IPv4 Addressing Quiz

How many bits are in an IPv4 address?

• 16

• 32

• 64

• 128

Answer explanation

An IPv4 address consists of 32 bits, divided into four octets. Each octet is 8 bits, making a total of 32 bits. Therefore, the correct answer is 32.

In an IPv4 address, what does the subnet mask determine?

• Network and host bits

• Only host bits

• Only network bits

• MAC address

Answer explanation

The subnet mask in an IPv4 address defines which part of the address is the network portion and which part is the host portion. Therefore, it determines both network and host bits, making 'Network and host bits' the correct choice.

Which of the following is a valid subnet mask in decimal format?

• 255.255.255.255

• 255.0.255.0

• 255.255.248.0

• 255.255.0.255

Answer explanation

The valid subnet mask must have contiguous bits set to 1 followed by bits set to 0. 255.255.248.0 (11111111.11111111.11111000.00000000) meets this criterion, while the others do not.

In CIDR notation, what does /24 represent?

• 24 host bits

• 24 network bits

• 24 MAC addresses

• 24-bit subnet mask

Answer explanation

In CIDR notation, /24 indicates that 24 bits are used for the network portion of the address, leaving 8 bits for host addresses. This means it represents 24 network bits, not host bits or MAC addresses.

Which of these is a private IP address range?

• 192.0.0.0 to 192.255.255.255

• 172.32.0.0 to 172.63.255.255

• 10.0.0.0 to 10.255.255.255

• 1.0.0.0 to 1.255.255.255

Answer explanation

The private IP address range includes 10.0.0.0 to 10.255.255.255. The other options either fall within public IP ranges or do not meet the criteria for private addresses as defined by RFC 1918.

What is the first IP address in a subnet typically reserved for?

• Broadcast address

• Default gateway

• Network address

• Host device

Answer explanation

The first IP address in a subnet is typically reserved as the network address, which identifies the subnet itself. It cannot be assigned to a host device, making it essential for routing within the network.

What is the purpose of a MAC address in a LAN?

• To determine the subnet mask

• To uniquely identify devices on the same network

• To assign public IP addresses

• To translate domain names

Answer explanation

A MAC address serves to uniquely identify devices on the same network, allowing them to communicate effectively within a Local Area Network (LAN). This is essential for data transmission and network management.

How many IPv4 address classes are there?

• 3

• 4

• 5

• 6

Answer explanation

There are 5 classes of IPv4 addresses: Class A, B, C, D, and E. Each class serves different purposes, such as unicast, multicast, and experimental use, making the correct answer 5.

Which IPv4 address class is intended for the largest organizations?

• Class A

• Class B

• Class C

• Class D

Answer explanation

Class A addresses are designed for the largest organizations, allowing for over 16 million hosts on a single network. This makes them suitable for very large networks, unlike Classes B and C, which support fewer hosts.

What does CIDR stand for?

• Classful Internet Domain Routing

• Classless Inter-Domain Routing

• Continuous Internet Data Routing

• Controlled Internet Data Routing

Answer explanation

CIDR stands for Classless Inter-Domain Routing, which is a method for allocating IP addresses and routing Internet Protocol packets. It replaces the older classful system, allowing for more efficient use of IP address space.