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Understanding DNS: Functions, Structure, and Exam Preparation

This lecture focuses on the Domain Name System (DNS), covering its main functions such as finding URLs, IP addresses, and host names. It includes details on zone transfers, the significance of name servers, and the requirements for DNS zones, including the roles of primary and secondary name servers. Important homework assignments, mid-term labs, and upcoming projects are also discussed. The exam format consists of true/false, multiple-choice, fill-in-the-blank, short answers, and an essay. Students are encouraged to prepare by reviewing today's lecture materials and homework.

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Understanding DNS: Functions, Structure, and Exam Preparation

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Presentation Transcript

  1. ITIS 2110 Class #12 February 19, 2014

  2. What is DNS main function: • Finding URLs • Finding the IP address for a host on a network • Finding the host name for an IP address • Zone transfers 29

  3. To Do • HW • Mid-term

  4. Labs • Next week: • Lab 6 Team Project • Must be there for credit

  5. HW • HW 4 is due March 10

  6. Mid-term • Cover through today’s lecture material • Will cover all the DNS material • Might not include HTTP material • 100 pts • Format • 5 - 15 T/F worth 1 pt each • 5 - 15 Multiple choice worth 1 pt each • 5 - 15 Fill in the Blank worth 1-2 pts each • 2 - 10 Short Answer worth 2-4 pts each • 1 Essay worth 10-20 pts • Exams.htm

  7. Essay question: • Opening paragraph • Ask question to be answered • State a thesis to be substantiated • Support paragraph(s) • 1 or more paragraphs supporting your opening paragraph • Closing paragraph • Restate what you have just argued

  8. DNS recap/further notes • A domain contains one or more zones • Each zone requires at least 2 DNS servers • Due to the importance of name servers • Not because needed to logically work • 1 name server is the primary • 1 or more are secondary • The primary and secondary name servers are authoritative • A zone may contain sub zones • A name server can serve more than one zone • For example, it can be the primary server for one zone and a secondary server for another zone • Name servers should be on separate machines • Preferably in separate areas/networks

  9. Lecture • DNS • DNS Records • Resume slide 24 • HTTP • HTTP

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