network devices

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12 Terms

1
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wireless access point

  • link between wireless and wired networks

  • creates a wireless LAN that allows devices with WiFi to connect to a wired network

  • separate device or built into a device

2
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router

  • transfer data packets between networks

  • recieve packets and use the IP address (in header) to find the best route

  • data transferred from router to router

  • stores IP address of each computer connected to it

  • uses routing table (a list) to calculate quickest/shortest route

3
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switch

  • connects devices together on LAN

  • recieves data packets from a node, reads the destination address in packet header, forwards data directly to destination

  • generate a list of MAC addresses of all connected devices when it recieves data

4
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Network Interface Controller/Card

  • required for comuter to connect to network

  • MAC address which is used for sending data across a LAN

  • ethernet cable plugged into network card to exchange data

  • used to be a separate card but is now embedded on the motherboard

5
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transmission media

  • communication channel

  • ethernet cables - used by a LAN to transfer data between nodes/switches (Cat5e and Cat6)

  • Fibre optic cables - fast, expensive, fragile, used for WANs, data as pulses of light

  • coaxial cables: older, slower, copper cables. Affected by electromagnetic interference.

6
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internet

  • global network of interconnected networks

  • world wide web isnt the internet, its a way of information access, using HTTPS protocols to view web pages

  • website hosted (stored) on a web server to be accessed by others

  • unique domain name registered with a domain registrar (company that checks name is valid and unused)

7
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internet - servers

  • provide services

  • e.g. web server reponds to web broswer (client) request. Server processes request

8
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DNS servers

  • Domain Name System server stores list of domain names and their IP address

9
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every web page has:

  • domain name (easy for humans to type)

  • IP address (unique address for device the web page is stored on)

10
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to display a web page

  1. domain name typed into address bar

  2. query sent to local DNS server for IP address

  3. if IP address found, DNS sends it to browser

    • if not found, query passed onto DNS server at a higher level.

    • When found, the address is passed back down lower levels to your local server

  4. browser conneccts to IP address of server and can access website

11
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cloud storage: overview

  • networks of servers accessed on internet

  • cloud computing: remote service provision

  • data stored on the cloud is stored in big servers owned by hosting company (e.g. google), so data accessible on internet

12
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cloud storage: pros and cons

  • convenient, people can access at the same time from different devices

  • high capacity, free (can be upgraded w/ subscription).

  • if internet connection fails/servers attacked you can’t access data

  • speed depends on connection