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Given data bits 1011001 and even parity, what is the parity bit value?

medium📝 Analysis Q4 of 15
Computer Networks - Physical and Data Link Layer
Given data bits 1011001 and even parity, what is the parity bit value?
A1
B0
CCannot determine
DParity bit not needed
Step-by-Step Solution
Solution:
  1. Step 1: Count number of 1s in data

    Data bits are 1 0 1 1 0 0 1; count 1s: 1+0+1+1+0+0+1 = 4 ones.
  2. Step 2: Determine parity bit for even parity

    Since 4 is already even, parity bit must be 0 to keep even parity.
  3. Final Answer:

    0 -> Option B
  4. Quick Check:

    Even parity bit = 0 if 1s count even [OK]
Quick Trick: Parity bit makes total 1s even or odd [OK]
Common Mistakes:
MISTAKES
  • Miscounting number of 1s
  • Choosing parity bit opposite to needed
  • Ignoring parity bit when data already even

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