Cabling and Topology CH 3 Flashcards
Who creates the network technology standards
IEEE Committees
What is a Bus Topology
All computers are connected to a single wire.
NOTE; each node is connected to a single cable, by the help of interface connectors. This central cable is the backbone of the network and is known as the bus (thus the name). A signal from the source travels in both directions to all machines connected on the bus cable until it finds the intended recipient. If the machine address does not match the intended address for the data, the machine ignores the data. Alternatively, if the data matches the machine address, the data is accepted. Because the bus topology consists of only one wire, it is rather inexpensive to implement when compared to other topologies. However, the low cost of implementing the technology is offset by the high cost of managing the network. Additionally, because only one cable is utilized, it can be the single point of failure
What is a Ring Topology
A ring topology is a bus topology in a closed loop. Data travels around the ring in one direction
Data travels around the ring in one direction. When one node sends data to another, the data passes through each intermediate node on the ring until it reaches its destination.
A terminator does what?
Prevent a signal sent from one computer from reflecting at the ends of the cable.
If not in place it will quickly bring down a network in a Bus topology.
What is a common problem that Bus and Ring typologies face?
The entire network stops working if the cable breaks at any point.
In a bus topology the broken connection will cause a reflection as the terminator is no longer in line.
What is a Star topology?
Uses a central connection box for all the computers on the network. If one cable breaks all the other computers can still communicate.
What was the most popular of the Hybrid star ring topology.
Token Ring, Manufactured by IBM
what is a physical topology?
How the cables physically look
What is a Logical Topology?
How the signals travel electronically
What is a Partial Mesh topology?
Every computer connects to every other computer via two or more routes.
What is a Fully Meshed topology?
Every computer connects directly to every other computer
What is a point to multipoint mesh Topology?
Single system acts as a common source through which all members of the point-to-multipoint network converse. Compared to a star the key difference is a smart system sits at the middle.
What is a Point to Point Mesh Topology
two computers connect directly together with no need for a central device of any kind.
What is a Coaxial Cable Copper Cable?
contains a central conductor wire. Shields data from EMI.
Jacket | Braided Metal Shield | Insulation | Center Wire
Where is Coaxial Cables primarily used?
To connect a ISP to a modem
What does OHM rating measure?
Describes the impedance of that able. Impedance describes a set of characteristics that define how much a cable resits the flow of electricity.
What is a Twisted Pair Copper Cable?
Twisted pairs of cables bundled together into a common jacket.
What does twisting the wires in a twisted pair copper cable acheive?
Reduces the EMI (Electromagnetic Interference)
What is a Shielded Twisted pair (STP) copper cable?
Consists of twisted pairs of wires surrounded by shielding to protect them from EMI.
STP is used in locations with excessive electronic noise.
What is a Un-shielded Twisted Pair (UTP) Copper Cable?
consists of twisted pairs of wires surrounded ya plastic jacket. Jacket does not provide protection from EMI.
Inexpensive and most commonly used. Must avoid florescent lights and other electronics to avoid EMI.
CAT ratings use gigahertz. True/False
False it uses Megahertz
Why are CAT ratings used?
To help network installers get the right cable for the right network technology.
CAT6
100 meters, 250 Mhz, 10/100/1000BaseT networks. with 10gBaseT networks Cat 6 is limited to 55 meteres
CAT 6a
100 meters, 500 mhz, 10/100/1000BaseT, 10GBaseT.
What is Bandwidth?
Maximum amount of data that goes through the cable per second.
Why was Bandwidth efficiency encoding schemes developed?
To allow the cable to squeeze more bits into the same signal as long as the cable can handle it. (Cat 5e cable can handle a throughput of up to 1000 Mega Bits per Second Mbps with only 100 MHz. With out the efficiency it would only do 100Mbps.
Where is the CAT rating located on a UTP?
On the boxed Reel, On the Cable itself.
RG-6, RG-59 are examples of what kind of cables?
Coaxial Cables
How does a Fiber Optic Cable work?
Transmits light, does not suffer from EMI and good for long distance transmissions. Up to 10km
ST stands for what?
Snap and Twist
SC stands for what?
Stick and Click
LC stands for what?
Little Connector (Duplex)
FC What is it?
Its the connector you screw into place (eliminates problems with high vibration envieroments.)
What are the two most common cable fire ratings?
PVC (Polcy-vinyl chloride) Plenum
PVC fire rating has significant fire protection? True/False
False - PVC offers no significant fire protection
Plenum is 3 to 5 times the cost as much as PVC rated cables. True/False
True - Plenum can cost 3-5 times higher to produce and yields much less smoke and chemicals when burnt.
The IEEE 802 group defines what types of standards?
Network Standards ( Frames, Speeds, Distances, and types of cabling to use in a network envieroment)
The 802.3 Committee creates the standards for what networking technologies?
Ethernet ( a lot of subcommittees exist)
The 802.11 Committee creates the standards for what networking technologies?
Wireless LAN (WLAN) such as WiFi ( a lot of subcommittees exist)
Coaxial cables all have a _________ Rating
OHM
RJ-45 is an example of what type of cable
Twisted pair connector. Can be STP or UTP.
What is the most common type of UTP cabling installation
CAT 5e
