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