Year 13 mock
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Loading the website HTML code
client side
Applying CSS styles to a website
client side
Running JavaScript code to check that the customer surname has been entered on the order form.
client side
Running queries on the database to check if an item is available in stock.
server side
what is a protocol and explain why important in network communications
A set of rules for communication/ transmission/transfer of data between devices ● The sending system has no direct control over the way the receiving system responds ● Allows standardisation as different devices have different OS/hardware ● Protocols allow for data to be exchanged in a predictable way/ in the correct format
router
Connect networks together ● Assign IP address to devices ● Examines data packets and forwards them
Cable/ Ethernet
● Carries digital data from one device/NIC to the next ● Connects wired devices to the network
Gateway
● Connects different types of network ● Translates protocols from one network to another
Proxy server
● Sits between user and computer to route requests through an external server ● Creates separation between a user and the site/service ● Protects your security/anonymity by hiding IPs
● Bridge
● Connects different network segments
● Repeater
● Receives a signal and retransmits it
● Network Interface Card / NIC
● Gives each device a MAC address / unique ID ● Allows a computer system to interface with a network
● Wireless Access Point / WAP
● Allows wireless devices to communicate with each other ● Sends and receives radio waves ● Examines data packets and forwards them
Switch e.g.
Switch e.g. ● Connects multiple wired devices to the network ● Receives data and forwards it to the intended recipient Examines data packets and forwards them ● Routes based on MAC addresses
Hub
Hub e.g. ● Receives data from a device and broadcasts it to all devices connected to it
Modem
modulator demodulator ● Changes a signal from digital to analogue
● Firewall
● Firewall e.g. ● Filters traffic coming in and out of a network
powers that this law gives to some government bodies
● Allows for mass surveillance of communications ● Allows the monitoring of an individual’s internet activities/history ● Allows covert surveillance to be carried out ● Can demand access to protected data ● Can demand that ISPs/businesses give access to customer communications (web traffic - packets sent and received) / history ● Can demand that ISPs/businesses install equipment that facilitate surveillance ● Can demand that encryption keys are handed over // force individuals to decrypt data ● Can keep existence of searches and what found private in court
describe what BIOS will do to start up computer
• contains start up instructions • loads settings / config • initialises / checks hardware / peripheral devices are available and functioning as intended • carry out POST check and reports errors • determines drive on which OS is stored • loads bootstrap/OS into RAM
describe how an embedded system can make a different use to ROM other than storing BIOS
• store firmware / config / OS / device drivers that cant be overwritten or doesn’t need to be updated so that access is faster • storing security settings / encryption keys / digital signatures that must be maintained and cant be changed • primary storage so no need to load programs into memory / save time loading up program • secondary storage so device will not need additional storage / reduce size of device
how can a company website get more prescence
• make effective use of metatags that effectively describe contents of website • effective use of H1 tags using suitable headings that describe content of website • increase the num. of quality incoming links from other websites ideally with high pagerank score themselves • increase num. outgoing links a company could potentially work with other companies who have established websites and get incoming links from those sites