Ch. 4.3

Question 1

What is classless addressing?

Answer 1

IP Network and Subnet ID defined by Network Masks

Question 2

What is classful addressing?

Answer 2

Allocates Network ID based on first octet of the IP Address

Question 3

What are the Class A first octets?

How many max network addresses can there be?

Answer 3

1-126

126

Question 4

What are the Public Class B first octets?

Answer 4

128-191

Question 5

What are the Class C first octets?

How many max hosts can there be per address?

Answer 5

192-223

254 hosts per address

Question 6

What is IP range 0.0.0.0/8 for?

Answer 6

0.0.0.8 means “This Network”

Question 7

What is IP range 127.0.0.0/8 for?

Answer 7

127.0.0.0/8 is used for loopback addressing

Question 8

What can a public IP address do?

Answer 8

Establish a connection with other Public networks and hosts over the Internet

Question 9

Who governs the public IP addresses?

Answer 9

IANA

Internet Assigned Numbers Authority

Question 10

What is the range of Class A private address range?

Answer 10

10.0.0.0 - 10.255.255.255

Question 11

What is the range of Class B private address range?

Answer 11

172.16.0.0 - 172.31.255.255

Question 12

What is the range of Class C private address range?

Answer 12

192.168.0.0 - 192.168.255.255

Question 13

Can a router be configured with one IP or a block of public IP addresses?

Answer 13

Yes

Question 14

What does NAT stand for?

What does NAT do?

Where is NAT used?

Answer 14

Network Address Translation

Translates between public and private IP’s

Used in Routers

Question 15

Does a proxy server need or not need a public IP on the external-facing interface?

Answer 15

Need

Question 16

What is is Class D IP Addressing used for?

What’s the range?

Answer 16

Multicasting

224.0.0.0 - 239.255.255.255

Question 17

What range is 224.0.0.0 - 239.255.255.255 used for?

What Class letter is it?

Answer 17

Multicasting

D

Question 18

What is is Class E IP Addressing used for?

What’s the range?

Answer 18

Experimental Use and Testing

240.0.0.0 through 255.255.255.255

Question 19

What range is 240.0.0.0 through 255.255.255.255 used for?

What Class letter is it?

Answer 19

Experimental Use and Testing

E

Question 20

What’s a loopback address used for?

What range is it?

Answer 20

Checks TCP/IP is correctly configured on local host

127.0.0.0 - 127.255.255.255

Question 21

Does a loopback interface require a physical interface to function?

Answer 21

No

Question 22

What is every IP host’s default loopback address?

Answer 22

127.0.0.1

Question 23

What name is the loopback address associated with?

Answer 23

localhost

Question 24

What is 0.0.0.0/8 typically used for?

Answer 24

A client seeking DHCP lease

Question 25

What is 255.255.255.255 used for?

Answer 25

BROADCAST to local network when local network is not known

Question 26

What are 192.0.2.0/24 198.51.100.0/24 203.0.113.0/24 used for?

Answer 26

Set aside for documentation and examples

Question 27

What are factors to know when planning an IPv4 network addressing scheme? (4) (Think simple)

Answer 27

Number of IP networks and subnetworks Number of hosts per subnet Network ID must be valid public/private range Network ID must be unique on the internet

Question 28

What 2 problems does Classless Addressing solve over Classful Addressing?

Answer 28

Class B addresses becoming scarce Exponential growth in Internet routing tables

Question 29

What does CIDR mean?

Answer 29

Classless Inter-Domain Routing

Question 30

How does CIDR work? (2)

Answer 30

Route Aggregation (Supernetting) Flexible Subnetting (VLSM)

Question 31

What does VLSM stand for?

Answer 31

Variable Length Subnet Masking

Question 32

What does VLSM do?

Answer 32

Allows network designer to allocate ranges of IP addresses to subnets that match the predicted need more closely Right range for the right segment of the network!