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3 IPv4 Subnetting Practice Free Online FlashCards

Study 3 IPv4 Subnetting Practice with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.

12 cards

Front

How many host bits does an IPv4 prefix $/n$ leave?

Back

A prefix $/n$ leaves $32-n$ host bits in an IPv4 address.

Front

How does a prefix length determine an IPv4 subnet mask?

Back

The subnet mask has $n$ leading 1s followed by 0s. For example, $/26$ is 255.255.255.192.

Front

How do you calculate the total addresses in a $/n$ subnet?

Back

A subnet contains $2^{32-n}$ total addresses.

Front

What is the usual usable-host count for an ordinary IPv4 subnet?

Back

For ordinary subnets from $/0$ through $/30$ , usable hosts are typically the total address count minus two.

Front

How do network and broadcast addresses differ in their host bits?

Back

The network address has all host bits set to 0; the broadcast address has all host bits set to 1.

Front

How does the block-size method find an IPv4 subnet's block size?

Back

In the first mask octet that is neither 255 nor 0, subtract its value from 256 to get the block size.

Front

For 192.168.10.77/26, what are the network and broadcast addresses?

Back

The network is 192.168.10.64 and the broadcast is 192.168.10.127.

Front

What is the usable host range for 10.23.77.9/20?

Back

The usable range is 10.23.64.1–10.23.79.254.

Front

What is the smallest prefix that supports at least 50 usable hosts?

Back

Choose $/26$ : it provides 62 typical usable host addresses.

Front

What allocation order helps place multiple VLSM subnets efficiently?

Back

Allocate the largest subnet first, then place smaller subnets on valid block boundaries in the remaining address space.

Front

What are the special uses of IPv4 prefixes $/31$ and $/32$ ?

Back

The usual subtract-two rule has exceptions: $/31$ is used for two-address point-to-point links, and $/32$ identifies a single address.

Front

Divide 192.168.20.0/24 into /27 subnets: how many are there?

Back

There are 8 subnets. Their first, third, and last network addresses are 192.168.20.0, 192.168.20.64, and 192.168.20.224.

3 IPv4 Subnetting Practice Free Online FlashCards

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