CCNA1 6 Addressing the Network - IPv4(6)

CCNA1 第六章

When we interpret a byte as a decimal number, we have the quantity that position represents if the digit is a 1 and we do not have that quantity if the digit is a 0, as shown in the figure.

1 1 1 1 1 1 1 1

128 64 32 16 8 4 2 1

A 1 in each position means that we add the value for that position to the total. This is the addition when there is a 1 in each position of an octet. The total is 255.

128 + 64 + 32 + 16 + 8 + 4 + 2 + 1 = 255

A 0 in each position indicates that the value for that position is not added to the total. A 0 in every position yields a total of 0.

0 0 0 0 0 0 0 0

128 64 32 16 8 4 2 1

0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 = 0

Notice in the figure that a different combination of ones and zeros will yield a different decimal value. Display Media Text Transcript | Display Visual Media

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