CompTIA JK0-019 Online Practice Questions and Exam Preparation

CompTIA JK0-019 Online Questions & Answers

• Question 801:

  Which of the following technologies can cause interference for 802.11g?

  A. RADAR
  B. 802.11a
  C. IrDA
  D. Bluetooth
  D. Bluetooth

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  This wireless communication standard has a maximum transmission speed of 54 Mbits per second and a typical indoor range of 30 meters. It uses the 2.4 GHz band. This band may have to deal with interference from cordless telephones, Bluetooth devices, and various appliances.

• Question 802:

  Which of the following uses a 128-bit addressing scheme?

  A. MAC
  B. DHCP
  C. IPv4
  D. IPv6
  D. IPv6

• Question 803:

  When troubleshooting a connectivity issue, which of the following commands will give the technician a list of the host names connected to the network?

  A. ping
  B. nbtstat
  C. arp
  D. msconfig
  B. nbtstat

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  The Nbtstat command is a great command to use when you need to display the NetBIOS over TCP/IP protocol statistics. The Nbtstat command can also be used to display NetBIOS name tables for both local and remote computers.

• Question 804:

  Which of the following is the BEST way to prevent new users from connecting to a wireless access point, but still allow already connected users to continue to connect?

  A. Create a MAC filter containing the current users.
  B. Turn off SSID broadcast.
  C. Change the encryption type to AES 256-bit for current users.
  D. Reduce the signal strength to 0 percent.
  A. Create a MAC filter containing the current users.

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  MAC Filtering (or EUI filtering, or layer 2 address filtering) refers to a security access control method whereby the 48-bit address assigned to each network card is used to determine access to the network.

  MAC addresses are uniquely assigned to each card, so using MAC filtering on a network permits and denies network access to specific devices through the use of blacklists and whitelists. While the restriction of network access through the use of lists is straightforward, an individual person is not identified by a MAC address, rather a device only, so an authorized person will need to have a whitelist entry for each device that he or she would use to access the network.

• Question 805:

  A network technician is trying to run a protocol analyzer and is instructed to record the chimney offload state of TCP. Which of the following utilities did the technician use to check this parameter with the output listed below?

  Querying active state...

  TCP Global Parameters

  Receive-Side Scaling State : enabled

  Chimney Offload State : disabled

  Receive Window Auto-Tuning Level : normal

  Add-On Congestion Control Provider : ctcp

  ECN Capability : disabled

  RFC 1323 Timestamps : disabled

  A. net
  B. netstat
  C. nbtstat
  D. netsh
  D. netsh

• Question 806:

  Users report that they are unable to access the production server with IP address 192.168.30.17. These users need to be provided access without changing any subnet to VLAN information. The VLANs configured on the network are listed below:

  DepartmentVLAN #Subnet used

  Marketing20192.168.20.0/28

  Customer Service25192.168.20.64/28

  Finance30192.168.30.0/28

  WHSE35192.168.30.16/28 Sales40192.168.3.16/28

  The users experiencing this issue need to be added to which of the following VLANs?

  A. 25
  B. 30
  C. 35
  D. 40
  C. 35

• Question 807:

  A user is having difficulty connecting a laptop to the company's network via a wireless connection. The user can connect to the network via a wired NIC. The technician suspects the laptop's wireless NIC has failed. The technician performs hardware diagnostics on the wireless NIC and discovers the hardware is working fine. Which of the following network troubleshooting methodology steps should the technician do NEXT?

  A. Establish a plan of action to resolve the problem.
  B. Test the theory to determine a cause.
  C. Re-establish a new theory or escalate.
  D. Implement the solution or escalate as necessary.
  C. Re-establish a new theory or escalate.

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  As first theorey doesn't work he will establish a new theorey or escalate it to the vendor hardware company to work on it.

• Question 808:

  A network administrator needs to implement a monitoring tool and be able to send log information to a server and receive log information from other clients. Which of the following should be implemented? (Select TWO).

  A. SNMP
  B. Network sniffer
  C. Syslog
  D. System log
  E. History log
  A. SNMP
  C. Syslog

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  Simple Network Management Protocol (SNMP) is an "Internet-standard protocol for managing devices on IP networks". Devices that typically support SNMP include routers, switches, servers, workstations, printers, modem racks and more. It is used mostly in network management systems to monitor network-attached devices for conditions that warrant administrative attention.

  Syslog is a standard for computer message logging. It permits separation of the software that generates messages from the system that stores them and the software that reports and analyzes them.

• Question 809:

  A technician is troubleshooting a network connectivity issue on a laptop. The technician wants to verify the NIC is functioning on the laptop. Which of the following commands should the technician use?

  A. ping 127.0.0.1
  B. ping 169.254.0.1
  C. tracert 192.168.0.1
  D. nslookup 10.4.0.1
  A. ping 127.0.0.1

• Question 810:

  The network support team is constantly getting calls from users in a specific area of an office building. The users are able to connect to the office wireless network, but they sometimes disconnect or experience very slow download speeds. Which of the following is MOST likely the problem?

  A. Incorrect service set identifier
  B. Low signal strength or interference
  C. Incorrect encryption scheme
  D. Incorrect IP address or subnet mask
  B. Low signal strength or interference

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  This generally happens when the signals are weak in any particular area and any movement can make you lose connectivity to the internet. In this case you can try to increase the radio power so that the signal strength can be increased.