Brainscape's Knowledge GenomeTM

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


See full index

Computer Science > 3.1 Networks > Flashcards

3.1 Networks Flashcards

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

Network

A

Set of computer or computer systems that are interconnected and share resources and data

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

Node

A

A device in a network

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

Client

A

A computer or a software application that requests a service from a server connected in the same network

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

Hub

A

Connection Point for all nodes on a single network connected via ethernet cables

DATA TRANSFER
Device–> Hub –> Device

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

Switch

A

Connection point but can identify which device is connected to which port. It will only send it to the target devices

Whereas Hub sends data to all devices

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

Router

A

Device that connects network to another network

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

LAN

A

Local Area Network

Networks connected within limited geographical are

(eg. home, school, office, etc.)

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

VLAN

A

Virtual Local Area Network

Devices from different segments in a LAN connected logically

(eg. LAN in a hospital with different departments)

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

WLAN

A

Wireless Local Area Network

Connects nodes in a limited geographical but without any wires

Less Secure than LAN

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

WAN

A

Wide Area Network

Connects computer systems or LANs from different geographical areas

(eg. internet)

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

SAN

A

Storage Area Network

Type of LAN designed specifically to handle large data transfers.

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

PAN

A

Personal Area Network

Network that covers individual’s working area, extremely small

(eg. iPhone and AirPods)

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

P2P

A

Peer to Peer Network

Uses a distributed networl architechture where all systems in teh network are all decentralized.
All nodes are clients and servers at the same time.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Standards

A

A set of guidelines and minimum requirements which must be matched by all networks. If they are not kept,

–>incompatability issues will arise

(eg. PCI Standard
Standard for a slot on motherboard and expansion cards. All cards that follow the PCI standard will be able to fit and communicate with the motherboard)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

3.1.3 Describe how communication over networks is broken down into different layers

A

–>Organising the network into layers makes the process less complex.

–>Each problem is spilt into distinct modules.

–>Each Layer carries out a sequence of operations

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

OSI Model

A

Physical
Data Link
Network
Transport
Session
Presentation
Application

“Please Do Not Take Steve’s Pet Alligator”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

TCP/IP model

A

describes all the functions that take place at each layer of protocols within the TCP/IP suite

–> Represents all the functionailty required for succesful communication between users.

Network
Internet
Transport
Application

“NITA” ambani

See Docs for Image

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

VPN

A

Virtual Private Network

Makes a tunneled network connection through the Internet or any other public network

–> Ideal for secure connections

–>Allows clients from distant locations to connect for reasons such as LAN not having cables long enough or WAN too far for secure connection.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Hardware/ Software Requirements of VPN

A
  1. Internet Access (S)
  2. VPN software (S)
  3. VPN router (H)
  4. VPN applicance (H)
  5. VPN concentators (in order to handle large groups) - (S)
  6. VPN servers (S)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Secure VPN

A

All traffic is encrypted/ authenticated and sent along virtual tunnels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Trusted VPN

A

All traffic relies on the security of a provider’s network to protect the network.

22
Q

Hybrid VPN

A

Combination of Trusted and Secure VPN.

23
Q

Site-to-Site VPN

A

Connects entire network and facilities secure data inchange between different sites.
–> Gateways are always used

Check textbook for image
p.147

24
Q

Remote-Accesss VPN

A

Connects Individual hosts to private networks and faciliites teleworkers who need access to their company’s network securely using the internet.

–> Host must have VPN client software installed.

25
Q

3.1.5 Evaluate the use of a VPN.

A

–> Communication is easier
–> Offers flexibility to remote workers
–> Improves security
–> Improves overall productivity

26
Q

Protocol

A

International rules that ensure the transfer of data between systems.

Strited Fixed Predefine
eg. TCP/IP

27
Q

Data Packet

A

Portion of a message that is transmitted through a network.

Contains data such as:
–> input
–> transmissions
–>storage or processing

28
Q

Data Integrity

A

The accuracy of data after input, tranmission, storage or processing

29
Q

Source Integrity

A

The identity of the sender has been validated.

Can be proven with Digital Signature.

30
Q

Flow Control

A

The process of directing the flow of execution of a program, allowing different parts of the program to be executed depending on certain conditions.

Determines the order of instructions to be executed

31
Q

Congestion Management

A

When the request on the network resources exceeds the offered capacity

32
Q

Error Correction

A

The ability to repair the error

33
Q

Error Checking

A

The process to determine the error

34
Q

Bandwidth

A

The theoretical speed of data in a medium

35
Q

Throughput

A

The actual transfer rate of data in a medium

36
Q

Bottleneck

A

In a network with many segments, the slowest segment creates a bottleneck that affects the throughput of the network

37
Q

Goodput

A

Measures the transfer rate of usable data

38
Q

Factors that affect the speed of data transmission

A
  1. Bandwidth of the network
  2. Data Transfer rate of storage devices
  3. Interferences
  4. Type of file
  5. CPU Speed
  6. Number of connected devices
39
Q

Data Compression

A

Reduces the size of files to be transmitted over a network

40
Q

Lossy Data Compression

A

A compression method that loses some information, No way to get the original file back

(eg. JPEG, MPEG2, MP3)

41
Q

Lossless Data Compression

A

This method reduces the number of bits by identifying and then eliminating any statistical redundancy. No loss of any data.

(eg. GIF)

42
Q

Wired Communication (5 kinds)

A

Copper Cable –> Common kind of cabling in computer networks

Coaxial Cable –> 2 copper conductors, low installation costs

Unshielded Twisted Pair Cable (UTP) –> Popular in LANs, easy to install, prone to electrical interference, Low installation costs

Shielded Twisted Pair Cable –> More difficult to instal that UTP.

Fiber Optic Cable –> Carries beam of Light, Expensive, offers higher speeds, Extremely secure

43
Q

Wireless Communication

A
  1. Microwave Radio
  2. Infrared
  3. RFID
  4. Bluetooth
  5. Free Space Optics
44
Q

Microwave Radio

A

Microwave Radio –> used extensively for mobile telephone networks and LANs. Information is carried through air.

Offers high bandwidth

Difficult to guarantee reliability

Weather can affect performance

eg. Satellites

45
Q

Infrared

A

Used only for short distances. Advanced Security. Cannot pass through objects

46
Q

RFID

A

Uses various radio technologies, needs internal power. No need for internal power source

47
Q

Bluetooth

A

Uses microwave radio to exchange radio. They transmit at very low power levels. Frequencies change regularly

48
Q

Free Space Optics

A

Use of lasers for wireless computer communication

49
Q

Characteristics of the different transmission

A

Check Textbook - p154

50
Q

Data Packet

A

Unit of information in a form suitable to travel between computers

51
Q

Packet Switching Communication Method

A

Refers to a communication method used in computer networks in which data are grouped in packets.

The original file is divided into packet before transmission and each packet may follow a different path to the destination

52
Q

Datagram Packet Switching

A

Each packet contains the receiver’s address
The path each packet takes can be different

Computer Science (13 decks)

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