General Revision Questions Flashcards
what are the advantages of using copper cable (ethernet)
cheaper than fibre optic
faster than WiFi
more secure than WiFi
what does TCP do?
the protocol that allows two or more computers to communicate
what is meant by coding?
shortening instructions
how does lossless compression work?
dictionary encoding, run length encoding. shortens the file size without losing any information
what is encryption?
scrambles/disguises data so it is unreadable without a key
what is memory?
primary storage contains current programs and os
the PC is incremented by an amount goverened by the CU true or false
in GCSE it just increments by 1 even though its controlled by the CU
what protocol is used to transfer big files such as websites between computers?
File Transfer Protocol
which piece of legislation governs the unauthorised usage of data?
Computer Misuse Act
what is a brute force attack?
trying every possible combination
run length encoding is…
[you need to get a better description but its the one where you say if theres 5 blue pixels in a row you write it as 5xblue or whatever]
what does CD ROM stand for
compact disk read only memory
“We use hard drives because they are cheap” true or false?
false, they are cheap per GB
what is a protocol?
a rule for transmitting data
what types of media can data be transmitted?
fiberoptic, copper, Wi-Fi
hex colour for red?
ff0000
dictionary encoding is a form of…
lossless compression
what is the purpose of a mac address?
to uniquely identify hardware connecting to a network
what is a pixel?
the smallest element of an image
what is a ddos attack?
an attempt to make an online service unavailable by overwhelming it with data
what is the denary ascii number for a lowercase a?
97
what is the denary ascii number for an uppercase a?
65
What is an NIC?
Network Interface Card
A computer must have what device to connect to a network
NIC (Network Interface Card)
What are the disadvantages of fibre optic?
expensieve, needs specialist equipment and workers to install
A condition or iteration statement in programming such as IF or WHILE could change the address in which register first?
PC
Why does having a very large cache not give a big performance increase for the CPU?
It will take more time to find the data in a large cache
client server
client requests data/connections from server
server controls access+ security to a shared file store
Or managing access to other services, e.g. internet, printers, email, backup
Define the term: POP (Post Office Protocol)
used by email client software to retrieve email from a mail server
