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All 9 questions. After you submit, each question shows the right answer and why. Back to the quick check
Which kind of network lets a laptop join without plugging in a cable?
Routers pass data along as separate small packets, handling each packet on its own.
In the Internet's layered design, which layer sits at the top, closest to the programs you use?
Where did the word 'packet', used for the small chunks of data sent over networks, come from?
A hardware network address (EUI-48, often called a MAC address) is 48 bits long. How many bytes is that? (1 byte = 8 bits)
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.
Which device connects separate networks and forwards packets between them?
A laptop already speaks IP. Why does it also need a link-layer protocol such as Ethernet or IEEE 802.11?
RFC 1122 says gateways keep no connection state and reliability lives in the hosts. Explain one robustness benefit of this end-to-end design and one consequence for applications.
