Chapter 8: IP Subnetting, Troubleshooting & Intro to NAT

Question 1

How is NAT different from CIDR? pg. 264

Answer 1

NAT allows many private IP addresses to be represented by some smaller public IP addresses……….CIDR is used by ISPs to allocate a number of addresses to a company or home connection

Question 2

What are some characteristics of NAT? pg. 264

Answer 2

useful for network migrations and mergers, server load sharing, and creating ‘virtual servers’

Question 3

What is NAT helpful in decreasing? pg. 264

Answer 3

amount of required IP addresses

Question 4

What are some advantages to having NAT on your network? pg. 265

Answer 4

Conserves legally registered addresses, reduces address overlap occurrences, increases flexibility to connect to the internet, eliminates having to remember addresses when the network changes

Question 5

What are disadvantages to having NAT on your network? pg. 265

Answer 5

Translation introduces switching path delays, loss of end-to-end IP trace ability, certain apps won’t function with NAT enabled

Question 6

What type of NAT allows one-to-one mapping between local and global addresses? pg. 265

Answer 6

SNAT / Static NAT

Question 7

What’s so dynamic about DNAT? pg. 266

Answer 7

it enables you to map an unregistered IP address to a registered IP address from a pool of registered IP addresses

Question 8

What’s the most popular NAT? pg. 266

Answer 8

Overloading configuration of NAT aka PAT / Port Address Translation

Question 9

What are the public addresses on the network used after NAT translation? pg. 266

Answer 9

global addresses

Question 10

The inside local address is actually the __ __. while the outside local address is the address of the ___ __. pg. 266

Answer 10

private address, destination host

Question 11

The destination host is usually a public address and serves what purpose? pg 266

Answer 11

starts the packet on it’s journey

Question 12

So why has the world not run out of IP addresses at this point? pg. 267

Answer 12

because of NAT Overloading/ PAT

Question 13

How do port numbers help the router? pg. 267

Answer 13

by identifying which host should receive the return traffic

Question 14

How many hosts can you theoretically use with one real IP address at the Transport layer? pg. 268

Answer 14

65,000

Question 15

Translating the port number of a packet to a new destination by using a router or firewall is called __ __. pg. 268

Answer 15

port forwarding