IPv4 Addressing and Classes Quiz

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Questions and Answers

Which class of IPv4 address has the highest number of host bits available?

Class B

Class C

Class D

Class A (correct)

What is the primary function of private IP addresses?

To be assigned dynamically by ISPs

To be used specifically on internal networks (correct)

To facilitate Internet data traffic

To be routed across public networks

How many network bits does a Class B IPv4 address use?

16 (correct)

Which organization is responsible for assigning IP address space to ISPs and end users in North America?

ARIN Signup and view all the answers

What best describes non-routable IP addresses?

They are blocked by Internet Service Providers. Signup and view all the answers

What must an end user typically do to qualify for a block of IP addresses from ARIN?

Be large enough to merit an allocation Signup and view all the answers

What is the structure of a 32-bit IPv4 address comprised of?

Four octets with designated network and host bits Signup and view all the answers

Which class of IPv4 address has the least number of host address bits available?

Class C Signup and view all the answers

What is a key characteristic of private IP addresses?

They are intended for use on internal networks. Signup and view all the answers

Why does ARIN only assign IP address space to qualified ISPs and end users?

To maintain a structured and managed allocation process. Signup and view all the answers

Which of the following statements best describes the 'network bits' for Class C IPv4 addresses?

They consist of 24 bits. Signup and view all the answers

Which IPv4 class can support the largest number of total networks?

Class A Signup and view all the answers

What does the term 'non-routable IP address' imply?

These addresses cannot be routed on the Internet. Signup and view all the answers

What is the total number of host bits available for Class B IP addresses?

16 bits Signup and view all the answers

Which organization is responsible for managing IP address assignments in North America?

ARIN Signup and view all the answers

What is the primary difference between public and private IPv4 addresses?

Public addresses can be routed on the Internet, private addresses cannot. Signup and view all the answers

Study Notes

IPv4 Addressing

IPv4 addresses are 32 bits long
Addresses are divided into four octets (each 8 bits)
Octets are separated by periods (e.g., 192.168.1.1)
Decimal values are used to represent the binary octets
Different classes of IP addresses exist (A, B, C, D, E)
These classes have different ranges of values and affect how the network and host portions of the address are determined

IP Address Classes and Ranges

Class A: 0.0.0.0 to 126.255.255.255
Class B: 128.0.0.0 to 191.255.255.255
Class C: 192.0.0.0 to 223.255.255.255
Class D: 224.0.0.0 to 239.255.255.255
Class E: 240.0.0.0 to 254.255.255.255

Structure of a 32-bit IPv4 Address

Consists of four octets
Each octet is a group of 8 bits, representing a decimal value between 0 and 255
Example: 10.10.20.1 (decimal) represented as 00001010.00001010.00010100.00000001 (binary)

Network and Host Portions by Class

The octets that define a network differ depending on the class of IP address.
Network portion precedes the Host portion in the address
Class A has 8 bits as network, 24 as hosts
Class B has 16 bits as network, 16 as hosts
Class C has 24 bits as network, 8 as hosts

Number of Host Addresses by Class

Class A: 16,777,214 hosts
Class B: 65,534 hosts
Class C: 254 hosts

Private IP Addresses

Some address ranges are designated for private use on internal networks (Intranets)
10.0.0.0 to 10.255.255.255 (Class A)
172.16.0.0 to 172.31.255.255 (Class B)
192.168.0.0 to 192.168.255.255 (Class C)
Private IP addresses are not routable on the public internet.

ARIN - American Registry for Internet Numbers

ARIN is responsible for allocating IP addresses to ISPs and large organizations
ISPs are awarded blocks of addresses.
ISPs sometimes issue addresses to end-users

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Description

Test your knowledge on IPv4 addressing and the various classes of IP addresses. This quiz covers the structure of a 32-bit IPv4 address, its octets, and the network and host portions derived from different classes. Ideal for networking students and professionals seeking to refresh their understanding of IP addressing.