CST2555Resit/Deferral Essay 2022
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CST2555 Resit/DeferralEssay
2022
Computer Networks
(a) What is the difference between routing and forwarding? [2 marks]
(b) Routing algorithms can be either link-state or distance-vector. Define these two
terms and explain the trade-offs between them. [4 marks]
(c) Two network-architecture approaches are commonplace: hop-by-hop, and end- to-end.
Briefly compare these two approaches with reference to the encryption of a web-page and the use of WPA2 (or similar schemes) to secure WiFi. [4 marks]
(d) Consider four components that constitute delay for a packet network: queueing delay, processing delay, propagation delay, and transmission delay.
i) Order these delays by magnitude, giving typical values for each and making clear your justification. [7 marks]
ii) Describe circumstances where processing delay for one packet type varies significantly from the mean processing delay of a packet.
[2 marks]
iii) Estimate what such a difference in delay might be. State your assumptions and show your working. [2 marks]
iv) Packet-network delays of a typical datacentre may vary significantly from those found in the Internet.
Discuss why this should be the case, with particular reference to the Bandwidth-Delay product and discuss the implications for network architectures in datacentres where we wish to minimise delay. [4 marks]
2022-06-22