Test 3 MC Questions

What is a fiber distribution panel, and how is it used?

A fiber distribution panel (FDP) is a device on a rack that allows fiber optic cables to converge, connect to each other, and connect to fiber optic equipment that connects to a network's ISP (Internet service provider) - an FDP is used to join two separate segments of a network that are using different forms of fiber optic cables, such as SMF (single mode fiber) and MMF (multi mode fiber).

What is the hidden node problem, and how can it be mitigated?

A hidden node problem is a problem in which a node is physically too far away from another node such that the two nodes cannot collaborate on collision prevention, or a situation in which a node is physically too far away from an access point's coverage area such that it cannot check for collisions when sending transmissons to it. - this can be mitigated with RTS/CTS (request to send/clear to send). This is an exchange in which the source node specifically requests to exchange information with an access point and the access point responds with an acknowledgment and grants permission for the source node to communicate with it. During this time the access point will not listen for any other nodes on a network until the source node has finished communicating with it.

A Fast Ethernet connection utilizes what pins on an RJ-45 plug? a. 1, 2, 3, 6 b. 1, 2, 3, 5 c. 1, 2, 7, 8 d. 1, 2, 4, 5

a. 1, 2, 3, 6

Near-field communication devices send data at what fixed frequency? a. 13.56 MHz b. 21.39 MHz c. 47.1 MHz d. 8.65 MHz

a. 13.56 MHz

When troubleshooting wireless issues, what statement is accurate? a. Access points that use overlapping channels can cause interference with each other if they are too close. b. Access point power levels should always be configured to output as much power as possible. c. A WPA key can be used to associate with a WEP configured access point. d. Simultaneous wired and wireless network connections do not affect the ability to communicate on the network.

a. Access points that use overlapping channels can cause interference with each other if they are too close.

What is the minimum category of UTP cable required in order to support Gigabit speeds? a. Cat 5e b. Cat 5 c. Cat 3 d. Cat 6

a. Cat 5e

Noise can degrade or distort a signal on a network; what are some of its causes?

- EMI (electromagnetic interference): this is a form of noise caused by electrical appliances such as washing machines, microwaves, and motors, it primarily affects wired networks. - RFI (radio frequency interference): this is a form of EMI and noise caused by radio frequency transmissions such as radio broadcast waves of satellite TV signals, and it primarily affects wireless networks. - crosstalk: a form of noise in which the signal being sent along a wire or cable interferes with the signal being sent along an adjacent wire or cable. There are three different types of crosstalk: - alien crosstalk: occurs when two signals being sent on two different cables interferes with each other's own signals. - NEXT (near end crosstalk): a form of crosstalk that occurs near the source of the signal along a wire or cable. - FEXT (far end crosstalk): a form of crosstalk that occurs on the opposite side of the source of the signal along a wire or cable.

What is the difference between single mode fiber and multimode fiber, and how do they compare?

- Single mode fiber (SMF) is a fiber optic cable that has a more narrow core that sends only one pulse of light in one direction from the source to its destination. SMF provides the highest bandwidth of any transmission medium and is used on the backbone of the Internet due to how incredibly far SMF signals can be sent. However, it is extremely expensive to use and install SMF. - Multi mode fiber (MMF) is a fiber optic cable with a wider core that sends multiple pulses of light that travel in different directions from the source to its destination. MMF also provides excellent bandwidth, but because it sends multiple pulses of light it can only send signals over short distances, making it a good choice for connecting devices and networking equipment to network backbones. MMF is also much more affordable than SMF which makes it more commonly used.

Radiation patterns can be used to classify antennas into what two basic categories?

- unidirectional antennas: Antennas that broadcast a signal in one specific direction. - omni-directional antenna: An antenna that broadcasts a signal with equal strength and distance in all directions.

What are some of the different types of wireless topologies that can be created?

Ad hoc: a wireless topology in which nodes are connected to each in close proximity, face each other, and there is no connectivity device or access point used. Infrastructure: a wireless topology in which a connectivity device such as a wireless access point or access point provides network access and connectivity to the nodes in a network. Mesh: a wireless topology in which multiple wireless access points or access points are used together for fault tolerance and redundancy in a network and to grant nodes connectivity and network access.

When deciding antenna types, why might the use of an omnidirectional antenna be inadvisable?

