Chapter 2 - Cabling and Topology Flashcards

(38 cards)

1
Q

Bus Topology

A

Connected all computers in a line using a single cable
Entire network stops working if cable breaks at any point

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2
Q

Ring Topology

A

Connected all computers with a ring of cable
Entire network stops working if cable breaks at any point

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3
Q

Star/Hub and Spoke Topology

A

Used a central connection box for all computers on the network
Offers fault tolerance, if one cable broke all the other computers could still communicate with the central point
Not very successful because Bus/Ring popular and inexpensive

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4
Q

What are the drawbacks of Bus and Ring Topologies?

A

Entire network stops working if cable breaks at any point

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5
Q

Physical Topology

A

How the cables physically look

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6
Q

Logical Topology

A

How the signals travel electronically

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7
Q

Mesh Topology

A

Every computer connects to every other computer via two or more routes

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8
Q

Partially Meshed

A

At least two machines have redundant connections, but not all machines are directly connected

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9
Q

Fully Meshed

A

Every computer connects to every other computer

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10
Q

Coaxial Cable

A

Contains central copper conductor wire surrounded by insulating material which is then surrounded by a braided metal shield
Shields data transmissions from EMI

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11
Q

F-type Connector

A

Connector that screws in

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12
Q

All coaxial cables have a ___ rating

A

Radio Guide (RG)

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13
Q

Ohm Rating

A

Relative measure of resistance on the cable
Only important measure of coax

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14
Q

Twinaxial Cable

A

Type of coax that contains two central copper conductors wrapped around a single shield
Generally used between equipment in a rack, like switches

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15
Q

When twinaxial cable is used between equipment in a rack, it is called ___

A

Directly attached cable (DAC)

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16
Q

Twisted Pair

A

Each pair in cable works as a team either transmitting or receiving data.

17
Q

What is the benefit of cable using a pair rather than a single wire?

A

Reduces crosstalk

18
Q

STP

A

Shielded Twisted Pair
Twisted pairs surrounded by shielding to protect against EMI

19
Q

UTP

A

Unshielded Twisted Pair
Twisted pairs surrounded by a plastic jacket. No protection against EMI, so when installing must be careful.
Much less expensive

20
Q

Cat Ratings

A

Designed to help network designers get the right cable for the right technology
Rated in megahertz (MHz)

21
Q

MHz

A

Megahertz
Indicates highest frequency cable can handle

22
Q

Bandwidth

A

Maximum amount of data that goes through the cable per second

22
Q

RJ-45

A

Common name for UTP cable connectors.
This name is incorrect but has become so common its now the standard name.
True name is 8 Position 8 Contact (8P8C)

23
Q

Fiber Optic Cable

A

Transmits light instead of electricity. Can be regular or laser light.
Requires two cables, one for sending, one for receiving.

24
Where is fiber optic especially beneficial?
Areas with high EMI Long distance transmissions
25
What does fiber optic cable consist of?
Core - glass fiber itself Cladding - part that makes light reflect down the fiber Buffer Insulating Jacket
26
Multimode Fiber
Uses LEDs to send light signals
27
Single Mode Fiber
Uses laser signals
28
Modal Distortion
Signals sent at the same time don't arrive at the same time because the paths differ slightly in length Single Mode Fiber prevents this
29
Nanometers (nm)
Measurement of light wavelength Fiber optic cabling rated in nanometers
30
PVC
No significant fire protection, if burned it creates a lot of smoke and fumes
31
Plenum
Creates way less smoke and fumes than PVC but is 3-5x more expensive. Required for most city ordinances
32
IEEE
Institute of Electrical and Electronics Engineers Defines industry wide standards that promote the use and implementation of technology
33
IEEE 802 Committee
Defines frames, speeds, distances, and types of cabling to use in a network environment
34
802.1
Higher Layer LAN protocols
35
802.3
Ethernet
36
802.11
Wireless LAN
37
802.15
Wireless Personal Area Network