DNS: Domain Name Service
- Directory Service for Internet resources
- Resources?
- IP addresses
- Host Info
- Canonical names of Host
- Simplified names (aliases) Host
- Names of mail servers
- Other
- Resources?
- What is a Domain Name?
- Initial specifications in RFC 1034 and 1035
- Method of identifying resources on the Internet, for persons
- Symbolic name easy to remember
- Chain of "tags”
- They can identify:
- a host. E.g. Host "cisneros" cisneros.aut.uah.es
- an organisation. E.g. for the Department of Automation: automatica.aut.alcala.es
- a service. E.g. UAH Web: www.uah.es
- Initial specifications in RFC 1034 and 1035
What are the functional entities of DNS?
- The DNS system is based on a model of the type:
- Client-Server, and Distributed (not centralized)
- Transport Service used
- Normally UDP port 53 by default
- It could also be TCP, port 53
- Functional Entities
- DNS clients (resolvers)
- Typically located in Hosts
- Serve certain Network Applications
- DNS servers
- As applicable, may act:
- Just as Servers, or mixed, as a client and server → Proxy
- As applicable, may act:
- DNS clients (resolvers)
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Project
Contact
This resource was developed as part of an Erasmus+ project, funded with support from the European Commission under grant agreement 2016-1-SE01-KA203-22064.
The project was a collaboration between:
- The University of Borås, Sweden
- The University of the Highlands and Islands, Scotland
- The University of Alcalá, Spain
- Digital Connections, Scotland
This resource has been released under Creative Commons license CC-BY-SA 4.0.
Disclaimer
If you would like more information on this resource please contact:
- Academic content – The University of Alcalá (https://www.uah.es/en/)
- Technical resource development – The University of the Highlands and Islands Educational Development Unit - EDU (edu@uhi.ac.uk)
Except where otherwise noted, this website is licensed under Creative Commons license CC-BY-SA 4.0. All images used under permission remain the copyright of the license holder.
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