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DNS and TCP Sequence Numbers (Again!)

DNS and TCP Sequence Numbers (Again!). EE122 Discussion 10/24/2011. DNS Record Types. DNS deals in terms of “ resource records ” Type A : <hostname, IP> Type NS : <domain, hostname of auth. server> Type CNAME : <canonical name, alias> TYPE MX : <name, mail-server>. DNS Packet Format.

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DNS and TCP Sequence Numbers (Again!)

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  1. DNS and TCP Sequence Numbers(Again!) EE122 Discussion 10/24/2011

  2. DNS Record Types • DNS deals in terms of “resource records” • Type A : <hostname, IP> • Type NS : <domain, hostname of auth. server> • Type CNAME : <canonical name, alias> • TYPE MX : <name, mail-server>

  3. DNS Packet Format

  4. Q2 – Default Server to root

  5. Q2 – Root server’s reply Glue Records

  6. Q2 – Default Server to .com TLD

  7. Q2 – .com TLD to default server

  8. Q2 – Default server to Auth. Server

  9. Q2 – Auth. Server to Default server

  10. TCP Sequence Numbers • Initial sequence number for the connection is not zero • Sequence number refers to the first byte in the TCP packet payload

  11. Question 3 • 10001 • 15000 • 1501 • 1501 – 1550

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