Computer Networks: Why the Internet Never Promises Delivery
A tour of how data really crosses the Internet, from light in glass fibers to routing, TCP, DNS and encryption.
Computer Networks · 50 questions
Try 3 questions
1. Why is the seven-layer OSI model mostly taught rather than actually run on today's networks?
- Its design was kept secret
- Its seven layers were too slow
- The TCP/IP suite was adopted first
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Answer: The TCP/IP suite was adopted first
The OSI protocols arrived after TCP/IP had already spread across networks, so OSI survives mainly as a teaching vocabulary.
2. As your message travels down the protocol layers before leaving your computer, what happens to it?
- Each layer encrypts it once more
- Each layer compresses it further
- Each layer wraps it with its own header
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Answer: Each layer wraps it with its own header
This is encapsulation: transport, network and link layers each add a header that their counterpart on the other side reads and removes.
3. At which layer does the Internet Protocol (IP) itself operate?
- The data link layer
- The transport layer
- The network layer
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Answer: The network layer
IP moves packets between networks using global addresses, which is the job of the network layer; TCP and UDP sit above it.
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