Networking
Top 3
3 Delay Facts Exams Love
The 3 delay facts that keep showing up on networking exams
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Lesson notes
Key points
- Processing delay: Number three: processing delay is the router checking headers and errors, usually microseconds and often ignored.
- Queuing delay varies: Number two: queuing delay changes with traffic, which is why the same route can feel slow at peak hours.
- Transmission ≠ propagation: Number one: transmission is packet length over bandwidth, propagation is distance over speed; students swap them constantly.
Takeaway: Transmission is L ÷ R; propagation is distance ÷ speed.
Quick check: Which delay is calculated as link distance divided by signal speed?
- Transmission delay
- Propagation delay
- Queuing delay
Propagation delay is d ÷ s; transmission delay is L ÷ R.
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