CompTIA JK0-019 Online Practice Questions and Exam Preparation

CompTIA JK0-019 Online Questions & Answers

• Question 521:

  A technician has two wireless 802.11g APs. One is set to channel 1 and the other channel

  6. The APs appear to interfere with each other. Which of the following is MOST likely the reason?

  A. Channels below 9 overlap each other
  B. Channel width is set to 40MHz
  C. Channels are in the 5GHz range by mistake
  D. Channel 1 should have been set to 11 to avoid an overlap
  B. Channel width is set to 40MHz

• Question 522:

  Which of the following is the MAXIMUM data transmission rate of 802.11a?

  A. 8Mbps
  B. 11Mbps
  C. 54Mbps
  D. 107Mbps
  C. 54Mbps

• Question 523:

  The network administrator installed a new dipole antenna that extends 100 feet (30.48 meters) from the existing AP. All components are correct, functional, and installed properly. However, during validation, there is a very weak signal coming from the antenna.

  Which of the following is the MOST likely cause of the issue?

  A. The installation exceeds the link limitations
  B. The antenna is mounted for vertical polarization
  C. The dBi output of the antenna is too low
  D. The radio is too powerful for the installation
  A. The installation exceeds the link limitations

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  Unlike isotropic antennas, dipole antennas are real antennas. Dipole antennas have a different radiation pattern compared to isotropic antennas. The dipole radiation pattern is 360 degrees in the horizontal plane and 75 degrees in the vertical plane (assuming the dipole antenna is standing vertically) and resembles a donut in shape. Because the beam is "slightly" concentrated, dipole antennas have a gain over isotropic antennas of 2.14 dB in the horizontal plane. Dipole antennas are said to have a gain of 2.14 dBi (in comparison to an isotropic antenna).

• Question 524:

  Which of the following can a technician use when a company implements redundant WAN links?

  A. Content filter
  B. Load balancer
  C. Proxy server
  D. VPN concentrator
  B. Load balancer

• Question 525:

  A company pays a third-party vendor a monthly fee to connect to offsite servers and desktops. Users connect to the desktops via RDP, and administrators connect to the servers via VPN. Servers and desktops are hardware-based. Which of the following is the third-party providing?

  A. Virtual desktops
  B. Virtual servers
  C. NaaS
  D. SaaS
  C. NaaS

• Question 526:

  A malicious user connects to an open wireless network and is able to copy, reassemble and play back live VoIP data streams from wireless VoIP users. Which of the following attacks has the user performed?

  A. Man-in-the-middle
  B. Evil Twin
  C. Packet Sniffing
  D. IV attack
  C. Packet Sniffing

• Question 527:

  Which of the following is the only standard that can operate at either frequency?

  A. 802.11a
  B. 802.11b
  C. 802.11g
  D. 802.11n
  D. 802.11n

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  Only 802.11n can operate at 2.4 Ghz and 5Ghz

• Question 528:

  If a technician does not assign an IP address to a device, the DHCP server will assign the device a:

  A. static IP address.
  B. reservation.
  C. dynamic IP address.
  D. MAC address.
  C. dynamic IP address.

• Question 529:

  A technician installs a new CAT6 cable from one end of the office building to another, a total distance of 600 feet (182.88 meters). When a laptop is connected to the cable, it cannot connect to the Internet. Which of the following is MOST likely the cause of this problem?

  A. Bad connectors
  B. Crosstalk
  C. DB loss
  D. TXRX reversed
  C. DB loss

• Question 530:

  Which of the following network topologies describes a network where each node is connected to multiple devices?

  A. Mesh
  B. Bus
  C. Star
  D. Ring
  A. Mesh