Powers of 2 are important to understand and memorize for use with IP subnetting. Reviewing
21 = 2
22 = 4
23 = 8
24 = 16
25 = 32
26 = 64
27 = 128
28 = 256
29 = 512
210 = 1,024
211 = 2,048
212 = 4,096
213 = 8,192
214 = 16,384
Memorizing these powers of 2 is a good idea, but it’s not absolutely necessary. Just
remember that since you’re working with powers of 2, each successive power of 2 is
double the previous one.
powers of 2, remember that when you see a number noted with an exponent, it means
you should multiply the number by itself as many times as the upper number specifies. For
example, 23 is 2 x 2 x 2, which equals 8. Here’s a list of powers of 2 to commit to memory
22 = 4
23 = 8
24 = 16
25 = 32
26 = 64
27 = 128
28 = 256
29 = 512
210 = 1,024
211 = 2,048
212 = 4,096
213 = 8,192
214 = 16,384
Memorizing these powers of 2 is a good idea, but it’s not absolutely necessary. Just
remember that since you’re working with powers of 2, each successive power of 2 is
double the previous one.