Networking
10 seconds
TTL Challenge: How Many Routers Can It Cross?
Ten seconds. Go. Can you beat the TTL countdown?
Quick check · tap an answer to continue
Lesson notes
Key points
- Each router decreases the TTL by exactly one before forwarding.
- 64 minus 10 routers gives a TTL of 54 at the destination.
Takeaway: Every router subtracts one from TTL; zero means the packet dies.
Quick check: A packet leaves with TTL 64 and passes 10 routers. What TTL does it arrive with?
- 74
- 54
- 64
Arriving TTL = starting TTL minus routers crossed; at zero, it's dropped.
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