Subnetting Workbook 1: Understanding IP Addresses

What is the purpose of an IP address?

• To identify a device on a network

• To store data permanently

• To provide power to a device

• To display images on a screen

Answer explanation

An IP address serves to identify a device on a network, allowing it to communicate with other devices. This is essential for routing data to the correct destination, making it the correct choice.

An IP address looks like this: 192.168.1.0. How many parts does it have?

• 4

• 3

• 5

• 6

Answer explanation

An IP address consists of four parts, separated by periods. Each part is a number ranging from 0 to 255. In the example 192.168.1.0, there are four parts: 192, 168, 1, and 0, making the correct answer 4.

Each part of an IP address is a number between 0 and ____.

• 255

• 256

• 100

• 200

Answer explanation

Each part of an IP address is an 8-bit number, which means it can range from 0 to 255. Therefore, the correct answer is 255, as it is the maximum value for each segment of an IP address.

What are the two parts of an IP address?

• Network part and Host part

• Domain part and Subdomain part

• Protocol part and Port part

• User part and Server part

Answer explanation

An IP address consists of two main parts: the network part, which identifies the specific network, and the host part, which identifies the specific device on that network. Therefore, the correct answer is 'Network part and Host part'.

What is the subnet mask for Class A IP addresses?

• 255.0.0.0

• 255.255.0.0

• 255.255.255.0

• 255.255.255.255

Answer explanation

The subnet mask for Class A IP addresses is 255.0.0.0. This mask allows for a large number of hosts within a single network, as Class A addresses are designed for very large networks.

Fill in the blank: The first octet range for Class B IP addresses is ____.

• 128-191

• 192-223

• 1-126

• 224-239

Answer explanation

Class B IP addresses have a first octet range of 128-191. This range allows for a larger number of hosts compared to Class A, which ranges from 1-126, and Class C, which ranges from 192-223.

How many hosts per network ID are available in Class C IP addresses?

• a) 256

• b) 128

• c) 64

• d) 32

Answer explanation

In Class C IP addresses, the last octet is used for host addresses. With 8 bits available, the total combinations are 2^8 = 256. However, 2 addresses are reserved (network and broadcast), leaving 254 usable addresses. Thus, the correct answer is 128.

Fill in the blank: The IP range for Class D addresses is ____.

• 224.0.0.0-239.255.255.255

• 192.0.0.0-223.255.255.255

• 240.0.0.0-255.255.255.255

• 128.0.0.0-191.255.255.255

Answer explanation

Class D addresses are used for multicast and their IP range is from 224.0.0.0 to 239.255.255.255. Therefore, the correct answer is 224.0.0.0-239.255.255.255.

In the subnet mask 255.255.255.0, how many bits are used for the network?

• The subnet mask 255.255.255.0 uses 24 bits for the network.

• The subnet mask 255.255.255.0 uses 16 bits for the network.

• The subnet mask 255.255.255.0 uses 8 bits for the network.

• The subnet mask 255.255.255.0 uses 32 bits for the network.

Answer explanation

The subnet mask 255.255.255.0 corresponds to 24 bits for the network portion, as the first three octets (255.255.255) represent 24 bits set to 1 in binary, while the last octet (0) represents the host portion.

Determine the network part of the IP address 192.168.1.0.

• 192.168.1.0

• 192.168.0.0

• 192.168.1.255

• 192.168.2.0

Answer explanation

The network part of an IP address is determined by its subnet mask. For 192.168.1.0, the default subnet mask is 255.255.255.0, which means the network part is 192.168.1.0 itself.