Chapter 2-11 NAT

Question 1

What is a Inside Local address?

Answer 1

Usually an RFC 1918 IP (Private IP address)

Question 2

What is a Inside Global address?

Answer 2

Public IP inside host is given as it exits NAT

Question 3

What is a Outside Global address?

Answer 3

Reachable IP of a host on the Internet

Question 4

What is a Outside Local address?

Answer 4

The local IP assigned to an outside

Question 5

What is Static NAT?

Answer 5

Static NAT uses a one-to-one mapping of local and global IPs

Configured by the admin and remain constant always in NAT table

Question 6

What is Dynamic NAT

Answer 6

Dynamic NAT uses a pool of public addresses and assigns them on a FIFO (First In First Out) basis

Question 7

What are four [4] Reasons that NAT is positive?

Answer 7

1. Conservers IPv4 addresses
2. Increases the flexibility of connections to public networks
3. Provides consistency even if enterprise changes ISPs
4. Provides some security

Question 8

What are five [5] Reasons that NAT is Negative?

Answer 8

1. Performance – translation takes time
2. Prevents some apps (e.g. digital signatures)
3. End-to-end IP traceability is lost (i.e. auditing)
4. Complicates tunnelling protocols, such as IPsec
5. Some services can be disrupted

Question 9

What is IPv6 Unique Local Addresses prefix

Answer 9

FC00::/7 (FC00 to FDFF)