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Computer Science Gcse Aqa > 3.5 Computer Networks > Flashcards

3.5 Computer Networks Flashcards

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1
Q

What is a computer network?

A

Two or more computers connected together

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2
Q

Advantages of computer netoworks 4x

A
  • share files
  • share internet connection and hardware devices
  • improved communication
  • roaming profile
  • central backup
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3
Q

Disadvantages of computer networks 4x

A
  • reliance on networked sources
  • expensive hardware
  • risk of spread of viruses
  • specialist staff often required (maintenance & installation)
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4
Q

What is PAN + examples

A

Personal Area Network
Connect electronic devices within a user’s immediate area
Wired or wireless
Mouse, keyboard, printer, headphones

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5
Q

LAN

A

Local Area Network
Network contained within one building or site

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6
Q

WAN

A

Wide Area Network
Computer network that extends over a large geographical area, connecting LANs

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7
Q

LAN topologies

A

Star & bus

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8
Q

Router

A

A network device that forwards data packets between computer networks

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9
Q

Gateway

A

A device used to connect two different networks, especially a connection to the internet

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10
Q

Internet

A

A global computer network of interconnected networks using standard communication protocols

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11
Q

Broadband

A

A high speed internet connection

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12
Q

Firewall

A

A network security system designed to prevent unauthorised access to or from a private network

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13
Q

Define network protocol

A

A set of rules that allow devices and computer networks to communicate securely and transfer data reliably

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14
Q

Ethernet network protocol

A

Data transmitted via wired LAN

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15
Q

Copper cable vs fibre optic cable

A

F.O is faster using protons rather than electrons
Plus not a fire hazard

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16
Q

Wi-Fi

A

=group of wireless network protocols
Using radio signals

17
Q

WAP

A

Wireless access point
Enables mobile devices to have wireless access to wired network

18
Q

TCP/UDP/IP

A

IP is an identifier of data
TCP/IP tgt to connect devices
UDP/IP tgt to route and transport data

19
Q

TCP VS UDP

A

TCP connect devices and labels packets
UDP sends packets

20
Q

FTP

A

file transfer protocol
Legacy communication to transfer files to another computer

21
Q

Email protocols

A

Both transfer electronic messages
SMTP: from client to servers or between servers
IMAP: only from an email server to client

22
Q

4 layer TCP/IP model

A

Application
Transport
Internet
Link

23
Q

differences between LAN and WAN

A
  • LAN links only in one site
  • speed of LAN transmission is higher than WAN with traffic
  • WAN are typically public networks, LANs private, hence no need encryption
24
Q

define network protocol

A

a set of rules that allow computer networks to communicate securely and transfer data reliably

25
Q

what protocols are in application layer?

A

http https
smtp imap

26
Q

what protocols are in transport layer?

A

tcp udp

27
Q

what protocols are in the internet layer?

A

ip

28
Q

what protocols are in link layer?

A

ethernet, WiFi

29
Q

network security measures

A

authentication
encryption
firewalls
mac address filtering

30
Q

advantages of using wireless networks as opposed to wired networks

A

-lower setup costs
-no wires/cables required
-easy to connect new devices
-can connect multiple devices without need for extra hardware

31
Q

advantages of using wired networks as opposed to wireless networks

A

-connection speeds usually faster
-typically have higher bandwidth
-fewer security risks

32
Q

disadvantages of using wireless networks as opposed to wired networks

A

-slower connection
-connection not as stable
-more security risks

33
Q

disadvantages of using wired networks as opposed to wired networks

A

-cables are hazardous and unaesthetic
-expensive to set up
-not all devices can connect via cables eg tablets

34
Q

how does authentication work?

A

takes one or more data specific to user
and compare to stored credentials to compare if valid

35
Q

how does mac address filtering work?

A

takes unique MAC address for a device, and check if its in the whitelist and allow connection to network

36
Q

advantages of using a star topology instead of bus

A
  • better security
  • a faulty connection only disables one computer
37
Q

why is HTTPS often used rather than HTTP?

A

S is secure
can only be read by intended recipient

38
Q

what is encryption?

A

changing data so they cannot be read (except for those with decryption key)
to prevent unauthorised people from reading sensitive data

Computer Science Gcse Aqa (5 decks)

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