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IB compsci chapter 3 > Network types, hardware, architecture > Flashcards

Network types, hardware, architecture Flashcards

1
Q

what is a computer network

A

comprised of two or more computer systems that are connected and can communicate and exchange data

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2
Q

what are the two roles that a computer can play in a network

A

client
server

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3
Q

what is a client

A

computer system or a software application that requests a service from a server connected to the same network

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4
Q

what is a server

A

computer system or a software application that provides a service to other computers connected to the same network

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5
Q

what are the 3 most commonly used network hardware components

A

hub
switch
router

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6
Q

what is a hub

A

connection point for devices on a single network that consists of a multiple ports

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7
Q

how do network devices connect to a hub

A

using an ethernet cable that attach to a port of the hub

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8
Q

how does the hub work

A

when a network device wants to send a data to another device, it sends the data to the hub
the hub copies the data and sends it to all the devices connected to its ports
the device waiting to receive it accepts it whilst all the other devices ignore it

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9
Q

disadv of hub

A

slows down network
creates a lot of traffic on the network

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10
Q

what is a switch

A

connection hub for devices on a single network

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11
Q

how does a switch work

A

unlike a hub, it can identify the network device connected to each port - transmits data to the exact port where the network device it intends to send it to is connected

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12
Q

adv of switch

A

network is faster than a hub

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13
Q

what is a router

A

joins multiple networks and serves as an intermediary between these networks

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14
Q

what is LAN

A

computer network which connects computer systems within a limited geographical area (eg. office / school)

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15
Q

adv of LAN

A

high data-transfer speed
allow sharing of peripheral devices (eg. printer) - don’t need to buy certain peripheral devices for each computer

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16
Q

technology used to build LANs

A

ethernet cables, hub, switch

17
Q

adv WLAN (wireless local area network)

A

easy to connect - wireless

18
Q

disadv of WLAN

A

less secure than LANs because its wireless

19
Q

what is VLAN (virtual local area network)

A

when each department has its own isolated network that cannot be accessed from the outside - the switch from every LAN is connected to the central switch so they can still communicate

20
Q

adv of VLAN

A

safe
better performance than LAN
more flexible

21
Q

what is WAN

A

computer network that connects computer systems in a larger geographical area (eg. internet)
usually consists of LANs connected together over a broad geographical area

22
Q

what is PAN

A

network that connects devices centered around an individual’s workspace - only supports one person

23
Q

how to devices on PAN connect

A

wired through USB
wirelessly through bluetooth

24
Q

what is storage area network SAN

A

network created so that large storage devices can be accessible from servers conveniently
network that connects servers to storage devices so that they have enough storage space to complete their tasks

25
Q

what is intranet

A

collection of private computer networks that utilizes standard network protocols (eg. TCP/IP)

26
Q

what is the purpose of an intranet

A

facilitate communication between individuals - improve data sharing

27
Q

why is intranet safe

A

resources, services are not available to people outside the company

28
Q

what is an extranet

A

computer network that utilizes the internet to allow controlled access to specific individuals outside the company working on a LAN or WAN

29
Q

what is the internet

A

global WAN connecting millions of computer systems

30
Q

how do users gain access to the internet

A

goes through an internet service provider (ISP) that provides access to the internet

31
Q

what are internet of things

A

network of individual systems that are able to connect to the internet - they all carry necessary software, hardware, are assigned to an IP address

32
Q

what is peer 2 peer network

A

uses distributed network architecture
all the computer systems (nodes/peer) in the network are decentralized
they are both clients and servers at the same time

33
Q

what is VPN

A

computer network that connects two or more computer systems that allows clients from remote locations to connect to the network and appear to be inside the LAN

IB compsci chapter 3 (6 decks)

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