(7) dns operation - SOI-Asia

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Assignment 2: DNS lookup overhead Try the following steps A. select a host name for testing B. set up a caching server without any cache (or go to step D depending on your env.) C. ask the server for the selected name. record the round trip time (note that dig prints RTT). D. emulate process C with "dig +trace" and compare the two results. if there is a significant difference, how would you explain that? E. repeat B-D and compare the results. what is the most significant factor on overall RTT (if any)? F. ask again the caching server for the same name before the cache expires and compare all the results. how effective is DNS caching?
Assignment 3 Provide feedback on today’s lecture comments questions requests on workshop
Page 1 and 2: Internet Operation (7) DNS Operatio
Page 3 and 4: Overview of this lecture Prerequisi
Page 5 and 6: A brief review of DNS (1/2) DNS (Do
Page 7 and 8: A brief review of DNS (2/2) Server-
Page 9 and 10: Resource Records (RRs) Entity of DN
Page 11 and 12: Major resource records (2/2) PTR (P
Page 13 and 14: Important SOA Parameters (1/2) e.g
Page 15 and 16: Notes on CNAME (1/2) Another major
Page 17 and 18: Sample of complete zone file "jinme
Page 19 and 20: IPv6 transport for DNS Use IPv6 to
Page 21 and 22: Introduction to DNS operation with
Page 23 and 24: Useful tools for DNS operation with
Page 25 and 26: Output example of dig ; DiG 9.4.0a
Page 27 and 28: DNS operational considerations Lame
Page 29 and 30: Detect lame delegation with dig 1.
Page 31 and 32: Number/location of nameservers How
Page 33 and 34: BIND configurations for separation
Page 35 and 36: Advanced topics Load-balanced opera
Page 37: Assignment 1: check on your ccTLD C

(7) dns operation - SOI-Asia

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