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Information Processes and Technology > Communication systems > Flashcards

Communication systems Flashcards

1
Q

SSL

A

Secure sockets layer, encrypts data sent between website and browser

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2
Q

Handshaking

A

sender and receiver decide on a set of protocols for transmission

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3
Q

Synchronous transmission

A

continuous and consistent transfer of data

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4
Q

Asynchronous transmission

A

data is transmitted in regular intervals with gaps

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5
Q

Intranet

A

private network, secure environment

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6
Q

Extranet

A

private network extended to allow access to or from selected external organisations

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7
Q

Internet

A

completely public network to share and access information

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8
Q

Telecommuting tools

A
  1. video conferencing
  2. electronic mailing
  3. chat and messaging software (e.g. microsoft teams)
  4. public switched telephone network
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9
Q

Telecommuting (advantages)

A
  1. cut down on travel time
  2. improved motivation
  3. opportunity for greater work/life balance
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10
Q

Telecommuting disadvantages

A
  1. may not have proper accomodation to work effectively
  2. personal distractions - procrastination
  3. lack of social interactions - isolation
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11
Q

Volume test data

A

used to test if system can perform as intended even with large amounts of data, designed for systems that are subjected for large amounts of data

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12
Q

Role of a network administrator

A
  1. manage users
  2. manage logon procedures
  3. instillation of hardware and software
  4. maintenance and backups
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13
Q

Network diagram main components

A

Wired:
- lines to indicate cabling
- topologies
- boxes for PC
- switcher
- router
- cloud

Wireless:
- UTP
- cloud
- router

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14
Q

Email notation (BCC and CC)

A

BCC –> blind carbon copy, can see which CC have received the email but the CC do not know that the BCC have received the email

CC –> carbon copy, can see which CC have received the email

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15
Q

Microwave transmission media

A
  • Requires a clear line of sight between the sender and the receiver
  • Can be a very secure form of communication
  • Signals are usually transmitted over short distances (these would usually require only two antennae)
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16
Q

Satellite transmission media

A
  • Works best when there is a clear line of sight between the sender and receiver
  • Operates over larger distances (as the satellites are orbiting around the Earth)
17
Q

Star topology

A

all nodes are linked to the central server but not to each other

Benefit:
- Even if one node fails, the other clients and the server will be unaffected
- Central server helps to minimise data collisions
This is because star topologies use an Ethernet protocol and CSMA/CD to manage the flow of data

Disadvantage:
Topology is expensive to set up

18
Q

Ring topology

A

Does not require a central server and all nodes are connected to each other

Benefits:
- Does not require as many nodes as star topologies and a central server → very effective for small networks
- Uses Token ring to manage the flow of data and minimise collisions as there are less nodes as compared to star topology

Disadvantages:
If a cable or node stops working then the whole system doesn’t work

19
Q

Functions of a network operating software

A
  • Supporting workstations
  • Application sharing
  • Controlling printer access
20
Q

Gateway

A

connect networks with different transmission protocols

21
Q

Bridges

A

connect networks with the same transmission protocols

22
Q

Identifying suspicious email addresses

A
  • Domain name is not a standard domain name → @__domain name
  • Includes some form of threat → if you don’t update now, you must pay $200
  • Does not include information of how to contact the business
23
Q

Ethernet

A
  • Allows data to be transmitted simultaneously
  • Uses (CSMA/CD)
  • When collision detected, device stops transmitting
  • Used in star topologies
24
Q

Token Ring

A
  • Data collision → two devices send data at the same time
  • Continually passes tokens between nodes
  • Used in ring topologies
25
Q

Network topologies (list)

A
  • bus topology
  • star topology
  • ring topology
  • hybrid topology
  • mesh topology
26
Q

Bus topology

A
  • All devices are attached to a direct line
  • This is called the bus
  • Each device has a unique ID
  • Each device is connected to every other device
  • Can still operate if one node fails
27
Q

Bandwidth

A

The range of frequencies that can be transmitted through a medium (Higher bandwidth = increased capacity to transmit data)

28
Q

Error correction methods (list)

A
  • retransmission
  • error correction protocols
  • symbol substitution
  • error correction code
29
Q

Error detection methods (list)

A
  • parity check
  • checksum
  • cyclic redundancy check
  • TCP protocol
30
Q

Thin client vs. Fat client

A

thin client –> doesn’t have much processing power, relies on the server for power and storage.

fat client –> has enough processing power on its own, has its own storage which it can store and retrieve from

31
Q

Nodes in a network

A

Node refers to the devices present in the network.

32
Q

Client - server model

A

Client - relies on a server/network (device or program) - can’t do anything without that connection

Server - provides a specific resource for a network (e.g. file location, database, internet, email or printer

33
Q

Simplex transmission

A

Communication occurs in one direction only.

34
Q

Half-duplex transmission

A

Communication can occur in both directions but never at the same time.

35
Q

Full duplex transmission

A

Communication can occur in both directions and at the same time.

36
Q

Synchronous transmission

A

Continuous and consistent transfer of data. Type of serial transmission.

37
Q

Asynchronous transmission

A

Delays in the transmission of data. Data is transferred at irregular intervals.

Information Processes and Technology (5 decks)

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