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Computer Science > networks > Flashcards

networks Flashcards

1
Q

network

A

a collection of computers/nodes linked together to facilitate communication and the sharing or resources

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2
Q

LAN

A

local area network

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3
Q

PAN

A

personal area network

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4
Q

WAN

A

wide area network

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5
Q

NIC

A

network interface card

piece of hardware inside a device allowing it to connect to networks

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6
Q

switches

A

connect devices on a LAN

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7
Q

routers

A

transmit data between different networks

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8
Q

choice of cable depends on what three main factors

A

cost
bandwidth
how far you want the data to be transmitted

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9
Q

WLAN

A

wireless local area network (local wireless network)

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10
Q

WAP

A

wireless access point

needed to set up a wireless network

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11
Q

topology

A

the layout of a network

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12
Q

give three examples of network topologies

A

star
bus
mesh

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13
Q

star topology

A

all devices are connected to a central switch or server

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14
Q

bus topology

A

all devices are connected by a single cable

two terminators at the ends stop data from reflecting backwards (without them there could be interference)

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15
Q

network protocol

A

a set of rules for how devices communicate and how data is transmitted through a network

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16
Q

layer

A

a group of protocols which have similar functions

17
Q

what are the 4 layers of the TCP/IP model

A

layer 4 - application layer
layer 3 - transport layer
layer 2 - internet layer
layer 1 - link layer

18
Q

processes within the application layer

A

providing networking services to applications

eg turning data into websites

19
Q

processes within the transport layer

A

setting up communications between two devices
splitting data into packets
checking packets are sent and delivered correctly

20
Q

processes within the internet layer

A

adding IP addresses to data packets
directing data packets between devices
handling traffic

21
Q

processes within the link layer

A

passing data over the physical network

responsible for how data is being sent as electrical signals over cables, wireless and other hardware

22
Q

give three examples of protocols in the application layer

A

HTTP
FTP
SMTP

23
Q

give two examples of protocols in the transport layer

A

TCP

UDP

24
Q

give an example of a protocol in the internet layer

A

IP

25
Q

give two examples of protocols in the link layer

A

Wi-Fi

Ethernet

26
Q

ethernet

A

defines how data should be transmitted in a wired network
directs and sends data frames to a device using its MAC address
(ETHERNET IS A FAMILY OF RELATED PROTOCOLS AND NOT A SINGLE PROTOCOL)

27
Q

Wi-Fi

A

allows users to connect device using its MAC address
defines how data is transmitted using radio waves
(WIFI IS A FAMILY OF RELATED PROTOCOLS AND NOT A SINGLE PROTOCOL)

28
Q

TCP

A

transmission control protocol

splits data from applications into small pieces called packets, each of which has a header and a payload

29
Q

UDP

A

user datagram protocol
performs same functions as TCP (splits data from applications into packets) but doesn’t confirm a packet’s arrival or that a packet’s data is correct

30
Q

IP

A

internet protocol
defines how packets should be sent between networks
IP address is added to each packet giving the source and destination IP address, allowing routers to deliver data to the correct destination

31
Q

HTTP

A

hypertext transfer protocol

defines how data should be transferred between web browsers and web servers

32
Q

HTTPS

A

HTTP secure

more secure version of HTTP but with SSL (secure socket layer) encryption for data sent between client and server

33
Q

FTP

A

file transfer protocol
defines how binary and text data can be requested from a server and transmitted back to the client
used to download or transfer files over the network

34
Q

give two email protocols

A

IMAP

SMTP

35
Q

IMAP

A

internet message access protocol
protocol for retrieving emails from a mail server
allows emails to be kept in sync by syncing actions with the server so inboxes are consistent across devices

36
Q

SMTP

A

simple mail transfer protocol

defines how email message are sent from email client to the mail server

37
Q

what are 4 methods of network security

A

authentication
encryption
firewall
MAC address filtering

Computer Science (2 decks)

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