Ketel Exam 2
Unidirectional or directional
Which kind of antenna is used in a point-to-point link?
Statistical multiplexing
Which kind of multiplexing assigns slots to nodes according to priority and need?
Coaxial
Which of the following cabling types is not recognized by the TIA/EIA for horizontal wiring?
Round Trip Time (RTT); Milliseconds.
How is latency measured and in what unit?
blackout
complete loss of power
ethtool
utility allows you to view and change NIC settings
analog signals
vary infinitely and continuously, appear as wavy line when graphed over time
Cat 6
What is the earliest twisted-pair cabling standard that meets the minimum requirements for 10GBase-T transmissions?
Layers 1 and 2
In which layer(s) of the OSI model do NICs operate?
Phase
Progress of wave over time compared to a fixed point
power redundancy
Providing a backup power source is called
Digital Signals
Pulses of voltage, 1 and 0
SNR (Signal-to-Noise Ratio)
Signals traveling through areas in which many wireless communications systems are in use will exhibit a lower _____ because of the high proportion of noise.
Surge protection
Standard generators do not provide_________ but can provide a backup power source
structured cabling
TIA/EIA created a joint cabling standard known as _____.
Frequency Channel
To exchange information, two antennas must be tuned to the same ______.
Standby UPS and Online UPS
Two UPS categories
Drawbacks of analog signals
Varied and imprecise voltage and imprecise voltage
Physical layout, logical topology, perimeter, access method, protocols, and network devices and connections.
What are some elements that are typically included in network diagrams?
Amplitude, Frequency, Wavelength, Phase
What are the four fundamental properties of an analog signal?
Standby and Online
What are the two general categories of UPSs?
integrated in to the motherboard/ installed in an expansion slot on the motherboard/ installed in a peripheral device.
What are three methods by which a NIC can interface with a computer's motherboard?
19 inches and 23 inches
What are two primary standard widths for rack systems?
Optical Loss
What characteristics of optical transmissions is primarily responsible for the distance limitations of fiber-optic cabling?
Amplifier, repeater
What device can boost an analog signal? A digital signal?
Surge protector
What device protects computer equipment from a momentary increase in voltage due to lightning strikes, solar flares, or electrical problems?,
KVM switch
What device provides a central control portal for all devices on a rack?
It scores the fiber strand for breaking but does not cut it.
What does a fiber cleaver do?
A loop-back plug is a connector that plugs into a port and crosses over the transmit line to receive line, to help redirect signals to CPA for testing.
What does a loop-back plug do?
It modulates digital signals into analog signals at the transmitted end, and then demodulates analog signals into digital signals at the receiving end.
What does a modem do?
Heat map
What feature of a site survey maps the Wi-Fi signals and other noise in your location?
Kevlar
What fiber is used in fiber-optic cabling to protect the inner core and prevent the cable form stretching?
Inverter
What generator component converts DC power from the generator to AC power that electrical infrastructure in a data center can use?
A graphical representation of a Network's wires infrastructure.
What is a wiring schematic?
Zenmap
What is the GUI version of Nmap for Windows?
Reflection or bounce back to source
When a wireless signal encounters a large obstacle, what happens to the signal?
802.11n
Which 802.11 standard can be used in both the 2.4 -GHz and the 5-GHz bands?
Class 1
Which Bluetooth class has the highest power output?
CSMA/CA
Which Carrier Sense technology is used on wireless networks to reduce collisions?
Cat 5e and higher
Which categories of twisted-pair cable can support Gigabit Ethernet?
5-GHz Band
Which frequency band offers 24 unlicensed communications channels in the United State?
Ethernet
Which of the following is not an example of a broadband transmission? A. cable TV B. Telephone signal C. Mobile voice D. Ethernet
Wi-Fi
Which on of the following wireless transmission types does NOT require a clear LOS to function?
Probe
Which part of a toner and probe kit emits a tone when it detects electrical activity on a wire pair?
Ethernet II frame
Which type of Ethernet frames do today's networks use?
NEXT
Which type of cross-talk occurs between wire pairs near the source of a signal?
Analog
Which type of transmission is measured by baud rate?
Issue data signals and assemble/disassemble data frames Interpret physical addressing information Perform routines that determine which node has the right to transmit data Can also perform prioritization, network management, buffering, and traffic-filtering functions
Why NIC's belong to both the Physical and data link layer
The end faces are placed at an angle to each other, so the reflection is sent back in a different direction than the source of the signal disconnecting and reconnecting cables.
Why do APC ferrules create less back reflection than do UPC ferrules?
Wireless networks experience a high number of collisions and require a greater overhead.
Why do wireless networks experience such a great reduction in actual throughput compared with their respective theoretical thoughputs?
The core of SMF is much narrower than that of MMF, and reflects very little. The light does not disperse as much along the fiber.
Why is SMF more efficient over long distances than MMF?
The standard suggests how networking media can best be installed to maximize performance and minimize upkeep.
Why is it important to use a structured cabling standard when installing and managing cabling systems?
Plenum cable is coated with flame-resistant jacket.
Why is it important to use plenum-rated cabling in the area above the ceiling tile?
