Shared by 
Unlock all 31 pages
Get it free by sharing your own notes, buy just this one, or become a member and unlock documents with your plan.
How to unlock this document
Choose the way that suits you. Each one gives you all 31 pages to read online and the PDF to download.
Share your notes, unlock for free
2 free unlocks for every 5 approved uploads
- Upload your own lecture notes, assignments, essays or past papers
- PDF, Word, PowerPoint and Excel files all work, and you can send many at once
- We check each upload; you get a notification when it is approved
- Spend a free unlock on this document or any other, and keep it for good
- Shared under your public username, never your email
Then upload your notes from your profile.
Buy this document
$31 one-time payment
- All 31 pages of this document, yours to keep
- Download the PDF and read it any time, also offline
- No subscription and nothing to cancel
- Find it again any time under My Profile → Library
You log in or create a free account first, then pay securely.
Become a member
Unlock documents from the whole library, which keeps growing
- Choose any documents you like, up to your plan’s unlocks
- Documents you unlock stay yours, even if you cancel later
- Your unlocks start again with every renewal
- Secure checkout by Dodo Payments
You log in or create a free account first, then pay securely.
Compare the plansAlready a member, or bought this before? Log in to open it
About this document
- Pages
- 31 pages
- Price
- $31 one-time, yours to keep
- Membership
- Included in every plan
- Format
- Subject
- Computer Science, Information Technology
This document introduces the Domain Name System (DNS). It explains the purpose of naming, the history of DNS, its features, and key concepts. It is useful for understanding how DNS works and its components.
What's inside
- Purpose of naming
- History of DNS
- DNS features
- DNS concepts
- DNS names
- Resource records
Who it is for: For students learning about the Domain Name System. (Undergraduate)
Share with classmates: WhatsApp Telegram X LinkedIn Facebook
Summary
The Domain Name System (DNS) translates names into addresses. It is a globally distributed, reliable, dynamic database. Students learn how DNS works and its key concepts.
Purpose of naming
Addresses are used to locate objects. Names are easier to remember than numbers. DNS provides a mapping from names to resources of several types.
History of DNS
The DNS was created in 1983. It replaced the earlier host.txt system. DNS has been modified and updated by many RFCs since then.
Key concepts of DNS
DNS names are hierarchical. Resource Records map names into data. DNS uses name servers and resolvers to answer queries.
Resource Records
Resource Records consist of name, TTL, class, type and RDATA. The IN class is the most widely used. There are multiple types of Resource Records.
Key terms
- Fully Qualified Domain Name
- A name that specifies its exact location in the DNS hierarchy.
- Resource Records
- Records that map names into data in the DNS.
- Name servers
- Servers that answer DNS questions.
- Resolvers
- Clients that ask questions of the DNS system on behalf of applications.
- Time to Live
- A timer used in caches to indicate how long data may be reused.
- SOA timers
- Timers used for maintaining consistency between primary and secondary servers.
Questions this document helps with
- What is the purpose of DNS?
- How does DNS translate names into addresses?
- What are the key components of DNS?
Summary written with AI from the document's text.
Ask the AI Teacher
Ask any question about this document or your course, and get a clear explanation.
Log in to ask Create a free account
Free accounts can ask 5 questions a day.