An omni-directional antenna might be inadvisable if you want to be able to direct the Wi-Fi signal to a more specific area. Since an omni-directional antenna broadcasts a signal in every direction, some of the antenna's coverage area will not be of use to clients using the Wi-Fi network. For example, if you were to install an access point with an omni-directional antenna in a highly elevated location, much of the signal would be inaccessible by clients since some of the signal would be sent up into the ceiling or the sky. On the other hand, if you used a unidirectional antenna for the same installation, you could direct the antenna's signal such that your clients could utilize the maximum amount of signal from the antenna.

What is the biggest limiting factor on fiber-optic cable length?

The biggest limiting factor on fiber optic cable length is optical loss, which is the degredation of a light signal as it travels further away from the light source.

When using RFID, what is an ARPT (Active Reader Passive Tag)? a. It is a tag that is activated by an active reader, and uses power from the reader's radio to power its transmission. b. It is a tag that requires an active reader, but still contains a battery in the tag. c. It is a battery-powered tag actively transmits its credentials at regular time intervals, which can be read remotely. d. It is a tag that can be read remotely up to a distance of 50 m, but requires a powerful active reader.

a. It is a tag that is activated by an active reader, and uses power from the reader's radio to power its transmission.

You have been awarded a contract for wiring a new federal building. What twisted-pair wiring standard must you use? a. TIA/EIA 568A b. TIA/EIA 568B c. TIA/EIA rollover d. TIA/EIA 568F

a. TIA/EIA 568A

A junior administrator is having issues connecting to a router's console port using a TIA/EIA 568B standard cable and a USB serial to RJ-45 adapter, despite verifying terminal settings. What is the issue? a. The cable must be a rollover cable. b. The USB standard is incompatible with the serial connection used by the console port. c. Router console ports are only used when connected to other routers. d. The router console port is providing an Ethernet connection, instead of a serial connection.

a. The cable must be a rollover cable.

Upon connecting to a Wi-Fi network, you're redirected to a login screen and a request to accept terms of service before being connected. What is this an example of? a. captive portal b. browser hijacking c. WPA2-Enterprise d. guest network profile

a. captive portal

The use of multiple antennas on an access point to issue a signal to one or more receivers is enabled by what 802.11 innovation? a. multiple input-multiple output (MIMO) b. channel bonding c. spread spectrum frequency hopping d. frame aggregation

a. multiple input-multiple output (MIMO)

How does refraction affect the propagation of a wireless transmission? a. It causes the signal to be returned back towards the source of the origin. b. It distorts the signal as it travels into and through a different transmission medium. c. It causes the signal to be absorbed by the refracting material. d. It splits the signal into secondary waves that continue in the direction in which they split.

b. It distorts the signal as it travels into and through a different transmission medium.

At what layer of the OSI model do the 802.11 standards vary? a. Data link layer b. Physical layer c. Transport layer d. Network layer

b. Physical layer

Diffraction has what affect on a wireless signal's propagation? a. The signal is redirected into multiple directions. b. The signal is split into secondary waves that continue in the direction in which they split. c. The signal is returned back towards the source of the original signal. d. The signal is completely absorbed by the diffracting material.

b. The signal is split into secondary waves that continue in the direction in which they split.

Telephone connections follow what registered jack standard? a. registered jack 100 (RJ-100) b. registered jack 11 (RJ-11) c. registered jack 12 (RJ-12) d. registered jack 45 (RJ-45)

b. registered jack 11 (RJ-11)

What type of device can be used to assess the quality of a wireless signal? a. frequency hopper b. spectrum analyzer c. Wi-Fi analyzer d. channel scanner

b. spectrum analyzer

How many data streams are used in 802.11ac Wave 2 devices? a. 3 data streams b. 2 data streams c. 4 data streams d. 8 data streams

c. 4 data streams

Which of the following statements regarding the 802.11ac standard is NOT accurate? a. 802.11ac operates on the 5-GHz band. b. 802.11ac access points can handle multiple transmissions at one time over the same frequency. c. 802.11ac access points function more like a hub than a switch. d. The standard was officially approved in early 2014.

c. 802.11ac access points function more like a hub than a switch.

