Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Computer Science > Chapter 21: Networks > Flashcards

Chapter 21: Networks Flashcards

You may prefer our related Brainscape-certified flashcards:
Biology 101 flashcards
1
Q

Network

A

An arrangement of computers or other electronic devices connected together to enable communication and share resources, data & information.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

LAN

A

Network that covers a small geographical area-often a single site

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

WLAN

A

A LAN in which connected devices use high-frequency radio waves to communicate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

WAN

A

Network that covers a large geographical area-connects together two or more LANs; usually under shared ownerships

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

PAN

A

Network used for data transmission over short distances by computer devices

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Client-server network

A

Network that has at least one server to provide services to the client computers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Peer- To- Peer network

A

Network which doesn’t have dedicated servers-each computer can act as client & server-each computer can provide service and request service

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Network topologies

A

Describes how devices on a network are connected together

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Bus

A

Type of network topology in which each network device is connected to a single cable (bus), terminated at each end

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Terminators

A

Absorb signals that reached the end of the cable; prevent messages bouncing back & causing interference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

CSMA/CD

A

System dealing with multiple messages being sent simultaneously. Two messages sent at same time causes collision & makes messages unreadable.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

CSMA/CD algorithm

A

Checks if bus is busy, if not then sends message & listens whether received correctly. If not, it retries sending message, else it goes back to listening

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Ad. bus (2)

A
  • Easy to add new devices
  • Cheap & easy to install since 1 cable needed only
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Dis. bus (4)

A
  • If cable cut/damaged, whole network fails
  • Difficulty identifying fault
  • The more devices, the slower they run; only one message can be sent at a time, more frequent collisions
  • All devices receive all data; security risk
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Ring

A

Network in which the cable connects one network device to another in a closed loop/ring

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Ring features (2)

A
  • Messages travel in same direction, therefore no collisions
  • Data passed around ring until it reaches its destination
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Ad. ring (3)

A
  • Easy to add new devices
  • Extra devices do not affect network performance
  • No collisions
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Dis. ring (4)

A
  • If cable/network device fails, whole network fails
  • Difficulty identifying fault
  • Adding/removing devices shuts down network temporarily
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Star

A

Network in which each network device is connected to a central hub/switch, which receives & redirects messages to correct recipients

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Ad. star (4)

A
  • Damaged cable only stops device connected to it from working, not whole network
  • More secure; messages only sent to devices needing them if switch used
  • Easy locating faults (1 device involved)
  • Adding/removing devices does not shut down network
21
Q

Dis. star (2)

A
  • If hub/switch fails, whole network fails
  • Expensive to install due to Hub/switch & amount of cable
22
Q

Mesh

A

A network where each network device is interconnected with one another. Can be wired or wireless

23
Q

Ad. mesh (3)

A
  • Fault tolerant; if device fails, message is simply re-routed
  • High performance; each network device is likely to be connected to multiple other devices
  • In wireless; each node extends range of network
24
Q

Dis. mesh (2)

A
  • Difficult & expensive to install
  • Difficult to manage due to high number of connections
25
Q

Wired connection

A

Involve a physical connection between the computer & the network

26
Q

Wireless connectivity

A

Does not require a physical connection between devices. Most transmit & receive radio signals

27
Q

Ad. wired (3)

A
  • Faster than wireless
  • Not easy to intercept/eavesdrop data
  • Less susceptible to interference
28
Q

Dis. wired (2)

A
  • Expensive to install & reconfigure
  • Requires many cables at a premises
29
Q

Ad. wireless (3)

A
  • No need for cable to connect devices/connect to internet
  • Allows users to use their own devices
  • Not dependent on having correct cable, therefore wider range of devices can comminucate witch each other/a network
30
Q

Dis. wireless (3)

A
  • Slower data transmission than wired
  • Data must be encrypted to prevent interception/eavesdropping
  • Walls, physical objects & interference from other wireless devices can adversely affect perfomance
31
Q

How are network data speeds measured?

A

Bits per second (Mbps, Gbps)

32
Q

Need for network protocols

A

Protocols allow connected devices to communicate with each other, regardless of their differences in their internal processes, structure & design.

33
Q

Protocol

A

A set of rules that control how communications between devices are formatted & how these communications will be sent & received

34
Q

SMTP (Simple Mail Transfer Protocol)

A

Used when emails are sent through the internet. Details format messages are sent in, the commands the email servers should understand & how they should respond to them

35
Q

POP 3 (Post Office Protocol V. 3)

A

Used for retrieving email from an email server. When client connects to mail server, they download any messages & then delete them from server

36
Q

IMAP (Internet Message Access Protocol)

A

Allows emails to be accessed using multiple email clients. Leaves messages on server until deleted by the client.

37
Q

Ethernet

A

Family of protocols used in wired LANs. Cover the physical & logical parts of a network

38
Q

WI-FI

A

Digital communication protocol that sets out how data is transmitted on wireless LANs

39
Q

TCP (Transmission Control Protocol)

A

Provides reliable connection between computers. Receiving computer is certain that it has received all data & data is identical to data sent. Used when accessing web pages, send/receive email or upload/download files.

40
Q

TCP/IP (Transmission Control Protocol/Internet Protocol.)

A

Collection of protocols that work together

41
Q

4 Layers of TCP/IP protocol stack

A

Application, Transport, Internet, Link

42
Q

Application

A

(Top layer which interacts with user to provide access to services & data that is sent/received over a network

43
Q

Transport

A

Manages end-to-end communication over a network. 2 Main protocols operating here are TCP & UDP

44
Q

Internet

A

Deals with sending data across multiple networks, from source network to destination network (routing)

45
Q

Link

A

Controls transmission & reception of data to/from a local network

46
Q

Packet

A

A small quantity of data being sent through a network

47
Q

How is data sent using TCP/IP?

A

Data broken up into packets

48
Q

What does packet header contain details of?

A
  • Sending computer
  • Receiving computer
  • The number of packets the data has been split into
  • Number of this packet
49
Q

Web server

A

Powerful computer system that stores web pages & any mulimedia that the pages might contain

Computer Science (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions