Question

How many /64 subnets can be created within a /56 prefix? Answers: a. 1024 b. 2048 c. 512 d. 256. d. 256.

Answer 1

A /56 prefix can create 256 /64 subnets.

Step-by-step explanation:

In IPv6 addressing, each subnet is represented by a /64 prefix. The number following the slash indicates the number of bits used for the network portion of the address.

A /56 prefix has 56 bits for the network portion. To calculate the number of /64 subnets within a /56 prefix, we subtract 56 from 64: 64 - 56 = 8.

Therefore, a /56 prefix can create 2^8 or 256 /64 subnets.

Answer 2

256 /64 subnets can be created within a /56 prefix. The Option D.

In IPv6 addressing, each subnet is typically assigned a /64 prefix. A /64 prefix consists of 64 bits.

A /56 prefix consists of 56 bits. To calculate how many /64 subnets can be created within a /56 prefix, you need to find out how many bits are available for subnetting within the /56 prefix.

To do this, you subtract 56 from 64:

= 64 (bits in a /64 prefix) - 56 (bits in a /56 prefix)

= 8 bits

So, within a /56 prefix, there are 8 bits available for subnetting.

To find the number of subnets that can be created with 8 bits, you use the formula 2^n where 'n' is the number of bits available.

In this case, it's 2^8 = 256.

Therefore, within a /56 prefix, you can create 256 /64 subnets.