CompTIA JK0-019 Online Practice Questions and Exam Preparation

CompTIA JK0-019 Online Questions & Answers

• Question 161:

  A technician sets up a network with multiple WAN connections, backup power sources, multiple firewalls, and a mesh configuration for network switching. All of the software and hardware has fault detection designed to provide a system with minimal down time. Which of the following is the BEST example of this optimization method?

  A. Load balancing
  B. High availability
  C. Caching engines
  D. Quality of Service
  B. High availability

• Question 162:

  Which of the following would be used to check whether a DoS attack is taking place from a specific remote subnet?

  A. Syslog files
  B. Honeypot
  C. Network sniffer
  D. tracert
  C. Network sniffer

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  A network sniffers monitors data flowing over computer network links. It can be a self-contained software program or a hardware device with the appropriate software or firmware programming.

• Question 163:

  Which of the following IP address/subnet mask combinations represent a broadcast address? (Select TWO).

  A. 200.200.100.0/28
  B. 200.200.100.32/27
  C. 200.200.100.63/27
  D. 200.200.100.79/27
  E. 200.200.100.95/27
  F. 200.200.100.254/30
  C. 200.200.100.63/27
  E. 200.200.100.95/27

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  A broadcast address is a logical address at which all devices connected to a multiple- access communications network are enabled to receive datagrams. A message sent to a broadcast address is typically received by all network-attached hosts, rather than by a specific host. ReferencE. http://www.wikihow.com/Calculate-Network-and-Broadcast-Address

• Question 164:

  The network technician is working in an office that has both VoIP telephone lines and analog lines. A user states that the fax machine is not sending or receiving faxes. The network technician determines that the fax machine uses an analog phone line. Which of the following tools would the technician use to troubleshoot the issue?

  A. Cable tester
  B. Buttset
  C. Toner probe
  D. Cable certifier
  B. Buttset

• Question 165:

  Which of the following can a network technician change to help limit war driving?

  A. Signal strength
  B. SSID
  C. Frequency
  D. Channel
  A. Signal strength

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  War driving is a term used to describe the process of a hacker who, armed with a laptop and a wireless adapter card and traveling via a car, bus, subway train, or other form of mechanized transport, goes around sniffing for WLANs. Over time, the hacker builds up a database comprising the network name, signal strength, location, and ip/namespace in use..

• Question 166:

  Users have reported issues accessing an Internet website. The network technician wants to verify network layer connectivity. Which of the following tools can provide the verification?

  A. ping
  B. netstat
  C. route
  D. arp
  A. ping

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  Ping is a computer network administration utility used to test the reachability of a host on an Internet Protocol (IP) network and to measure the round-trip time for messages sent from the originating host to a destination computer.

• Question 167:

  802.11n can operate at which of the following frequencies? (Select TWO).

  A. 2.4Mhz
  B. 2.5Mhz
  C. 5Mhz
  D. 2.4Ghz
  E. 2.5Ghz
  F. 5Ghz
  D. 2.4Ghz
  F. 5Ghz

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  802.11n is an amendment which improves upon the previous 802.11 standards by adding multiple-input multiple-output antennas (MIMO). 802.11n operates on both the 2.4 GHz and the lesser used 5 GHz bands

• Question 168:

  Which of the following can be used to compromise a WPA encrypted wireless network when the rainbow table does not contain the key?

  A. Evil twin
  B. War chalking
  C. Buffer overflow
  D. Virus
  A. Evil twin

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  An evil twin is the wireless version of the phishing scam. An attacker fools wireless users into connecting a laptop or mobile phone to a tainted hotspot by posing as a legitimate provider.This type of evil twin attack may be used to steal the passwords of unsuspecting users by either snooping the communication link or by phishing, which involves setting up a fraudulent web site and luring people there.

• Question 169:

  Which of the following can MOST likely cause intermittent connection problems with a CAT5 network cable?

  A. Cable has been looped too many times.
  B. Cable has a twist tie attached too close to the connector.
  C. Cable is too warm.
  D. Cable is run too close to a fluorescent light.
  D. Cable is run too close to a fluorescent light.

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  Cat 5 is a twisted pair cable for carrying signals. This type of cable is used in structured cabling for computer networks such as Ethernet. The cable standard provides performance of up to 100 MHz and is suitable for 10BASE-T, 100BASE-TX (Fast Ethernet), and 1000BASE-T (Gigabit Ethernet).

• Question 170:

  A network administrator is performing a penetration test on the WPA2 wireless network. Which of the following can be used to find the key?

  A. DoS
  B. Buffer overflow
  C. Dictionary file
  D. SQL injection
  C. Dictionary file

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  A file used by the debugger. It contains information about a program's structure and contents. The Compiler creates the dictionary file in the first phase of compilation, when checking the syntax. A dictionary file has the filename extension .idy, and is often referred to an .idy file.