Lesson 3: Understanding Wired and Wireless Networks
Recognizing Wired Networks and Media Types - Understanding media types Comprehending Wireless Networks - Understand Wireless Networking
Terms in this set (75)
The older standard BOGB cable.
The standard BOGB cable.
Twisted Pair Cables
has eight wires; they are copper conductors that transmit electric signals. These eight wires are grouped into four pairs: blue, orange, green, and brown.
blue, orange, green and brown.
Telecommunications Industry Association/Electronics Industries Alliance
568B = White/orange
568A = White/green
BOGB = White/blue
568B = Orange
568A = Green
BOGB = Blue
568B = White/green
568A = White/orange
BOGB = White/orange
568B = Blue
568A = Blue
BOGB = Orange
568B = White/blue
568A = White/blue
BOGB = White/green
568B = Green
568A = Orange
BOGB = Green
568B = White/brown
568A = White/brown
BOGB = White/brown
568B = Brown
568A = Brown
BOGB = Brown
Straight Through Cable
the most common type of patch cable, and it is the type that you would use to connect a computer to a central connecting device like a switch. The wires on each end of the cable are oriented in the same way.
used to connect like devices to each other, for example, a computer to another computer, or a switch to another switch.
medium dependent interface.
instead of using crossover cables to connect computers to central connecting devices such as switches, these central connecting devices are equipped with _______ ports, which take care of the cross.
medium dependent interface crossover
tests all of the pins of a connection one by one.
the signal degrades to such a point that it cannot be interpreted by the destination host.
Category 3 Cable Type
Category 5 Cable Type
Category 5e Cable Type
100 Mbps and Gigabit networks and is usually rated at 350 MHz, but actual speed varies depending on several different networking factors.
Category 6 Cable Type
Gigabit networks. Has different versions that run at 250 MHz and 500 MHz.
anything that disrupts or modifies a signal that is traveling along a wire.
Electromagnetic Interference (EMI)
This is a disturbance that can affect electrical circuits, devices, and cables due to electromagnetic conduction and possibly radiation.
Shielded Twisted Pair (STP) Cables
Have an aluminum shield inside the plastic jacket that surrounds the pairs of wires.
Radio Frequency Interference (RFI)
This is interference that can come from AM/FM transmissions and cell phone towers.
This is the electromagnetic (EM) field that is generated by a network cable or network device, which can be manipulated to eavesdrop on conversations or to steal data.
You could also use electromagnetic shielding on devices that might be emanating an electromagnetic field. This could be done on a small scale by shielding the single device, or on a larger scale by shielding an entire room, perhaps a server room. This would be an example of a ____________.
when the signal that is transmitted on one copper wire or pair of wires creates an undesired effect on another wire or pair of wires.
Near End Crosstalk (NEXT)
occurs when there is measured interference between two pairs in a single cable, measured on the cable end nearest the transmitter.
Far End Crosstalk (FEXT)
occurs when there is similar interference, measured at the cable end farthest from the transmitter.
Unshielded Twisted Pair (UTP)
Regular twisted-pair cabling
these cables have Teflon coating that makes them more impervious to fire.
Fiber Optic Cable
transmits light (photons) instead of electricity, and this light is transmitted over glass or plastic.
A cable with an optical fiber that is meant to carry a single ray of light-one ray of light, one mode. This type of cable is normally used for longer distance runs, generally 10 km and up to 80 km.
A cable with a larger fiber core, capable of carrying multiple rays of light. This type of cable is used for shorter distance runs, up to 600 meters.
Multi-mode fiber (The Medium) - Half duplex: 400 meters; full duplex: 2 km
Single-mode fiber (The Medium) - Full duplex: 10km
Wireless Network Adapters
allow for connectivity between a desktop computer or laptop and the wireless access pint.
used to extend the coverage of a wireless network.
similar to a wireless repeater, but the bridge can connect different 802.11 standards together; this is know as bridge mode.
Wireless LAN (WLAN)
a network composed of at least one WAP and at least one computer or handheld device that can connect to the WAP.
In order to ensure compatibility, the WAP and other wireless devices must all use the same __________.
54 Mbps (Data Transfer Rate) and 5 GHz Frequency
11 Mbps (Data Transfer Rate) and 2.4 GHz Frequency
54 Mbps (Data Transfer Rate) and 2.4 GHz Frequency
600 Mbps (Data Transfer Rate) and 5 GHz and/or 2.4 GHz Frequency
Multiple-Input Multiple Output (MIMO)
This means that wireless devices can have more antennas, up to four maximum.
the sending of two or more frames of data in a single transmission.
Wired Equivalent Privacy (WEP)
64-bit encryption level
Wi-Fi Protected Access (WPA2)
256-bit encryption level
Temporal Key Integrity Protocol (TKIP)
128-bit encryption level
Advanced Encryption Standard (AES)
128-,192-, and 256-bit
port based network access control (PNAC)
Port Based Network Access Control (PNAC)
provides strong authentication to devices that need to connect to the WLAN; it can also be used for regular wired LANs.
Occurs when wireless clients connect to and are authenticated by a wireless access point, which can be expanded by creating a wireless distribution system-a group of WAPs interconnected wirelessly.
Service Set Identifier (SSID)
When utilizing infrastructure mode, the base unit (normally a WAP) will be configured with a _____________. This then becomes the name of the wireless network, and it is broadcast over the airwaves.
occurs when all of the clients communicate directly with each other. There is no base or wireless access point.
What is the most common cable used today?
If you are making a crossover cable and one end is 568A, what should the other end be?
If you want to connect a computer directly to another computer without using a switch, you use a _____________.
You need to connect a twisted-pair cable to the back of a patch panel. What tool should you use?
What is the minimum category of twisted-pair cable you need to support 100 Mbps?
Radio Frequency Interference (RFI)
When you pick up your wireless phone, your computer drops network connectivity. What could be the cause of the problem?
you are setting up a network within a warehouse using Category 6 UTP. however, parts of the network are down because of the heavy machinery used. What cable type should you use?
What do you call it when electrical signals jump to another set of wires?
What type of cable should be used as part of a fire code for a building?
What is the maximum speed supported by 802.11b?
What is the maximum speed supported by 802.11g?
Radio Frequency Interference (RFI) Protection
Which of the following is not a characteristic of 802.11n?
What is the most secure encryption used in wireless networks?
Service Set Identifier (SSID)
What is used to identify a wireless network?
To test a cable, what tool would you use?
For organizations, using, authentication for wireless networks is recommended.
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