What is a web server?
A computer that stores web pages and delivers them to users when requested
What does every web server have?
An IP address
Why are domain names used instead of IP addresses?
Because they are easier for humans to remember
What is the Domain Name System (DNS)?
A system that matches domain names to IP addresses
What does DNS allow web browsers to do?
Locate, request and access web pages
What happens when a domain name is typed into a browser?
A request is sent to a DNS server to find the matching IP address
What is the first DNS server contacted called?
The local DNS server
What does a DNS server store?
A list of domain names and their corresponding IP addresses
What happens if the local DNS server has the IP address?
It sends the IP address back to the browser
What does the browser do after receiving the IP address?
It connects to the web server to access the web page
What happens if the local DNS server does not have the IP address?
The request is passed to higher-level DNS servers
What is meant by the hierarchy of DNS servers?
DNS servers are arranged in levels, passing requests up and down
What happens when a higher-level DNS server finds the IP address?
It sends it back down to the local server and then to the browser
What happens if no DNS server can find the IP address?
A DNS error occurs
What is the role of DNS in simple terms?
It translates domain names into IP addresses
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Computer Systems + CPU 1.124
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How the CPU works 1.212
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Memory 1.38
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Unit 1 - Lesson 1: Computer Systems and the CPU22
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Types of Networks19
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Peer - Peer + Client - Peer Servers12
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Common Protocols32
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Cloud Storage11
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Units of Data Storage20
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Pixels and Resolution9
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The Internet12
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DNS15
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Network Preformance17
