Chapter 2 Cabling & Topo. Flashcards
What is network topology?
The way that pieces of hardware connect to one another, via wired or wireless connection
What brings a bus network down if both ends aren’t terminated?
Reflection
What is a signaling/logical topology?
How signals travel electronically/the shape of signal flow inside the star box
What was the most successful star-ring?
IBM’s “Token Ring”
What are the two distinct types of cable?
Copper & Fiber-Optic
What are copper cables also called?
Coax
What are the 4 layers of copper/coax cables?
1) Central Copper Wire
2) Insulation
3) Braided Metal Shield
4) Jacket
What cable did early bus networks use?
Coax
What is coax primarily used for today?
Connect cable modem to ISP
What movement do coax connectors do to connect?
Screw-On
What connectors do coax cables typically use?
F-Type “Screw On”
What are the two coaxial cable types?
1) RJ-59: for cable television
2) RG-6: predominantly used today
What is RJ-59 coaxial cable used for and what is its Ohm rating?
Cable Television; 75 Ohms
What is RG-6 cable used for and what is its Ohm rating?
Typical coax used today by ISPs etc.; 75 Ohms
All coax cables have a ___ rating
Radio Guide (RG)
What is the Ohm rating?
IMPEDANCE: Defines how much a cable resists the flow of electricity, how long it takes to get a full charge, and capacitance
What cables do barrel connectors connect?
Two Coax Cables
What is twinaxial cable?
A type of coax; 2 central copper conductors wrapped around a single shield
When twinaxial is used to substitute short fiber connections inside a rack, what is it called?
DAC (Direct Attached Cable)
What interference does twisted pair reduce?
Crosstalk
Define Category (CAT) Ratings; What measurement is used?
MHz ratings which reflect the maximum frequency a cable can handle
What measurement is frequency measured in?
MHz
What measurement is bandwidth measured in?
Mb or Gb / second; (Gbps)
What is the max frequency for Cat 3?
16 MHz
What is the max frequency for Cat 5e?
100MHz
What is the max frequency for Cat 6?
250 MHz
What is the max frequency for Cat 6a?
500 MHz
What is the max bandwidth for Cat 3?
16 mbps
What is the max bandwidth for Cat 5e?
1,000 mbps / 1 gbps
What is the max bandwidth for Cat 6?
10,000 mbps / 10 gbps
What is the max bandwidth for Cat 6a?
10,000 mbps / 10 gbps
A MHz is how many hertz?
1,000,000 hertz
What is frequency?
Bits of data per second; 1 hertz is 1 bit of data per second
What is bandwidth?
Maximum amount of data that goes through the cable per second
What are bandwidth-efficient encoding schemes?
Squeezing more bits into the same signal if the cable is capable of handling it; Is why Cat 5e can handle 1,000 mbps while being rated for 100 mHz
What Cat of cabling is mainly used for modern networks?
Cat 6
What Cat(s) of cabling are organizations future-proofing with?
Cat 6a & Cat7
What connectors were used for old landline telephones?
RJ (Registered Jack)
What connector is used by phones and supports up to 2 pairs of UTP wires?
RJ-11
What are 8P8C connectors also called?
RJ45
What are RJ45 connectors also called?
8P8C (8 point, 8 contact)
What are the 4 components of fiber-optic cabling?
1) Core (glass fiber)
2) Cladding (reflects the light down)
3) Buffer/Fiber (buffer which adds strength)
4) Insulating Jacket
What type of fiber optic experiences modal distortion?
MMF (LED-based)
What is the first fiber optic connector called?
ST (twist)
What is the second fiber optic connector called?
SC (click)
What is the third fiber optic connector called?
LC (little couple meaning duplex)
What is the fourth fiber optic connector called?
MT-RJ (duplex)
Who sets the standards for networking?
IEEE
What is the (###)(?) Working Group also called?
IEEE 802
What is the IEEE (###)(?) also called?
802 Working Group
