I was looking for Networking comprehensive exams…and I got to a sample from Stanford University…Under the Transport Protocol Design section…I found this question:
Imagine that Osama Bin Laden (OBL) has gained control of the backbone Internet routers, but the Mullahs have ordered (for some curious reason) that he is limited to just being able to drop up to K percent of the packets, but can decide which ones to drop, at least based on L3/L4 properties. (The fatwa says he is not allowed to drop more or inject or modify traffic, thank you, Mullahs!) Describe your analysis of what OBL’s best strategies are for interfering with Internet usage and the minimum values of K required to do so.
Check the whole exam…there’s another one talking about Albert Einstein’s ghost …
4 Comments
Interesting question and I don’t have the answer :). But I think u mixed up the Networks exam with Software Systems exam, here’s the correct one
I think the best kind of traffic to drop is the TCP-ACK ones.
Server/Hosts will keep on sending the same packets again and again, which will to result in:
1- Mora traffic sent – causing network congestions
2- More traffic sent = more ACKs to drop without increasing the K%.
For each packet there is one ACK, so I think the optimum K is 50%
hehehehe…thanks ikhnaton2…I was getting exams for many courses actually and I got the wrong link here :$…thanks alot for pointing it out…the link is fixed now…
and Tarek…shokran..I got it almost right 😀
Hmmmmmmmmmmmm, ok; set aside all your confusing computerific terms 😀 what happened to OBL ?:D Lost in cyberspace with a couple of packets ?:D