ITPEC FE Morning April 2022 Question 32
ITPEC FE Morning April 2022 — Question 32 of 80
Line Utilization Rate — calculate bandwidth usage of a leased line.
Given:
- Form size: 2,000 bytes
- Header: 400 bytes per 2 forms → 200 bytes per form
- Volume: 100,000 forms/hour
- Line speed: 1 Mbit/s
Step 1 — data per form:
- 2,000 + 200 = 2,200 bytes/form
Step 2 — total throughput:
- 100,000 × 2,200 = 220,000,000 bytes/hour
- Convert to bits/sec: 220,000,000 × 8 / 3,600 ≈ 488,889 bps
Step 3 — utilization:
- 488,889 / 1,000,000 × 100% ≈ 49%
Answer: (c) 49
Why not others:
- (a) 6.1 — divides by 8 instead of multiplying (bytes→bits error)
- (b) 44 — miscalculates the header allocation
- (d) 53 — adds full 400-byte header to every form instead of every two
Key rule: When headers are shared across N items, divide header size by N per item. Always convert bytes → bits (×8) for bandwidth calculations.
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