01
Front
How many bits are in an IPv4 address?
Back
An IPv4 address is 32 bits long, divided into four 8-bit groups.
Free Online Flashcard Deck
1 IPv4 Addresses, Subnet Masks, and CIDR Free Online FlashCards
Study 1 IPv4 Addresses, Subnet Masks, and CIDR with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
12 cards
02
Front
What does a subnet mask identify?
Back
A subnet mask marks which bits belong to the network prefix and which remain for addresses within that prefix.
03
Front
What does the number in CIDR notation such as /26 mean?
Back
The number after the slash gives the number of leading bits in the network prefix.
04
Front
In 192.168.1.70/26, how many bits remain for hosts?
Back
It has 26 prefix bits and 6 remaining host bits.
05
Front
What bit pattern must a valid CIDR subnet mask have?
Back
The mask has contiguous 1 bits from the left, followed only by 0 bits.
06
Front
What dotted-decimal mask corresponds to /26?
Back
The first 24 bits fill three octets with 255; the remaining two prefix bits give 192. The mask is 255.255.255.192.
07
Front
What prefix length does 255.255.255.192 represent?
Back
It has 8 + 8 + 8 + 2 = 26 one-bits, so its prefix length is /26.
08
Front
What decimal value represents six leading 1 bits in an octet?
Back
Six set bits in an octet are 11111100 in binary, which is 252 in decimal.
09
Front
What decimal mask value represents a complete octet of prefix bits?
Back
A complete 8-bit group of prefix bits is 11111111 in binary, or 255 in decimal.
10
Front
What is an octet in an IPv4 address?
Back
An octet is one 8-bit group in an IPv4 address.
11
Front
What decimal range can an IPv4 octet represent?
Back
Each octet is written as a decimal number from 0 to 255.
12
Front
What does CIDR make explicit that historical classes did not?
Back
CIDR states the prefix length explicitly instead of inferring it from an address's historical class.
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