Classful addressing (Class A, B, C) in Computer Networks - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Identify the Class of an IP Address

Given the IP address 130.25.50.1, which class does it belong to?

A Class C

B Class B

C Class A

D Class D

💡 Hint

Look at the first number in the IP address and compare it to the class ranges.

The first octet is 130, which falls between 128 and 191. This range corresponds to Class B addresses.

📋 Factual

intermediate

Number of Hosts in Class C Network

How many usable host addresses are available in a Class C network?

A 254

B 256

C 65534

D 16,777,214

💡 Hint

Remember to subtract network and broadcast addresses from total hosts.

Class C networks have 8 bits for hosts, so 2^8 = 256 addresses. Subtracting 2 for network and broadcast leaves 254 usable hosts.

🔍 Analysis

advanced

Determine Network Class from Binary

The first octet of an IP address in binary is 01100010. What is the class of this IP address?

A Class A

B Class E

C Class C

D Class B

💡 Hint

Check the first few bits to identify the class.

Class A addresses start with 0, Class B with 10, Class C with 110. The binary 01100010 starts with 0 and then 1, which is decimal 98. Since 98 is between 128 and 191? No, 98 is between 1 and 126, so Class A. But the binary starts with 0, so Class A.

❓ Comparison

advanced

Compare Network Sizes of Class A and Class B

Which statement correctly compares the number of possible hosts in Class A and Class B networks?

A Class A supports more hosts than Class B because it has more host bits.

B Class B supports more hosts than Class A because it has more network bits.

C Class A and Class B support the same number of hosts.

D Class B supports more hosts than Class A because it has fewer network bits.

💡 Hint

Think about how many bits are used for hosts in each class.

Class A uses 24 bits for hosts, Class B uses 16 bits. More host bits mean more hosts.

❓ Reasoning

expert

Identify the Class from IP Range and Explain

An organization has an IP address starting with 192.168.5.10. Which class does this IP belong to and why is it commonly used in private networks?

A Class A; because it allows many hosts and is reserved for private use.

B Class B; because it balances network and host bits and is public.

C Class C; because it has a smaller network size and is reserved for private use.

D Class D; because it is used for multicast and private addressing.

💡 Hint

Check the first octet range and recall private IP address ranges.

192.168.x.x addresses are Class C and are part of private IP ranges used inside local networks.