internet (5)

• internet


  collection of inter connected devices
• network


  2 or more connected devices
• WWW


  world wide web. content viable to internet
• WAN


  wide area network. network over a large geo area
• URL


  uniform resource locator. text based address for a webpage. contains protocol, domains, file-name/web page
• IP


  internet protocol. an address for an internet connected device. IPv4 - very limited. IPv6, more space
• packet switching


  when a file is sent + broken down into data packets. when data is sent the data is all muddled up, once arrived the packets reassemble. not all packets send, it has to be resent
• data packets contain:


  IP address coming from

  IP address going to

  sequence number of packets

  num. of packets in whole communication

  error checking data
• packets


  a segment of data. advantage - you can send file quicker, and all at once
• DNS


  domain name system. allows you to type in web address and translates that into IP address. makes life easier for humans.
• NIC


  network inferface card. need to get into network, wireless or net
• MAC


  media access control. assigned to each NIC by manufacture using hexadecimal
• phishing


  someone using malware communication with the intent of stealing personal information
• brute force attack


  try to access someones account. they use a list of common passwords
• technical weakness can make a computer vulnerable to:


  malware

  DoS attack

  data interpretation and theft
• virus


  malware + installed on someones device
• worms


  malware + spread on its own, its a self replicating virus
• DoS attack


  Denial of service. try to flood website servers with overwhelming amounts of data packets (requests). this either shuts it down or just slows it down. this requires low amount of skill
• cookies


  small text files which store data about your browsing habits
• session cookies


  only lasts while you are on the website. once you close website the cookies are lost. doesn't have a time limit
• persistent cookies


  long term memory. data stays even when tab closed. has a time limit
• digital currency


  only exists online. uses HTTPS, details stored in persistent cookies, goes from one machine to another
• blockchain


  list of records within digital currency (digital ledger). once it is in a block, it can't be edited. anyone who wants to see this data, can
• cryptocurrency


  decentralised, doesn't need to go through a central place (eg. bank), it is untraceable
• firewall


  between the users computer and networks to examine data traffic to make sure it meets certain criteria.
• browser


  software application used to locate, retrieve and display content on web pages and other files.