Understanding IP Address Classes

What are the five classes of IP addresses defined by TCP/IP?

• Class 1, Class 2, Class 3, Class 4, Class 5

• Class F, Class G, Class H, Class I, Class J

• Class A, Class B, Class C, Class D, Class E

• Class A1, Class B1, Class C1, Class D1, Class E1

Answer explanation

The correct answer is Class A, Class B, Class C, Class D, Class E. These classes categorize IP addresses based on their range and usage, with Class A, B, and C for unicast, Class D for multicast, and Class E for experimental purposes.

Which classes of IP addresses can be used for host addresses?

• Class F

• Classes A, B, and C

• Class D

• Class E

Answer explanation

Classes A, B, and C are designated for host addresses, allowing devices to communicate on a network. Class D is used for multicast, Class E is reserved for experimental use, and Class F is not a standard class.

What is the purpose of Class D IP addresses?

• To enable secure communication between two endpoints.

• To assign static IP addresses to servers.

• The purpose of Class D IP addresses is to facilitate multicast communication.

• To provide a unique IP address for every device on a network.

Answer explanation

Class D IP addresses are specifically designated for multicast communication, allowing data to be sent to multiple recipients simultaneously, which distinguishes them from other classes that serve different purposes.

What is the purpose of Class E IP addresses?

• The purpose of Class E IP addresses is for experimental use.

• The purpose of Class E IP addresses is for routing purposes.

• The purpose of Class E IP addresses is for public use.

• The purpose of Class E IP addresses is for private networks.

Answer explanation

Class E IP addresses, ranging from 240.0.0.0 to 255.255.255.255, are reserved for experimental use and are not intended for public or private networks, making the first choice the correct answer.

How is the class of an IP address determined?

• The class of an IP address is determined by the value of the first octet.

• The class of an IP address is determined by the last octet.

• The class of an IP address is determined by the network speed.

• The class of an IP address is determined by the subnet mask.

Answer explanation

The class of an IP address is determined by the value of the first octet. Each class (A, B, C, etc.) has a specific range of values for the first octet, which defines the network and host portions of the address.

What is the range of valid IP addresses for Class A?

• 1.0.0.0 to 126.255.255.255

• 192.0.0.0 to 223.255.255.255

• 0.0.0.0 to 255.255.255.255

• 128.0.0.0 to 191.255.255.255

Answer explanation

Class A IP addresses range from 1.0.0.0 to 126.255.255.255. This range excludes 0.0.0.0, which is reserved, and 127.0.0.0, which is used for loopback. Therefore, the correct choice is 1.0.0.0 to 126.255.255.255.

How many bits represent the network part in Class A IP addresses?

• 5 bits

• 7 bits

• 10 bits

• 8 bits

Answer explanation

In Class A IP addresses, the first octet indicates the network part. The first bit is always '0', leaving 7 bits for the network address, which allows for 128 possible networks. Thus, the correct answer is 7 bits.

How many bits represent the host part in Class B IP addresses?

• 16 bits

• 24 bits

• 8 bits

• 32 bits

Answer explanation

In Class B IP addresses, the first two octets (16 bits) are used for the network part, leaving 16 bits for the host part. Therefore, the correct answer is 16 bits.

What is the primary use of Class C IP addresses?

• To provide IP addresses for public web servers.

• To allocate IP addresses for large enterprise networks.

• To allocate IP addresses for small to medium-sized networks.

• To assign IP addresses for data centers and cloud services.

Answer explanation

Class C IP addresses are primarily used to allocate IP addresses for small to medium-sized networks, making them suitable for businesses and organizations that do not require a large number of addresses.

Why was Class A created in the IP address classification?

• Class A was established for experimental purposes.

• Class A was designed for secure communication only.

• Class A was created for small networks with few hosts.

• Class A was created for large networks with many hosts.

Answer explanation

Class A was created to accommodate large networks, allowing for a significant number of hosts. This classification supports organizations that require extensive IP address allocations.