Exam 11: Data Networks

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A 512-bit data file is to be transferred with asynchronous transmission packets that each contain a start bit, an 8-bit data byte, a parity bit, and one stop bit.How many bits are transmitted over achannel?

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512 bits =64 bytes. 64×(1+8+1+1)=704 bits 512 \text { bits } = 64 \text { bytes. } 64 \times ( 1 + 8 + 1 + 1 ) = 704 \text { bits }

Using 128-bit addresses provides approximately 10x10 ^ { x } unique address, where x= _______.

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2128=28(210)12=256(103)12=256×1036=2.56×10382 ^ { 128 } = 2 ^ { 8 } \left( 2 ^ { 10 } \right) ^ { 12 } = 256 \left( 10 ^ { 3 } \right) ^ { 12 } = 256 \times 10 ^ { 36 } = 2.56 \times 10 ^ { 38 }

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