2.5 IPv4

Question 1

What is the structure of an IPv4 address?

Answer 1

A 32-bit address, written as four decimal numbers separated by dots (e.g., 192.168.1.4).

Question 2

How many bits are in an IPv4 address?

Answer 2

32 bits.

Question 3

What is the purpose of a subnet mask?

Answer 3

It defines the network and host portions of an IP address.

Question 4

What is the default subnet mask for a Class A network?

Answer 4

255.0.0.0

Question 5

What is the default subnet mask for a Class B network?

Answer 5

255.255.0.0

Question 6

What is the default subnet mask for a Class C network?

Answer 6

255.255.255.0

Question 7

What is the IP address range for Class A?

Answer 7

1.0.0.0 - 127.255.255.255

Question 8

What is the IP address range for Class B?

Answer 8

128.0.0.0 - 191.255.255.255

Question 9

What is the IP address range for Class C?

Answer 9

192.0.0.0 - 223.255.255.255

Question 10

What is the purpose of Class D addresses?

Answer 10

Reserved for multicast communication (224.0.0.0 - 239.255.255.255).

Question 11

What is the purpose of Class E addresses?

Answer 11

Reserved for experimental use (240.0.0.0 - 255.255.255.255).

Question 12

What are the three private IP address ranges?

Answer 12

10.0.0.0 - 10.255.255.255 (Class A), 172.16.0.0 - 172.31.255.255 (Class B), 192.168.0.0 - 192.168.255.255 (Class C).

Question 13

What is a public IP address?

Answer 13

An IP address routable over the internet, assigned by ISPs.

Question 14

What is a private IP address?

Answer 14

An IP address used within a local network (LAN) that is not routable over the internet.

Question 15

What is the loopback address?

Answer 15

127.0.0.1, used for local network testing.

Question 16

What is an APIPA address?

Answer 16

169.254.x.x, automatically assigned when DHCP fails.

Question 17

What does CIDR stand for?

Answer 17

Classless Inter-Domain Routing.

Question 18

How does CIDR notation work?

Answer 18

It replaces traditional subnet masks (e.g., /24 is the same as 255.255.255.0).

Question 19

What is the CIDR notation for a Class C network?

Answer 19

/24 (255.255.255.0)

Question 20

What is the CIDR notation for a Class B network?

Answer 20

/16 (255.255.0.0)

Question 21

What is the CIDR notation for a Class A network?

Answer 21

/8 (255.0.0.0)

Question 22

How does subnetting help networks?

Answer 22

It divides a large network into smaller, more manageable subnetworks.

Question 23

How many hosts can a /24 subnet support?

Answer 23

254 usable hosts (256 total, minus network and broadcast addresses).

Question 24

What does an IP address ending in .0 represent?

Answer 24

The network address.

Question 25

What does an IP address ending in .255 represent?

Answer 25

The broadcast address.