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dan.smaje Inglês 3 flashcards

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1How is a DNS server used to access a website and what are the advantages?DNS servers have a database of IP addresses.
They are constantly updated by other DNS servers
When you request an address the DNS server looks up the URL and returns the IP
People dont need to remember IP addresses
Easily upgradeable without all web addresses needing to be the same
As long as you are connected to a DNS server you have access to all addresses
2Why do computers use binary? How are instructions stored in binary?So that they can be based on logic circuits
each part of the circuit can be in one of two states
0 and 1 are true and false
Instruction consists of an operator code and an operand
Both stored as bit patterns
Each op code has a unique bit pattern
3What two ways can modern computer technology help monitor pupils?Swipe cards can allow pupils to register themselves
Electronic registers can send messages to inform of absence