Week 4 - Network Address Translation

Question 1

What is NAT?

Answer 1

Network Address Translation

It takes an IP address and translates it into another (its own)

Question 2

What is IP masquerading?

Answer 2

IP Masquerading is when NAT rewrites data packets to include its own IP address as the source to hide the IP of the original client

Question 3

What is port preservation?

Answer 3

a technique where the router uses the same port selected by the client

the router only changes the source IP address but leaves the source port the same in the TCP datagram

Question 4

How do outbound connections choose a source port?

Answer 4

At random from the ephemeral ports (49,152-65,535)

Question 5

What is port forwarding?

Answer 5

Port forwarding basically means that all traffic can be directed to a single external IP and forwarded to a specific node using its specific port

Question 6

Where does your computer get its IP address from?What does it stand for?

Answer 6

Our computer gets its IP from the RIR

Region Internet Registries - IPs assigned to specific regions