security feature.

Question 6

What is Port Address Translation (PAT)?

Answer 6

Allows multiple devices to share a single public IP address by using different port numbers to differentiate traffic

PAT is also known as many-to-one translation.

Question 7

What does the term ‘Inside Local’ refer to in NAT IP Address Terminology?

Answer 7

Private IP address referencing an inside device

This is the IP address used within a local network.

Question 8

What does the term ‘Inside Global’ refer to in NAT IP Address Terminology?

Answer 8

Public IP address referencing an inside device

This is the IP address that is visible on the internet.

Question 9

What does the term ‘Outside Local’ refer to in NAT IP Address Terminology?

Answer 9

Private IP address referencing an outside device

This can be used for communicating with devices outside the local network.

Question 10

What does the term ‘Outside Global’ refer to in NAT IP Address Terminology?

Answer 10

Public IP address referencing an outside device

This is the IP address that represents an external device on the internet.

Question 11

How does NAT differ from PAT?

Answer 11

NAT translates private IPs to public IPs for individual devices; PAT uses port numbers to differentiate between multiple devices sharing a single public IP

This distinction is crucial for understanding how IP address management works in networking.