HW3 solution_E2

HW3 solution_E2 - 1 (a)Not necessarily. Sometimes one DNS...

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1 (a)Not necessarily. Sometimes one DNS can map to several IP address. (b)A canonical name. (c)To find the 13 root DNS servers’s IP address, we could use the command: nslookup -type=ns . 2 (a)www.umass.edu: 23+23+23+21+13+1+19+19+5+4+21(modulo 3)=1; www.eurecom.fr: 23+23+23+5+21+18+5+3+15+13+6+18(modulo 3)=2 www.upenn.edu: 23+23+23+21+16+5+14+14+5+4+21(modulo 3)=1 www.wimba.com: 23+23+23+23+9+13+2+1+3+15+13(modulo 3)=1 www.w3c.org: 23+23+23+23+3+15+18+7(modulo 3)=0 www.ietf.org: 23+23+23+9+5+20+6+15+18+7(modulo 3)=2 www.awl.com: 23+23+23+1+23+12+3+15+13(modulo 3)=1
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(b)The morning request will be satisfied by the origin servers. The afternoon requests will be satisfied by the cache servers. (c)Since Modulo-4 algorithm instead of Modulo-3 algorithm is used, some of the requests will be directed to caches server where no prior cache exists. So it would be hit miss so even if cached content exists on the server some of them could not be satisfied and has to be fetched from the original server. 3
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HW3 solution_E2 - 1 (a)Not necessarily. Sometimes one DNS...

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