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Network+ > Chapter 2: Cabling and Topology > Flashcards

Chapter 2: Cabling and Topology Flashcards

1
Q

Topologies

A

Ways of connecting computers and other devices

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2
Q

Which are the historical topologies?

A

Bus, star, and ring

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3
Q

Bus topology

A

Single cable that connected all computers in a line

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4
Q

Ring topology

A

Connected all computers with a ring of cable

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5
Q

What does a bus network need at the end of the cables to prevent a signal from reflecting ?

A

Termination

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6
Q

What was the weakness of both bus and ring topologies?

A

The entire network stopped working if the cable broke at any point

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7
Q

Star topology (hub-and-spoke)

A

All computers on the network are connected to a central connection box

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8
Q

What was the benefit of the star topology ?

A

Offered fault taulerance

If a cable broke, all of the other computers could still communicate

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9
Q

Physical topology

A

How the cables physically look

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10
Q

Logical topology or signaling topology

A

How the signal travels electronically

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11
Q

Hybrid topology

A

Any form of networking technology that combines a physical and logical topology

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12
Q

Which reigns supreme? Star-bus or star-ring ?

A

Star-bus

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13
Q

Mesh topology

A

Wireless networks where every computer connects to every other computer via two or more routes

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14
Q

Partially meshed topology

A

At least two redundant connections

Every machine doesn’t connect to every other machine

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15
Q

Fully meshed topology

A

Every computer connects to every other computer

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16
Q

Network technology

A

Practical application of a topology and other critical tools that provides a method to get data from one computer to another on a network

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17
Q

What are the two distinct groups of cabling in the networking industry?

A

Fiber and copper

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18
Q

What are the two primary types of copper cabling ?

A

Coaxial and twisted pair

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19
Q

Coaxial cable

A

Central copper conductor wire surrounded by an insulating material which is surrounded by a braided metal shield

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20
Q

What is the outer mesh layer of the coaxial cable for ?

A

To shield the center wire from EMIs

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21
Q

Where are coaxial cables used ?

A

Connecting a computer to a cable modem. Also connects to satellite receiver and cable TV

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22
Q

Which connector screws on for a secure connection ?

A

F-type connector

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23
Q

Which is the primary calbing used today between RG-59 and RG-6?

A

RG-6 because it is more robust

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24
Q

Impedance

A

How much a cable resists the flow of electricity

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25
How do you get both television and the internet from cable ?
Coaxial splitters
26
Twinaxial cable
Contains two central copper conductors. Substitute for fiber in short connections
27
Another name for twinaxial ?
Direct attached cable (DAC)
28
What is the most common type of cabling used in networking?
Twisted pair
29
What interference is reduced with a twisted pair cable ?
Crosstalk
30
Shielded twisted pair (STP)
Twisted pairs of wires surrounded by shielding to protect from EMI
31
Unshielded twisted pair (UTP)
Twisted pairs of wire surrounded by a plastic jacket
32
Does the UTP plastic jacket protect from EMI ?
No
33
Category(cat) ratings
Variety of grades for twisted pair rated in megahertz (MHz) indicating the highest frequency the cable can handle
34
What are the TIA recognized cat rating cables ?
Cat 3, Cat 5e, Cat 6, Cat 6a
35
What are the groups that set the standards for cabling and networking in general? Top to bottom
International Organization for Standardization (ISO), American National Standards Institute (ANSI), Telecommunications Industry Association (TIA)
36
Bandwidth
Maximum amount of data that can travel through the cable per second
37
Each cycle per second (or hertz) accounts for ______ per second ?
Data
38
Bandwidth-efficient encoding schemes
Squeeze more bits into the same signal as long as the cable can handle it
39
Which cables are used to future proof the network ?
Cat 6a or Cat 7
40
8P8C
8 position 8 contact
41
What is 8P8C referred as ?
RJ-45 connectors
42
Fiber optic cable
Transmits light. Attractive for high EMI areas and long distance transmissions
43
Four components of fiber ?
Glass fiber itself (core), cladding (reflects light down the fiber), buffer (material for strength), and insulating jacket
44
What are some common fiber optic micrometer cable sizes ?
9/125, 50/125, and 62.5/125 micrometer um
45
Do network technologies require pairs of fiber optic cable ?
Yes, one fiber cable for sending, the other for receiving
46
Duplex fiber optic cabling
Two stands of plastic or glass fiber where separate transmission and receiving are required
47
Multimode fiber (MMF)
Fiber optic cable that uses LEDs
48
Single-mode fiber (SMF)
Fiber optic cables using lasers
49
Single-mode fiber (SMF)
Fiber optic cables using lasers
50
What does SMF prevent, which is a unique problem for MMF ?
Modal distortion Signals are sent at the same time that don't arrive at the same time because paths differ slightly in length
51
Wavelength for MMF cables ? (In nanometers)
Transmit 850 nm or 1300 nm wavelengths
52
Wavelengths for SMF cables ?
1310 nm or 1550 nm depending on the laser
53
What are the MMF standard prefixes ?
OM1, OM2, OM3, OM 4, OM5
54
Which OM are for short runs using LEDs
OM1 and OM2
55
What can OM3, OM4, and OM5 use for transmitting ?
Can use lasers running at higher bandwidths
56
Color coded various fiber types
SMF is yellow. OM1 and OM2 are orange. OM3 and OM4 are aqua. OM5 is lime green
57
Four common connector types for fiber ?
ST, SC, LC, and MT-RJ
58
Which fiber connectors are always duplex ? Meaning both the send and receive cables are attached.
LC and MT-RJ
59
Two most common cabling fire ratings ?
PVC and plenum
60
Does PVC have fire protection?
No significant protection
61
Benefit and downside of plenum ? Is it required ?
Creates less smoke and fumes but costs three to five times more than PVC. Most cities require plenum
62
If cabling is in the walls, which fire rating cabling should be used ?
Plenum
63
What committe defines networking standards ?
IEEE 802
64
Why was the IEEE 802 broken down into different subcommittees?
No one cabling solution would work for all needs
65
What is the most common category of UTP used in new cabling installations
Cat 6 for now, but Cat 6a and 7 are gaining popularity

Network+ (8 decks)

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