What statement describes a transmission flaw that is occurring due to attenuation? a. Two network interfaces are experiencing problems at the same time due to the cables having adjacent runs. b. A customer's video conferencing application is experiencing delay in audio and video that comes and goes. c. A customer modem is continuously losing signal due to large distance from the transmitting device. d. A network switch interface is dropping due to a powerful radio transmitter in the adjacent room.

c. A customer modem is continuously losing signal due to large distance from the transmitting device.

What scenario describes an evil twin attack? a. An attacker is actively attempting to brute force the PIN of a WPS enabled access point. b. A hacker is actively sending wireless probes to discover available wireless networks. c. A malicious access point is configured with the SSID of a non-malicious public access point. d. A hacker is utilizing a protocol analyzer on a public Wi-Fi network to discover packet contents.

c. A malicious access point is configured with the SSID of a non-malicious public access point.

Why should you terminate coaxial cable with connectors that are rated for the exact cable type? a. A mismatched connector will work fine, but breaks cabling standards. b. A mismatched connector will not fit the coaxial cable for termination. c. A mismatched connector will have different impedance ratings, causing data errors. d. A mismatched connector will destroy the equipment it is connected to.

c. A mismatched connector will have different impedance ratings, causing data errors.

Which of the following statements about fiber-optic cabling is accurate? a. The maximum length for a fiber segment is 20km. b. Fiber-optic cabling has a low resistance to signal noise. c. Light experiences virtually no resistance when traveling through glass. d. Fiber-optic cable is cheaper than shielded twisted pair cabling.

c. Light experiences virtually no resistance when traveling through glass.

What kind of tool can you use to measure voltage on a cable length? a. light meter b. continuity tester c. multimeter d. time domain reflectometer

c. multimeter

Signals that can travel in only one direction on a medium are referred to as what type of signal? a. half-duplex b. duplex c. simplex d. full-duplex

c. simplex

What is the maximum supported throughput of a CAT6 cable? a. 1 Gbps b. 100 Mbps c. 100 Gbps d. 10 Gbps

d. 10 Gbps

When terminating an Ethernet cable, about how far should the cable sheath extend into the plug? a. 4/5 inch b. 1/2 inch c. 1/5 inch d. 3/8 inch

d. 3/8 inch

What statement correctly describes "jitter"? a. Jitter is the fluctuation of a signal's strength as it travels away from its source. b. Jitter is the transmission of signal onto unintended pairs in a copper cable. c. Jitter is the loss of 50% or more packets in a given data stream, causing a connection to falter. d. Jitter is what happens when packets experience varying amounts of delay and arrive out of order.

d. Jitter is what happens when packets experience varying amounts of delay and arrive out of order.

Which statement accurately describes what near end crosstalk (NEXT) is? a. NEXT is crosstalk that occurs only when a cable segment exceeds the bend radius. b. NEXT is crosstalk that occurs when an EMI source is near the data signal source. c. NEXT is crosstalk that occurs near the opposite end of a signal source. d. NEXT is crosstalk that occurs between wire pairs near the source of a signal.

d. NEXT is crosstalk that occurs between wire pairs near the source of a signal.

What optional protocol can be used in 802.11 to reserve the medium for one node's use? a. RAR/CTU (Reserve Airtime Request/Clear to Use) b. HA/RA (Hold Airtime/Reserved Airtime) c. RT/FT (Request Time/Fair Time) d. RTS/CTS (Request to Send/Clear to Send)

d. RTS/CTS (Request to Send/Clear to Send)

You are troubleshooting a client's wireless networking issue. Which of the following will prevent the client from connecting to the network? a. The client is using an 802.11n wireless adapter, but the access point only supports up to 802.11g. b. The client is only able to get line of sight with an omnidirectional antenna. c. The client is using a network adapter with outdated firmware. d. The client has a wireless profile configured for the "campus" SSID, but the access point is broadcasting the "CAMPUS" SSID.

d. The client has a wireless profile configured for the "campus" SSID, but the access point is broadcasting the "CAMPUS" SSID.

If you need to evaluate Wi-Fi network availability as well as optimize Wi-Fi signal settings and identify security threats, what tool should you use? a. protocol analyzer b. spectrum analyzer c. air scanner d. Wi-Fi analyzer

d. Wi-Fi analyzer

Noise that can degrade or distort a signal on a network is measured with what unit? a. joules b. volts c. farads d. decibels

d. decibels