01
Front
What does the number in CIDR notation represent?
Back
A CIDR prefix gives the number of leading network bits; the remaining bits identify addresses within the subnet.
Free Online Flashcard Deck
3 IPv4 Subnet Calculation Practice Free Online FlashCards
Study 3 IPv4 Subnet Calculation Practice with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
12 cards
02
Front
How many host bits does an IPv4 `/24` have?
Back
An IPv4 address has 32 bits, so a `/24` prefix leaves 32−24=8 host bits.
03
Front
What subnet mask corresponds to `/26`?
Back
The mask for `/26` is `255.255.255.192`.
04
Front
How do you calculate an IPv4 network address from an IP and mask?
Back
Apply a bitwise AND to the IP address and subnet mask.
05
Front
How do you calculate total and usable addresses in an ordinary subnet?
Back
For an ordinary subnet with h host bits, total addresses are 2h, and usable hosts are 2h−2.
06
Front
What is the fourth-octet block size for a `/26` mask?
Back
The block size is 256−192=64.
07
Front
How do block size and octet value locate subnet boundaries?
Back
Boundaries are multiples of the block size. The boundary at or below the address's octet value is the network boundary; the next boundary minus one is broadcast.
08
Front
What is the network address of `192.168.10.77/26`?
Back
The network address is `192.168.10.64`; `.77` falls within the block from `.64` through `.127`.
09
Front
What is the broadcast address of `192.168.10.77/26`?
Back
The broadcast address is `192.168.10.127`, one less than the next boundary, `.128`.
10
Front
What is the usable host range for `192.168.10.77/26`?
Back
The usable range is `192.168.10.65–192.168.10.126`, containing 62 usable host addresses.
11
Front
How many host bits should you borrow to create at least S equal subnets?
Back
Borrow the smallest number b of host bits for which 2b≥S, where S is the required number of subnets.
12
Front
What prefix divides `192.168.20.0/24` into four equal subnets?
Back
Borrow 2 bits because 22=4, giving a new prefix of `/26`.
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