01
Front
How many bits are in an IPv4 address?
Back
An IPv4 address is 32 bits long and is usually written as four decimal octets.
Free Online Flashcard Deck
2 Subnet and Host Range Calculations Free Online FlashCards
Study 2 Subnet and Host Range Calculations with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
12 cards
02
Front
What does the CIDR prefix /p specify?
Back
A prefix /p indicates that the first p bits identify the network; the remaining 32 − p bits identify addresses within it.
03
Front
How do you calculate the total addresses in an IPv4 prefix /p?
Back
A prefix /p contains 232−p total addresses.
04
Front
How are usable hosts typically calculated for an ordinary /0–/30 subnet?
Back
For ordinary /0 through /30 subnets, usable hosts are typically 232−p−2. The network and directed broadcast addresses are excluded.
05
Front
What is the subnet mask for /26?
Back
The subnet mask for /26 is 255.255.255.192.
06
Front
How do you find the block size for /26?
Back
Subtract the mask value in the first octet that is not 255 from 256. For /26, 256−192=64, so the last-octet boundaries are 0, 64, 128, and 192.
07
Front
For 192.168.1.77/26, what are the network and broadcast addresses?
Back
192.168.1.64 is the network address, and 192.168.1.127 is the broadcast address.
08
Front
What is the usable host range for 192.168.1.77/26?
Back
The usable host range is 192.168.1.65–192.168.1.126, containing 62 addresses.
09
Front
For 172.16.35.123/20, what are the network and broadcast addresses?
Back
The /20 block size in the third octet is 16. Since 35 falls in 32–47, the network is 172.16.32.0 and the broadcast address is 172.16.47.255.
10
Front
How many total and typically usable addresses are in a /20 subnet?
Back
It contains 212=4096 total addresses and typically 4094 usable host addresses.
11
Front
What happens to subnet size as the prefix gets longer?
Back
A longer prefix leaves fewer host bits, so it creates smaller subnets.
12
Front
What results from splitting a /24 into /27 subnets?
Back
Borrowing 3 bits creates 23=8 subnets. Each /27 has 32 total addresses and typically 30 usable hosts.
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