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Core 1 > Networking Basics (2.2, 2.4, 2.7, 2.8 and 3.1) > Flashcards

Networking Basics (2.2, 2.4, 2.7, 2.8 and 3.1) Flashcards

1
Q

What is a switch?

A

A smart hub that remembers the ports that are connected to it

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2
Q

What is a hub, and how many ports can it have?

A

A network hardware device for connecting multiple Ethernet devices together and making them act as a single network segment. It can have between 4 and 48 ports.

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3
Q

Difference between a managed and unmanaged switch?

A

Performs functions with configuration; performs functions without configuration

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4
Q

What is a router used for?

A

Connecting different networks together.

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5
Q

What is a wireless access point?

A

A device that allows wireless devices to connect to a wired network.

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6
Q

What does a firewall do?

A

Scans and blocks traffic that enters or leaves a network. Can be based on preconfigured rules.

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7
Q

What is a patch panel?

A

A device that allows cable network jacks to go from a wall into a central area.

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8
Q

What is PoE?

A

Electrical power from a switch port over an ordinary data cable to a power device.

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9
Q

What does a power injector do?

A

Plugs into a wall outlet to get power

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10
Q

What does a cable modem do?

A

Translates coaxial cable signals into radio frequency waves .

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11
Q

What does a DSL modem do?

A

Translates coaxial cable signals into phone lines

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12
Q

What does an Optical Network Terminal (ONT) do?

A

Terminates fiber connection.

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13
Q

What is software defined networking?

A

A way of virtualising the network hardware

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14
Q

What does a LAN do?

A

Connects components within a limited distance; up to a few hundred feet

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15
Q

Define a campus area network.

A

Connects LANs that are building-centric across a university, industrial park or business park; up to a few miles

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16
Q

What does a metropolitan area network do?

A

Connects scattered locations across a city or metro area (up to about 25 miles)

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17
Q

What does a wide area network do?

A

Connects geographically disparate internal networks and consists of leased lines or VPNs; worldwide coverage

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18
Q

What is a wireless LAN?

A

A wireless distribution method for two or more devices that creates a LAN using wireless frequencies

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19
Q

What does a storage area network do?

A

Provisions access to configurable pools of storage devices that can be used by application servers

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20
Q

How does a SoHo LAN work?

A

Uses a centralised server or simply provides clients access to local devices

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21
Q

What is the Internet of Things?

A

A global network of appliances and personal devices that have been equipped with sensors, software, and network connectivity to report state and configuration

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22
Q

What does a registered jack do?

A

Carries voice or data which specifies the standards a device needs to meet in order to connect to the phone or data network

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23
Q

What is bandwidth?

A

The theoretical measure of how much data could be transferred from a source to its destination

24
Q

How far can keep cable run?

A

Under 70m, from the IDF to the office

25
Q

Define throughput.

A

The actual measure of how much data is successfully transferred from a source to its destination

26
Q

What is Ethernet Standard?

A

A designation given to a particular category that provides the ability to understand the bandwidth and the cable type to be used

27
Q

What is a Straight-through cable (patch cable)?

A

Contains the exact same pinouts on both ends of the cable

28
Q

What is the standard that is preferred when wiring jacks inside of buildings?

A

568b

29
Q

What special ability does a crossover cable have?

A

The ability to take send and receive pins from one cable and swap those on the other end

30
Q

What is a medium dependent interface crossover?

A

An automated way to electronically simulate using a crossover cable

31
Q

What is direct burial?

A

A cable rating that specifies that a cable has a stronger sheathing and jacket that can withstand more extreme weather conditions

32
Q

What does it mean if a cable is plenum rated?

A

It is more fire resistant and minimises the amount of dangerous fumes that are released

33
Q

How does fiber optic cable trasmit information?
Name two benefits of using fiber optic.

A

By using light from an LED or laser through a thin glass fiber
Greater usable range and greater data capacity

34
Q

List three possible hardware types that can become a limitation on fiber optic

A

Switches, routers and end-user devices

35
Q

When would you use single mode fiber (SMF), and how is it different to normal fiber optic?

A

You would use it for longer distances; it has a smaller core size which allows for only a single mode of travel for the light signal

36
Q

What is the diameter of the core size of SMF?

A

8.3^-10 u

37
Q

Give some characteristics of multimode fiber (MMF).

A

Used for shorter distances; larger core size which allows for multiple modes of travel for the light signal
50-100u core size diameter
2km or less

38
Q

Is SMF or MMF more expensive?

A

SMF

39
Q

What is twinaxial cable?

A

Similar to coaxial cable but uses two inner conductors to carry the data instead of just one.

40
Q

What is coaxial cable?

A

A type of electrical cable consisting of an inner conductor surrounded by a concentric conducting shield, with the two separated by a dielectric (insulating material)

41
Q

When would you use a snip/cutter?

A

To cut a piece of cable off a larger spool or run of cable

42
Q

When would you use a cable stripper?

A

When preparing the end of a cable for attachment to a connector

43
Q

What is a cable crimper used for?

A

Attaching the connector to the end of the cable

44
Q

What is a wire mapping tool?

A

Works like a cable tester, but specifically for twisted pair ethernet cables

45
Q

List six problems that might occur in twisted pair cable configurations.

A
  • Open pairs
  • Shorted pairs
  • Short between pairs
  • Reversed pairs
  • Crossed pairs
  • Split pairs
46
Q

What tool is used to determine a cable’s category or data throughput?

A

A cable certifier

47
Q

What does a punch-down block do?

A

Terminates the wires and strips off excess installation and extra wires that are no longer needed

48
Q

How would you use a tone generator and toner probe?

A

Generate a tone on one end of the connection and use the probe to audibly detect the wire connected on the other side

49
Q

What does a loopback adapter/device do?

A

Facilitates the testing of simple networking issues

50
Q

What does a tap do?

A

Connects directly to the cable infrastructure and splits or copies those packets for analysis, security, or general network management

51
Q

What does a wireless analyser do?

A

Ensures proper coverage and prevents overlap between WAP coverage zones and channels

52
Q

Name the first three layers of the OSI model.

A
  1. Physical layer
  2. Data link layer
  3. Network layer
53
Q

Name layers 4-7 of the OSI model.

A
  1. Transport layer
  2. Session layer
  3. Presentation layer
  4. Application layer
54
Q

Name the OSI layer fitting this description: “Decides which physical path the data will take.”

A
  1. Network layer
55
Q

What does the OSI presentation layer do?

A

Ensures that data is in a usable format; encrypts data

56
Q

Describe what the OSI application layer does.

A

It provides protocols that allow software to send and receive information and present meaningful data to users.

Core 1 (27 decks)

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