IPv4 Subnetting Quiz

Which subnet mask would provide exactly 4 bits for host addresses?

What components make up an IPv4 address?

If a device has a /26 subnet mask, how many usable IP addresses are available for hosts?

What type of address is represented by 172.17.4.250/24?

With a subnet mask of /28, how many total IP addresses are available in the subnet?

What is the primary purpose of a subnet mask when used with an IP address?

If the smallest subnet has a mask of 255.255.255.224, how many usable host addresses are there?

How is the subnet mask represented in CIDR notation for 255.255.255.240?

What is the prefix length notation for the subnet mask 255.255.255.224?

How many valid host addresses are available on an IPv4 subnet configured with a /26 mask?

Which subnet mask corresponds to a scenario where 5 host bits are available?

How many equal-sized subnets are created when subnetting the 192.168.10.0/24 network into /26 masks?

What subnet mask is represented by the slash notation /20?

What is a true statement about variable-length subnet masking (VLSM)?

What is the purpose of the ANDing process performed by a Layer 3 device on a destination IP address and subnet mask?

How many usable IP addresses are there in the 192.168.1.0/27 network?

IPv4 Subnetting

Prefix Length Notation: Represents the subnet mask. For example, /27 means the first 27 bits of the IP address represent the network.
Subnet Mask Calculation: Convert the subnet mask (e.g., 255.255.255.224) to binary to determine the number of network bits.
Calculating Available Host Addresses: Subtract the number of network bits from 32 (total bits in an IPv4 address) to get the number of host bits. Calculate 2^{(number of host bits)} to find the total number of addresses. Subtract 2 (for network and broadcast addresses) from the total addresses to find the usable (valid) host addresses.
VLSM: Variable Length Subnet Masking allows for subnets of different sizes by borrowing different numbers of host bits.
Subnet Mask and IP Address: The ANDing of an IP address and subnet mask determines the network address.
Number of Subnets: The number of subnets created depends on the number of bits borrowed for subnetting (2^{(borrowed_bits)}).
Usable Addresses: Usable host addresses equal the total addresses minus the network and broadcast addresses (2).

Key Examples and Calculations

/26 Mask: Provides 62 usable host addresses (6 bits for hosts, 64 total, minus 2 = 62)
5 Host Bits: Requires a /27 subnet mask (255.255.255.224).
/20 Mask: Represents the subnet mask 255.255.224.0.
192.168.1.0/27 Network: Contains 30 usable host addresses ( 5 bits for hosts, 32 total, - 2 = 30)
/28 Mask: A /28 mask provides 14 usable host addresses (4 bits for hosts, 16 total, minus 2 = 14).

Test your understanding of IPv4 subnetting concepts including prefix length notation, subnet mask calculations, and the Variable Length Subnet Masking (VLSM) technique. This quiz covers everything you need to know about determining available host addresses and calculating the number of subnets. Challenge yourself and see how well you grasp these crucial networking topics!