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Networks quick check

A quick check of 3 questions. After you submit, each question shows the right answer and why.

3 of 9 questions, Advanced level. Aimed at the Advanced level, your current depth. Questions you have not answered yet come first.

Show all 9 questions

ScientistQuestion 1 of 3

Suppose each kilometre of optical fibre keeps 95% of the light that enters it. What percentage of the light remains after 2 km? Give your answer to one decimal place.

ScientistQuestion 2 of 3

Which device connects separate networks and forwards packets between them?

AdvancedQuestion 3 of 3

A laptop already speaks IP. Why does it also need a link-layer protocol such as Ethernet or IEEE 802.11?