Chapter 1Network Fundamentals Networking Fundamentals and Media Services (NMS)
Network A system in which a number of computers are linked together to share data and peripherals Resources Hard disks, printers, internet connection, etc
Evolution of Networks Local Area Metropolitan Wide Area Connect 2 Sneakernet Network Area Network Network computers (LAN) (MAN) (WAN)• Hand carry thumb • Computers • Computers • Computers drive / disk interconnected interconnected interconnected within a building within several around the world buildings
Why network? Share information or data Share hardware or software Sharing information or data Increase security • Documents • Videos & audio files Backup files • Calendar schedule • Social media Share internet connection Play multiplayer games
Network security Logging out if you will be away from your workstation for more than 15 minutes Using unusual passwords (containing letters, number and special characters) and changing them regularly Using deceptive filenames for sensitive data Conducting audit trial to track network activities
Intranet vs InternetIntranet Network to make information available to employees on the company’s internal networkInternet World-wide network of computers accessible to anyone who knows their Internet Protocol (IP) address - the IP address is a unique set of numbers (such as 22.214.171.124) that defines the computers location.
Backup A file server is a computer responsible for the storage and management of data in a central location.
Components of LAN Computers Hosts Peripherals (Shared Resources) Network Interface Card (NIC) Networking media –> how the hosts communicate Network traffic control or Network Communication devices
Network Interface Card (NIC) A printed circuit board (PCB) that fits into the expansion slot or integrated into the mother board Also called network adapter Adapt the host device to the network medium Unique Media Access Control (MAC) address
Networking Media Copper cable Pairs with different twist rates to reduce crosstalk RJ45 (Registered Jack )
Network traffic control or NetworkCommunication devices Repeater – amplifies the electrical signals and resends the data, single port “in” and single port “out” Hub – may be 4, 8, 12, 16 or 24 ports Passive: just split the signal for multiple hosts Active: multi-port repeater, extend a cable length Bridge – filter traffic between two LAN segment using MAC address Switch – multi-port bridge Difference between Hub and Switch? Router – direct traffic from one network to another (path selection and switching of packets) using IP address