Test: Field Tech II - III Conventional
Which of the following is an advantage of 802.11b direct sequence spread spectrum (DSSS) over 802.11 frequency hopping spread spectrum (FHSS)?
**Data throughput
Antenna diversity is a solution to which one of the following wireless local area network (LAN) problems?
**Multipath
7 3/8 divided by 7 1/4 =
1 1/58
What is the width of direct sequence spread spectrum (DSSS) channels and how far apart are their center frequencies spaced?
22 megahertz (MHz) and 5 MHz.
(20) / (-4) + (-2) x (-10) - (-2) x (7) =
29
What level of encryption is created by a Wired Equivalent Privacy (WEP) key that uses a 40-bit secret key concatenated with the initialization vector to form the WEP key?
64 bit.
A transmitter outputs 100 milliwatts (mW). An antenna cable connects the transmitter to an amplifier, and the power into the amplifier's input measures 50 mW. The amplifier increases the signal to the original transmitter's power level and sends the signal to the antenna. The antenna receives the signal from the amplifier at 75 mW, and then transmits at 150 mW. What is the intentional radiator's (IR) power level in this radio frequency (RF) circuit?
75 mW
(480 x 10 to the power of -5) divided by (60 x 10 to the power of -3) =
8 x 10 to the power of -2
Which of the Institute of Electronics Engineers (IEEE) wireless LAN standards listed below is the only one that includes infrared technology?
802.11
What uses the 2.4-GHz band and runs at 54 Mbps?
802.11g
When a pre-connectorized fiber is not attached to equipment, what should be attached to help keep it clean?
A dust cap
What type of wireless local area network (WLAN) attack could cost an employee their job because network usage logs point directly to the employee whenever a hacker gains access to the employee's domain login information and causes havoc on the network?
A passive attack.
It is essential to pay attention to warning signs of stress overload. Poor attitude is one of the behaviors that may indicate that you are overstressed. What are the symptoms of poor attitude behavior?
A significant change in attitude with a noticeable movement toward negative, hostile, cynical, or paranoid thoughts
What is a slot time in an IEEE 802.11 wireless local area network (WLAN)?
A standard period of time on a WLAN that each station multiplies by a random number to determine the length of time to wait before performing a clear channel assessment (CCA).
Which should be used to cut the fiberdrop's buffer tube?
A tube cutter
What is a half-duplex device that is only capable of Open Systems Interconnection (OSI) reference model Layer 2 connectivity?
A wireless bridge.
What is the last step of the basic wireless access point (WAP) setup?
Apply security.
What is one reason why broadband cable operators install fiber-optic cable in stages instead of changing the infrastructure all at once?
Changing the infrastructure all at once would cause too many service disruptions.
During which step of the six-step troubleshooting process for a digital TV (DTV) service problem are quadrature amplitude modulation (QAM) channel measurements typically taken?
Diagnosing symptoms.
Simplify and solve the equation: If E = IR then I = ?
E/R
As a general rule, how does an increase in effective isotropic radiated power (EIRP) relate to the link budget range?
Each 6 decibels (dB) increase in EIRP equates to a doubling of range.
What should you avoid to prevent stress?
Excessive caffeine
Which of the following wire color combinations make up quad station wire?
Green, red, black, yellow
Operation as an IEEE 802.11ac device occurs only in the 5 gigahertz (GHz) Unlicensed National Information Infrastructure (U-NII) radio band, so how are 802.11ac devices able to maintain compatibility with earlier standards that operate in the 2.4 GHz Industrial, Scientific, and Medical (ISM) radio bands?
IEEE 802.11ac devices also operate in the 2.4 GHz ISM range.
Which term describes the operation mode of a basic service set (BSS)?
Infrastructure mode.
Which term describes the RF loss incurred when an item or component is introduced into an RF circuit?
Insertion loss
Why is the Carrier Sence Multiple Access/Collision Avoidance (CSMA/CA) protocol used to prevent collisions in a wireless local area network (LAN)?
It is impossible to detect collisions on a wireless LAN
What statement best describes frequency-hopping spread spectrum's (FHSS) use of frequency agility?
It refers to a radio's ability to change transmission frequency abruptly within the usable RF frequency band.
Wireless internet service providers (ISP) provide which of one of the following services?
Last mile data delivery
A customer reports a problem of no dial tone (NDT). Upon inspection, the technician notices that new carpeting has been installed. What should the technician do next?
Look for a cable that runs under the carpet; it is likely that the cable has a short from the carpeting tack strip.
Which of these components is used in a passive optical network (PON)?
Optical splitters.
Which one of the following tasks is the best choice for troubleshooting the near/far problem?
Review the location of the stations (clients) on the network.
What are some requirements of a wireless local area network (WLAN) in a hospital that make it an effective training ground for individuals who want to immerse themselves in WLAN technology?
Roaming across large distances, a limited number of users on an access point (AP) due to mandated security, and medical applications that are often connection-oriented between the client and server.
When troubleshooting a digital TV (DTV) authorization issue, what can be verified using the set-top box (STB) diagnostic page?
STB reception of authorization message data.
Which of the following is a multicast control protocol between the cable modem and the CMTS that works in harmony with the downstream channel bonding for efficient and extensible support for multicast applications?
Source-specific multicast (SSM)
Which step in the troubleshooting process requires a discussion with the customer to gather more detail about the problem?
Step 1: Identify the problem.
What wireless local area network (LAN) encryption standard replaced the RC4 stream cipher and is considered "uncrackable"?
The Advanced Encryption Standard (AES).
What should you note in the wireless local area network (WLAN) site survey if a semidirectional antenna is required for adequate coverage?
The antenna orientation along with the antenna's side and back lobes for coverage and security reasons.
How does an antenna create gain in the received signal?
The antenna's shape focuses the received signal into a tighter beam
What value does the profile configuration utility in a wireless client device provide the user?
The user can configure profiles for each wireless network during the initial configuration of the client device instead of manually reconfiguring all of a wireless client's settings each time the user changes networks
When a wireless bridge is configured in repeater mode, the range of the wireless segment can be extended at the expense of which of the following?
Throughput
What does the "on with threshold" setting of the Request to Send/Clear to Send (RTS/CTS) protocol allow the wireless local area network (WLAN) administrator to control?
To control which frames over a certain size are announced and cleared to send by the stations.
What three levels of security does virtual private network (VPN) technology provide in a wireless local area network (LAN)?
User authentication, data encryption, and data authentication
Why are wireless local area networks (WLAN) usually deployed in an access capacity instead of as the network's core layer?
WLANs are generally incapable of meeting the requirements of the network core layer, which needs to be very fast and stable, able to handle a tremendous amount of traffic with little difficulty, and must experience no down time.
What is a symptom of a high voltage standing wave radio (VSWR) in a radio transmitter?
high voltage standing wave radio
