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Questions and Answers
What is the correct prefix length notation for the subnet mask 255.255.255.224?
What is the correct prefix length notation for the subnet mask 255.255.255.224?
How many valid host addresses can be configured in a subnet with a /26 mask?
How many valid host addresses can be configured in a subnet with a /26 mask?
Which subnet mask corresponds to 5 available host bits?
Which subnet mask corresponds to 5 available host bits?
If a network administrator subnets a 192.168.10.0/24 network with /26 masks, how many equal-sized subnets are formed?
If a network administrator subnets a 192.168.10.0/24 network with /26 masks, how many equal-sized subnets are formed?
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What is the subnet mask represented by the slash notation /20?
What is the subnet mask represented by the slash notation /20?
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Which statement accurately describes variable-length subnet masking?
Which statement accurately describes variable-length subnet masking?
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What is the purpose of the ANDing process performed by a Layer 3 device on a destination IP address and subnet mask?
What is the purpose of the ANDing process performed by a Layer 3 device on a destination IP address and subnet mask?
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How many usable IP addresses are available on the 192.168.1.0/27 subnet?
How many usable IP addresses are available on the 192.168.1.0/27 subnet?
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How many usable host addresses are available in a subnet with a mask of 255.255.255.224?
How many usable host addresses are available in a subnet with a mask of 255.255.255.224?
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What is the subnet mask that allows for exactly 16 total addresses?
What is the subnet mask that allows for exactly 16 total addresses?
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Which component identifies the unique host on a network in IPv4 addressing?
Which component identifies the unique host on a network in IPv4 addressing?
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If a device has an IP address of 172.17.4.250 with a /24 mask, what type of address is it?
If a device has an IP address of 172.17.4.250 with a /24 mask, what type of address is it?
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What is the primary function of a subnet mask?
What is the primary function of a subnet mask?
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How many bits remain for hosts with a subnet mask of /26?
How many bits remain for hosts with a subnet mask of /26?
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What is the total number of addresses provided by a subnet with a mask of 255.255.255.240?
What is the total number of addresses provided by a subnet with a mask of 255.255.255.240?
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With a /28 network mask, what is the maximum number of usable host addresses?
With a /28 network mask, what is the maximum number of usable host addresses?
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IPv4 addresses are composed of 32 bits.
IPv4 addresses are composed of 32 bits.
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Study Notes
IPv4 Subnetting
- Prefix Length Notation: Represents the subnet mask. A /27 mask corresponds to 255.255.255.224.
Calculating Usable Hosts
- Calculating Usable Hosts: To obtain the number of usable hosts on a subnet, subtract 2 from the total number of addresses (network & broadcast excluded). For /26, you have 64 total addresses, and 62 usable addresses.
Determining Subnet Masks
- Host Bits and Subnet Masks: The number of host bits determines the subnet mask. Five host bits yield a /27 mask (255.255.255.224). Four host bits produce a /28 mask (255.255.255.240).
Subnet Creation
- Calculating Subnets: Subnetting a /24 network with /26 masks results in 4 subnets (calculating via 2 to the power of the difference in mask values).
Slash Notation Conversions
- Slash Notation to Decimal: A /20 mask translates to 255.255.224.0 in decimal format.
Variable-Length Subnet Masking (VLSM)
- VLSM Flexibility: Variable-length subnet masking allows you to create subnets of different sizes according to network needs.
IP Address ANDing
- Network Address Identification: ANDing the destination IP address and subnet mask extracts the network address of the destination network.
Calculating Available Addresses
- Usable Addresses Calculation: On a /27 subnet, there are 32 total addresses, yielding 30 usable addresses (total - network - broadcast).
Components of an IPv4 Address
- IP Address Components: An IPv4 address consists of a network portion and a host portion, delineated by the subnet mask.
Host Address Identification
- Host Address Recognition: An IP address like 172.17.4.250/24 falls within the range between the network and broadcast address, identifying it as a host address.
Calculating Usable Hosts Continued
- Calculating Usable Hosts (Specific Cases): On a /28 subnet, there are 16 total addresses, which translates to 14 usable host addresses.
Subnet Mask Purpose
- Subnet Identification: A subnet mask determines the subnet a host belongs to by marking the network part of the IP address.
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Description
Test your knowledge on IPv4 subnetting concepts including prefix length notation, calculating usable hosts, and subnet creation techniques. This quiz will cover essential topics like subnet masks and variable-length subnet masking (VLSM).
