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slideshow 2

  1. 1. Dilasha Shrestha 4 th block ARPANET (Advanced Research Projects Agency Network ) advanced research project agency network developed by ARPA of the United States Department Of Defense during the Cold War, was the world’s first operational packet switching network, and the predecessor of the Global Internet.
  2. 2. Hard & Soft Bounce <ul><li>Hard bounce: the fail of an email due to the permanent reason like a non-existent address </li></ul><ul><li>Soft bounce: email message that gets as far as the recipient’s mail server but is bounced back undelivered b/c the recipient’s inbox is full. </li></ul>
  3. 3. Computer Spam <ul><li>Junk Mail </li></ul><ul><li>Abuse of electronic messaging systems to send unsolicited bulk messages indiscriminately. </li></ul>
  4. 4. Internet & Intranet <ul><li>Intranet: private computer network with a firewall, business </li></ul><ul><li>Internet: an electronic communication network that connects computer networks and organizational computer facilities around the world </li></ul>
  5. 5. POP <ul><li>Post office protocol </li></ul><ul><li>A protocol used to retrieve e-mail from a mail server. </li></ul>
  6. 6. Phishing <ul><li>the act of sending an e-mail to a user falsely claiming to be an established legitimate business in an attempt to scam the user into surrendering private information that will be used for identify theft. </li></ul>
  7. 7. Encryption & Decryption <ul><li>Encryption: scrambling of the info for security purpose. </li></ul><ul><li>Decryption: descrambling of info for security purposes that has been sent across the internet. </li></ul>
  8. 8. Netiquette <ul><li>Guidelines for posting messages to online services, and Internet newsgroups. Netiquette covers only rules to maintain civility in discussions. But also special guidelines unique to the electronic nature forum messages. </li></ul>
  9. 9. Router <ul><li>A device that forwards data packets along networks. A router is connected to at least two networks. Routers are located at gateways, the places where two or more networks connected. </li></ul>