Evil Twin
You just settled in for some study time at the local coffee shop, and you pause long enough to connect your computer to the Wi-Fi so you can listen to some music while you study. As you're about to sign in, you realize you clicked on an SSID called "Free Coffee and Internet." What kind of security trap did you almost fall for?
Guest networking
You're setting up a home network for your neighbor, who is a music teacher. She has students visiting her home regularly for lessons and wants to provide Internet access for their parents while they're waiting on the children. However, she's concerned about keeping her own data private. What wireless feature can you set up on her AP to meet her requests?
Rogue Access Point
You've just completed a survey of the wireless signals traversing the airspace in your employer's vicinity, and you've found an unauthorized AP with a very strong signal near the middle of the 100-acre campus. What kind of threat do you need to report to your boss?
1 San 2 Nas
__1__ is a network of multiple storage devices that collectively provide faster access to data and larger amounts of storage than a __2__ can do
NICs
______ interpret physical addressing information to ensure data is delivered to its proper destination
Fibre Channel
_______ connects devices within a SAN
Network maps
________ may show physical layout, logical topology, IP address reserves, names of major network devices, and types of transmission media
Rack Systems
_________ provide mounting hardware for network equipment to optimize the use of square footage in equipment rooms
Physical layer failures
__________ can be caused by a range of issues, including poor termination, excessive bend radius, damaged cables, and EMI
T
a SAN can be installed in a location separate from the LAN it serves
Uninterrupted Power Supply (UPS)
a battery-operated power source directly attached to devices and to a power supply-- prevents undesired fluctuations of power from harming device
Wiring schematic
a graphical representation of a network's wired infrastructure
NAS (network attached storage)
a specialized storage device or group of storage devices that provides centralized fault tolerant data storage for a network
Simplex
- signals may travel in only one direction
20, 40, 80, 120
802.11ac provides an advantage over 802.11n by incorporating increased channel bonding capabilities. What size channels does 802.11ac support?
Bluejacking
A Hacker takes advantage of a Bluetooth connection to send a virus to a user's phone. What kind of security breach has occurred?
Ad hoc
A student has completed his part of a group research paper, and needs to share it with a classmate. He sees the classmate as they're crossing the parking lot between classes. Which WLAN architecture could they use to transfer the file from one laptop to the other?
NFC
A user swipes her smartphone across a tag on a poster to obtain showtimes for a movie she wants to see later that evening. What wireless technology transmitted the data?
On boarding
An employee has lost his company-provided phone during a business trip. What process ensures that he can now perform a remote wipe?
Amplitude, frequency, wavelength, phase
Analog signals are characterized by four properties:
2
Ethernet is a Layer __ standard that is a flexible technology, capable of running on a variety of media
A short circuit is an unwanted connection. An open circuit is one where needed connections are missing
What is the difference between short circuits and open circuits?
The MDF, which may contain the demarc and other connectivity devices, such as switches and routers, and media, such as microfiber cable.
What is the first point on interconnection between an organization's LAN and WAN and a service provider's facility and what components are generally included at this location?
Layer 3
What is the lowest layer of the OSI model at which wired and wireless transmissions share the same protocols?
The number of twist per meter or foot. Help eliminate Crosstalk
What is the twist ratio and why is it important?
Rack unit, the industry standard height is 42U (about 6 feet tall).
What is the unit of measurement that defines the space available in a rack? How tall are standard racks?
Preamble
What is the very beginning of an Ethernet frame called?
Coaxial cable, coaxial cable, F-connector
What kind of cable uses BNC connectors? F-connectors? Which connector is likely to be used by cable TV?
Patch panel
What kind of networking device on today's racks does nothing to the data transmitted on line other than pass it along through the connection?
Auto Negotiation
allows the NIC to select the best link speed and duplex that is also supported by the neighboring device
Frequency modulation
carrier frequency modified by application of data signal
Wavelength
distance between one peak and the next
Noise
fluctuation in voltage levels caused by other devices on the network or EMI
network diagrams
graphical representations of a network's devices and connections
SANS
is a network of storage devices that communicate directly with each other and with other networks use Fiber Channel and iSCSI transport layer protocols are highly scalable and have: A very high fault tolerance Massive storage capabilities Fast data access
Amplitude
measure of strength at a given point in time
brownout
momentary decrease in voltage; also known as a sag
Surge
momentary increase in voltage due to lightning strikes, solar flares, or electrical problems
Frequency
number of times amplitude cycles over fixed time
Rack Systems
provide mounting hardware for network equipment to optimize the use of square footage in equipment rooms
Standby UPS
provides continuous voltage to a device by switching to the battery when it detects loss of power from wall outlet
Full-duplex (also called duplex)
signals are free to travel in both directions over a medium simultaneously
Half-Duplex
signals may travel in both directions over a medium but in only one direction at a time
Fault Tolerance
techniques that allow data storage or other operations to continue in the event of a failure or fault of one its components
Data modulation
technology modifying analog signals into digital signals and vice versa, making analog signals suitable for carrying data over a communication path
network mapping
the process of discovering and identifying the devices on a network
Online UPS
uses the AC power from the wall to continuously charge its battery, while providing power to the device through it's battery
