Talk:Web Science/Part1: Foundations of the web/Internet vs World Wide Web/Summary of the internet architecture

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Quiz question 4

Qes- Why would not you map 'data' as a link layer apart from application layer?

-As i have understood from the link layer that it interconnect hosts or nodes in the network and a link protocol to only operate between adjacent network nodes of a Local area network segment or a wide area network connection. Now the definition of the link protocol says that ' a Link protocol is a method and specification for transmission of data from one node on a local network or network link to another node on the same link.' Having read that made me really confuse about it. Speaking about segment - it can be also a Network segment (in link layer). And to be completely precise, in IP "datagrams" are used for transmitting blocks of data (rather than packets). --oleamm (discuss • contribs) 10:17, 12 November 2013 (UTC) --Arefin (discuss • contribs) 00:50, 12 November 2013 (UTC)

I'd rather say "data" should be marked in each layer, because all that layers was invented to transfer data from one computer to another computer. --oleamm (discuss • contribs) 10:17, 12 November 2013 (UTC)

I totally agree with you. In addition, the term 'packet' has been used in the sliding window protocol (-> TCP) video of this course. Because of that, I don't accept that it mustn't be associated to TCP in the quiz from an evaluating point of view. The corresponding Wikipedia article states: *A sliding window protocol is a feature of packet-based data transmission protocols.* Thus I consider the quiz to be wrong in this case. --188.109.212.141 (discuss) 21:35, 17 February 2017 (UTC)

URI VS URL

Is a URL a subset of a URI? What is the difference among them? --Aakash.Unlimited (discuss • contribs) 14:44, 13 November 2014 (UTC)

UDP does not provide reliability

In the video one of the transport layer's objectives is said to be reliability. UDP is a protocol of that layer, but it does not provide reliability as segments can get lost. Is there another definition of reliability that I am not aware of? --PeterHeuz (discuss • contribs) 10:21, 7 November 2017 (UTC)

@PeterHeuz: Your understanding of UDP is correct. Not all transport layer protocols provide reliability. Reliability is a performance trade-off. If you want performance, use UDP. If you want reliability, use TCP. Note that applications using UDP must provide their own reliability by either retransmitting or ignoring lost datagrams. -- Dave Braunschweig (discuss • contribs) 18:40, 12 November 2017 (UTC)