Intro to Comp & Apps Lecture 6.docx - Computer Networks...

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Computer Networks A collection of computer equipment that’s connected with wires, optical fibers, or wireless links so that various separate devices (known as nodes ) can “talk” to one another and swap data (computerized information) The various separate devices can communicate with one another and exchange information 2 or more hardware devices connected Data can be shared Wired is better than wireless because of: o Security o Speed o Better signal Benefits of Networks Reduces costs as a result of resource sharing o Sharing hardware / peripherals o Sharing applications o Sharing files between network users o Sharing a single internet connection Disadvantages of networks: Hackers / Security o Reason why networks have firewalls for protection by hiding IP address o DOS – Denial of Service o DDOS – Distributed Denial of Service Viruses Network failure Setup costs Tech support and maintenance Hacker Activities Trojan Horses o Appears useful o Back-door; take over control DOS (Denial of Service) DDOS (Distributed Denial of Service) o Comes from multiple PCs
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o Harder to trace Hackers can access computers: 1. Directly 2. Via logical ports Network Classifications LAN (Local Area Network) o Within a small area such as a building or a campus WAN (Wide Area Network) o Covers a much larger geographic area, such as a state, or a country o Greater the distance of the nodes that are connected to the internet, you get a wider network o The “ Internet ” is the largest area network PAN (Personal Area Network) o Interconnection of your personal digital devices
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