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Understanding DNS Record Types and TCP Sequence Numbers in Networking

This discussion focuses on the fundamental concepts of DNS (Domain Name System) record types and TCP (Transmission Control Protocol) sequence numbers. It explores various DNS record types such as A, NS, CNAME, and MX, highlighting their roles in resource records and domain resolution. Additionally, we delve into the importance of TCP sequence numbers, emphasizing that the initial sequence number for a connection is never zero and how it represents the first byte in the TCP packet payload. Join us for a comprehensive overview of these critical networking topics.

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Understanding DNS Record Types and TCP Sequence Numbers in Networking

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Presentation Transcript

  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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