ITGS Textbook: Chapter 2 (Networks) Summary/Review/Study Guide

  1. What is a packet?
    1. A unit of data which is routed between an origin and a destination on the internet or any other packet-switched network
  2. How is the packet labelled?
    1. It is labeled by assigning a number (label)
  3. What is a LAN?
    1. Local Area Network, a computer network that spans a small area connecting one computer to another.
  4. What is a router and what does it do?
    1. A Router is a small device that sits between a modem and a computer with the function to take the information from the modem and deliver it from the modem to a computer or multiple computers in the network (usually for internet connection).
  5. What is an Intranet?
    1. A local or restricted private network which is personally owned to an individual, to an organization or to a group.
  6. What is a switch and what does it do?
    1. A switch is a device that channels incoming data from multiple input ports to a specific output port and it will take the data to its destination
  7. What is a proxy and what does it do?
    1. A point to point connection between the user and the remote location on the internet. This connection provides a tunnel through which all further communication will pass.
  8. Does a proxy server deal with security?
    1. It deals with security by providing the user anonymity and acts as a VPN (Virtual Private Network)
  9. What is a firewall?
    1. Prevents nasty things fron internet to come in computer
    2. Designed to let in the packets that are supposed to go in, they close in other ports in which dangerous files would go in from.
    3. Ping of death packet tries to disguise itself as a normal packet
  10. What is the bandwidth?
    1. The amount of information that can be transmitted over a network in a given amount of time, usually expressed in bits per second.
  11. What paths can packets take?
    1. Satelite, telephone line (takes fastest and shortest route possible)
    2. Go around the world 5 times in a drop of a hat
    3. Sends a replacement packet
  12. What is a port?
    1. Ports allow software applications to share hardware resources without interfering each other.
  13. What are ports 25 and 80 used for?
    1. Port 25 is used for mail and port 80 is used for the internet

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