Flashcards
DNS servers and ISPs
Cards in this deck (6)
- 1What is a Domain Name System (DNS)?A distributed database that matches IP addresses to computer system resources.
- 2How does a DNS server allow you to visit websites?When you type in the URL of a website, your computer system sends a request to its DNS server for the IP address that is mapped to that URL.
The DNS server returns the IP address, which allows your computer system to communicate with the computer system where the website is stored. - 3What happens if your local DNS server doesn't store the address of the requested resource?It will pass the request along to another higher level DNS server, e.g. your Internet Server Provider's DNS. If again the address isn't found, your ISPs DNS server will pass the request onto a higher DNS server which may be the server responsible for an entire zone, e.g. .co.uk
- 4What is another example of the use of a DNS server?Where a computer system, upon joining a network, would query the DNS server for the IP addresses of other useful computer systems.
- 5What is an Internet Service Provider (ISP)?An organisation which provides end users with access to the Internet.
- 6Give an advantage of an ISP.It provides and uses an agreed set of protocols and services, such as email.
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- GCSE Computer Science (5. The Internet and Communications) Flashcards on DNS servers and ISPs, created by Zoe CB on 07/04/2016.
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- Zoe CB
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- Created by Zoe CB · Apr 7, 2016
- Copied by Zoe CB · Apr 7, 2016
- Copied by Zoe CB · Apr 7, 2016
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