Network+ Certification Test On Subnetting!

1.

An IP Address is _____ bits.

Explanation
An IP address is represented by a 32-bit binary number. This means that it consists of 32 digits, each of which can be either a 0 or a 1. The 32 bits are divided into four groups of 8 bits each, separated by periods, to form the familiar decimal format of an IP address. This format allows for a total of 4.3 billion unique IP addresses to be assigned, which is sufficient for the current needs of the internet.

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2.

An IP Address is ____ bytes.

Explanation
An IP address is represented by a 32-bit binary number, which is equivalent to 4 bytes. Each byte consists of 8 bits, resulting in a total of 32 bits. Therefore, the correct answer is 4.

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3.

IP Addresses are in Layer _____.

Explanation
IP addresses are in Layer 3 of the OSI model. This layer is known as the Network layer and is responsible for routing and forwarding data packets across different networks. IP addresses are used to uniquely identify devices on a network and are essential for the proper functioning of internet communication.

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4.

IP address range of: 1 to 127 is in what class?

Explanation
The IP address range of 1 to 127 is in Class A. Class A addresses are used for large networks with a large number of hosts. The first octet of a Class A address is reserved for the network ID, while the remaining three octets are used for host IDs. The range of 1 to 127 falls within the range of Class A addresses.

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5.

IP Address in the range of: 192 to 223 is in what class?

Explanation
IP addresses in the range of 192 to 223 belong to Class C. Class C addresses are used for medium-sized networks and have a default subnet mask of 255.255.255.0. The first octet of Class C addresses ranges from 192 to 223, allowing for a maximum of 2,097,152 unique network addresses.

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6.

Which two statements describe the IP address 10.16.3.65/23? 1. The subnet address is 10.16.3.0 255.255.254.0. 2. The lowest host address in the subnet is 10.16.2.1 255.255.254.0. 3. The last valid host address in the subnet is 10.16.2.254 255.255.254.0. 4. The broadcast address of the subnet is 10.16.3.255 255.255.254.0.

A.

1 and 4
B.

2 and 4
C.

1, 2 and 4
D.

2, 3 and 4

Correct Answer
A. 1 and 4

Explanation
The subnet address is 10.16.3.0 255.255.254.0.
True. The subnet address is the lowest address in the subnet range, which is 10.16.2.0/23 in this case.
The lowest host address in the subnet is 10.16.2.1 255.255.254.0.
False. The lowest host address in the subnet would be one more than the subnet address, so it is 10.16.2.1 in this case.
The last valid host address in the subnet is 10.16.2.254 255.255.254.0.
False. The last valid host address in the subnet would be the broadcast address minus one, so it is 10.16.3.254 in this case.
The broadcast address of the subnet is 10.16.3.255 255.255.254.0.
True. The broadcast address is the highest address in the subnet range, which is 10.16.3.255 in this case.

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7.

What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?

A.

14
B.

15
C.

16
D.

30

Correct Answer
D. 30

Explanation
The subnet mask 255.255.255.224 is a /27 subnet, which means it has 27 network bits and 5 host bits. With 5 host bits, we can have 2^5 - 2 = 30 usable host addresses. The -2 accounts for the network address and the broadcast address, which cannot be assigned to individual hosts. Therefore, the maximum number of IP addresses that can be assigned to hosts on this subnet is 30.

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8.

You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which classful subnet mask would you use?

A.

255.255.255.192
B.

255.255.255.224
C.

255.255.255.240
D.

255.255.255.248

Correct Answer
B. 255.255.255.224

Explanation
The subnet mask 255.255.255.224 would be used in this case. This subnet mask allows for 30 usable host addresses per subnet, which is more than the required minimum of 16 hosts per subnet. The other subnet masks listed (255.255.255.192, 255.255.255.240, and 255.255.255.248) would provide fewer usable host addresses per subnet and therefore would not meet the requirement of at least 16 hosts per subnet.

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9.

You have a network that needs 29 subnets while maximizing the number of host addresses available on each subnet. How many bits must you borrow from the host field to provide the correct subnet mask?

A.

2
B.

3
C.

4
D.

5

Correct Answer
D. 5

Explanation
To create 29 subnets, we need to borrow enough bits from the host field to represent 29 subnets. The formula to calculate the number of subnets is 2^n, where n is the number of borrowed bits. By trying different values, we can see that borrowing 5 bits will give us 32 subnets, which is more than the required 29 subnets. Therefore, to provide the correct subnet mask, we must borrow 5 bits from the host field.

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10.

What is the subnetwork number of a host with an IP address of 172.16.66.0/21?

A.

172.16.36.0
B.

172.16.48.0
C.

172.16.64.0
D.

172.16.0.0

Correct Answer
C. 172.16.64.0

Explanation
The given IP address is 172.16.66.0/21, which means it belongs to a subnet with a network address of 172.16.64.0. In a /21 subnet, the first three octets (172.16.64) represent the network address, and the last octet (0) represents the host address. Therefore, the subnetwork number of the given host IP address is 172.16.64.0.

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