Chapter 2: Cabling and Topology Flashcards
Define: Physical Topology
How the cables physically layout in the network.
Define: Logical Topology
How the signals travel electronically.
Define: Hybrid Topology
Any form of networking technology that combines a physical topology with a logical topology.
Define: Star-Ring Topology
A hybrid topology that consists of a star physical topology and a ring logical topology.
Define: Star-Bus Topology
A hybrid topology that consists of a star physical topology and a bus logical topology.
Define: Mesh Topology
Used for wireless devices, every computer connects to every other computer via two or more routes.
Some routes may require traversing through another member of the mesh network.
Define: Partially Meshed Topology Network
At least two machines have redundant connections and every machine doesn’t have to connect to every other machine.
Define: Fully Meshed Topology Network
Every computer connects directly to every other computer.
Does coaxial cable shield data transmission from EMI?
Yes, via is braided metal shield.
What type of connector does coaxial cable use?
F-type connector
What two types of coaxial cables are used and what are their Radio Guide Ohms rating?
RG-6 at 75 Ohms
RG-59 at 75 Ohms
(RG-6 is the predominant cable used to connect modems to an ISP)
What is Twinaxial cable and when is it used?
Twinaxial cable is a type of coaxial cable that contains two central copper conductors. It is used as a substitute for short fiber connections between equipment within a rack. This is called a direct attached cable (DAC) when used this way.
What is twisted pair cabling?
Copper cabling consisting of 4 pairs of wires. Using a pair of twisted wires reduces crosstalk signal interference (the more twists the better).
What is shielded twisted pair (STP) cabling and how many types are there?
STP consists of twisted pairs of wires surrounded by shielding against EMI. There are 6 types, differentiated by which parts gets the shielding, the whole cable and/or individual pairs.
Define Cat ratings for twisted pair.
Rated in megahertz (MHz), Cat ratings indicate the frequency the cable can handle.
Define: Bandwidth
The maximum amount of data that goes through the cable per second described as bits per second (bps).
Cat 5 frequency and bandwidth
100 MHz
100 Mbps
Cat 5e frequency and bandwidth
100 MHz
1 Gbps
Cat 6 frequency and bandwidth
250 MHz
10 Gbps
Cat 6a frequency and bandwidth
500 MHz
10 Gbps
Cat 7 frequency and bandwidth
600 MHz
10+ Gbps
Cat 8 frequency and bandwidth
2000 MHz
25-40 Gbps
What connector does twisted pair use?
Technically 8 position 8 contact (8P8C) connectors but commonly called RJ-45 connectors (Network + uses the former)
Explain the two number designator used to define fiber-optic cables.
The first number is the core measurement and the second number is the cladding measurement, both in micro meters.
What are the two types of fiber-optic cables?
Multimode Fiber (MMF)
Single-mode Fiber (SMF)
What four connectors are used with fiber-optic cables?
ST (Single Tube)
SC (Single Cube)
LC (Little Cubes)
MT-RJ (Mechanical Transfer-Register Jack; slightly resembles RJ-45)
PVC-rated cable fire rating
Has no significant fire protection. PVC cable will create lots of smoke and noxious fumes.
Plenum-rated cable fire rating
Safe for the ceiling plenum space and a better choice for vertical runs between floors over riser-rated cables. If it goes in the ceiling or wall, make it plenum.
What does the IEEE 802 committee do?
Sets the standards for networking.
