Module 4
what are the categories of utp cables
3, 5, 6, 7 and 8
What is the WI-Fi standard and ability?
802.11 Uses CSMA/CA, a contention based protocol
What are the Bluetooth standard and abilities
802.15 Device pairing that allows communication over distances of 1 - 100 meters
what is an ethernet crossover?
A cable used to interconnect similar devices
What is a wireless access point?
A point that concentrates the wireless signals from user and connects to the existing copper based network infrastructure such a ethernet
what is single mode fiber?
A small core that sends one ray of light over vast distances. Uses laser technology high cost
What is a Wireless NIC Adapter?
An adapter that provides wireless communication capabilities to hosts
whatt are the physical layer specifications?
Data to radio signal encoding Frequency and power of transmission Signal Reception and decoding requirements Antenna design and construction
what is electromagnetic interference or radio frequency interference?
EMI and RFI signals can distort and corrupt the data signals being carried by copper media
what is an enterprise network?
IT infrastructure for midsize and large organizations
What organization creates industry standards for wireless data communications?
Institute of Electrical and Electronics Engineers (IEEE)
what is a multi mode fiber?
Larger core than single mode Uses Led tech lower cost less distance
what is a new advance in fiber optic technology?
Light can travel in two directions over one fiber instead of only one direction
Does a wireless LAN operate in a full duplex- allowing all devices to send or receive data at the same time so the number of users does not impact performance
No
What is the coverage area of wireless media?
Open environments are the best Certain materials and nature can block signals
Which fiber optic cable types can help data travel approximately 100 km?
Single mode
What is Zigbee?
Standard is 802.15.4 A specification that allows for low-data rate, low power communications
what are the different kinds of fiber optic connects?
Straight Tip Subscriber Connecter Lucent Connecter Simplex Connectors Duplex Multimode LC Connectors
Why does many devices slow down the connection?
Wireless Networks operate in a half duplex(only one device can send or receive at one time Too many devices doing that = smaller bandwidth for each devices
What is WiMAX?
Worldwide Interoperability for Microwave Access Provides wireless broadband access
What wireless standards is best suited for industrial and IOT environments?
Zigbee
what is a rollover cable?
a cable that connects workstations to routers or switch console ports
what is required for network communication?
a physical connection
What is a contention based protocol?
a protocol that allows multiple user to use the same spectrum without talking before hand
What is wireless media?
a third way to connect to the physical layer of a network
what is crosstalk?
adjacent copper wires pick up each others information
what does latency mean?
amount of time data takes to travel from one point to another
how are coaxial cables installed using cable internet?
cable service providers provide internet connectivity by replacing portions of the coaxial cable and supporting amplification of elements with the fiber optic cable.
how does a wireless install work?
coaxial cables attach antennas to wireless devices. The coaxial cable carries radio frequency energy between the antennas and the radio equipment
what is cancelltion?
designers now pair wires in a circuit in order to have opposing magnetic fields to cancel out cross talk
How does wireless media work?
it uses radio or microwaves to send binary digits of data communications
What is slows down the connection?
many devices trying to communicate at once
How is EMI and RFI defeated?
metallic shielding and grounding
how common is unshielded twisted pair?
most common out of the 3 copper types
Which fiber optic cable types can help data travel approximately 500 meters?
multi-mode
how is cross talk prevented?
opposing wires pairs are twisted together
What is a security flaw of wireless networks?
other people can access transmission
What can interfere with wireless networks?
phones, certain fluorescent lights microwave ovens and other wireless communications
what does the physical layer do?
provides a method of transporting bits that make up a data link layer frame across the network media
what is the difference between shielded twisted pair and unshielded?
shielded is more expensive and harder to install but it has better noise protection
Which fiber optic cable types is used to connect long distance telephony and cable TV applications?
single mode
what does throughput mean?
the measure of the transfer of bits across the media over a given period of time
What is goodput?
the measure of usable data transferred over a given period of time (through put minus traffic overhead)
what does varying the number of twister per wire pair achieve?
the more twisted pairs the more cancellation
What is an ethernet straight through?
the most common type of networking cable, used to interconnect a host to a switch and a switch to a router
how do fiber optic cables work?
they transmit data over longer distances and higher bandwidths using light impulses
What is require for a wireless LAN?
wireless access point + wireless NIC adapter
how are coaxial cables installed?
wireless and cable internet