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Business Information Systems > 6 Telecommunications, the Internet, and Wireless Technology > Flashcards

6 Telecommunications, the Internet, and Wireless Technology Flashcards

1
Q

What are the components of a simple computer network?

A
  • PC
  • Switch
  • Router
  • Server
  • Other networks: internet
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2
Q

What are protocols?

A

Rules that govern transmission of information between two points.

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3
Q

What is the Transmission Control Protocol/Internet Protocol?

A

(TCP/IP) is the common worldwide standard that is the basis for the Internet.

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4
Q

What are the four-five main layers of the Department of Defense reference model for TCP/IP?

A
  1. Physical layer
  2. Data Link layer (MAC)
  3. Network interface layer (IP)
  4. Transport layer (TCP/UDP)
  5. Application layer

• Internet layer

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5
Q

What does the Department of Defense reference model for TCP/IP consist of?

A

Four-five main layers.

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6
Q

What is the physical layer and what does it do?

A

The transceiver that drives the signals on the network.

It transmits and receives bits.

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7
Q

What is the data link layer responsible for and what does it do?

A

It is responsible for creating the and transferring frames with physical (MAC) addresses that move across the network.

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8
Q

What is the network layer responsible for and what does it do?

A

It is responsible for creating the packets with virtual (IP) addresses that move across the network.

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9
Q

What does the transport layer establish and what does it do?

A

It establishes the connection between applications with remote host on different hosts.
It is host-to-host communication that moves data between devices.

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10
Q

What is the application layer and what does it do?

A

It is the group of applications requiring network communications.
It generates the data and requests connections, between Host A (web browser) and Host B (web server).

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11
Q

What does the application layer ensure?

A

Ensures communication between applications on a network.

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12
Q

What is the first type of transmission media in the physical layer?

A
  • Twisted wire
  • Coaxial cable
  • Fiber optics
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13
Q

What is the twisted wire?

A

Copper wire twisted in pairs. Use in Ethernet LAN and DSL (Digital Subscriber Line).

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14
Q

What is the coaxial cable?

A

Thickly insulated copper wire

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15
Q

What are fibre optics?

A

Strands of clear glass fibre.

Ultrafast Broadband.

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16
Q

What is the second type of transmission media in the physical layer and its subtypes?

A

Wireless Communication.

  • Microwave
  • Cellular
  • Wi-Fi
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17
Q

What is Wireless Communication?

A

Use radio signals of various frequencies (Hertz) to transmit data.

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18
Q

What does a microwave do?

A

Transmit radio signals through the atmosphere.

19
Q

What does celullar do?

A

Use radio waves to communicate with radio antennas called cells. Example: 4G.

20
Q

What is Wi-Fi?

A

Wireless LANs and wireless Internet access based on 802.11 standards (300 feet from base station).

21
Q

What are the functions of the modem?

A
  • Digital (to computer).

- Analog (telephone line, cable system, wireless media, analog device).

22
Q

What is the purpose of the IP Address?

A

To locate your device.

23
Q

How do devices talk to each other?

A

Data transmission over the Internet through TCP/IP.

24
Q

What is packet-switching?

A

Method of slicing digital messages into parcels (packets), sending packets along different communication paths as they become available, and then reassembling packets at destination.

25
Q

How is packet switching efficient?

A

More efficiently uses network’s communications capacity.

26
Q

How is packet switching better than other types of networks?

A

Previous circuit-switched networks required assembly of complete point-to-point circuit.

27
Q

What does the pre-packet include before it is disassembled and reassembled?

A
  • Packet number
  • Message number
  • Destination
28
Q

What is LAN?

A

Local Area Networks that connect computers within a 500 metre radius.

29
Q

What is IPv6?

A

New addressing scheme for IP numbers that will provide more than a quadrillion new addresses.

30
Q

What is topology?

A

How components are connected together.

e.g. star, ring and bus topology.

31
Q

What is IPv6 designed for?

A

To allow the Internet to grow steadily, both in terms of the number of hosts connected and the total amount of data traffic transmitted.

32
Q

What is IPv6 not compatible with?

A

Current IPv5 addressing.

33
Q

What is VPN?

A

Virtual private network (VPN): secure, encrypted, private network run over Internet.

34
Q

What protocols are used for VPNs?

A
  • PPTP (point to point tunnelling protocol)

* Tunneling

35
Q

What is the internet?

A

A global system of interconnected computer networks that use the TCP/IP protocol to link devices worldwide.

36
Q

What is the world wide web?

A

Online content that is formatted in HTML and accessed via HTTP protocol.

37
Q

What is the main point of the internet?

A

A massive interconnection of computer networks around the world.

38
Q

What is the main point of the world wide web?

A

Service provided by the internet.

39
Q

What does the internet use?

A

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

40
Q

What does the world wide web use?

A

Uses Hyper Text Transfer Protocol (HTTP).

41
Q

What is a router?

A

A device that sends packets of data through different networks assuring they go to the correct address.

42
Q

What is client/service computing?

A

Distributed computing model where clients are linked to one another through a network that is controlled by a network server computer.

43
Q

What is a hub?

A

A networking device that sends packets of data to all other devices on the network.

Business Information Systems (9 decks)

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