CompTIA JK0-019 Online Practice Questions and Exam Preparation

CompTIA JK0-019 Online Questions & Answers

• Question 151:

  A network technician visits a site that needs voice connectivity to the corporate office and installs four IP phones. The phone exchange resides at the telephone company. Which of the following technologies is being used?

  A. Virtual switch
  B. Virtual server
  C. Virtual desktop
  D. Virtual PBX
  D. Virtual PBX

• Question 152:

  Which of the following TCP ports are used by FTP? (Select TWO).

  A. 20
  B. 21
  C. 22
  D. 23
  E. 25
  F. 80
  A. 20
  B. 21

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  FTP uses two ports by default: 21 for sending commands, and 20 for sending data. For instance if you said "FTP " it would make the attempt using port 21. If the session was established, port 20 would be using for the data. NotE. These are the default ports which is what I assume you were asking. A server administrator can however configure FTP to use whatever port he defines.

• Question 153:

  Which of the following do 802.11 networks use to handle packet collisions from multiple nodes?

  A. CSMA/CA
  B. CSU/DSU
  C. Ethernet Tokens
  D. CSMA/CD
  A. CSMA/CA

• Question 154:

  A technician wants to configure multiple switches to support all of the corporate VLANs. Which of the following will allow configuration of the switches and have the information propagate automatically to the other switches?

  A. FTP server
  B. VTP server
  C. Virtual PBX
  D. NTP server
  B. VTP server

• Question 155:

  Ann, a client, shares half of a rectangular floor plan with another company and wishes to set up a secure wireless network. The installed antenna limits the signal to her half of the floor. Through analysis, the frequency and channels of surrounding wireless networks have been determined and configuration changes made accordingly. Which of the following would be the NEXT step in setting up this secure wireless network?

  A. Decrease signal strength on the antenna
  B. Change the wireless channel on the WAP
  C. Change the device placement to further obfuscate the signal
  D. Set up encryption on the WAP and clients
  D. Set up encryption on the WAP and clients

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  The encryption will help the clients and server to uniquely identify themselves in an interfering environment.

• Question 156:

  Which of the following TCP/IP model layers does the OSI model Data Link layer map to?

  A. Application
  B. Transport
  C. Internet
  D. Network Interface
  D. Network Interface

• Question 157:

  Which of the following properties of DHCP would a technician use to ensure an IP address is not leased out from the active scope?

  A. Reservations
  B. Lease times
  C. Removing IPs from the active leases
  D. Configuring the DNS options
  A. Reservations

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  Reservations are permanent lease assignments that are used to ensure that a specified client on a subnet can always use the same IP address. You can use DHCP reservations for hosts that require a consistent IP address, but do not need to be statically configured.

• Question 158:

  There has been an increase in Help Desk tickets related to web portal user accounts being locked out. Which of the following resources would be used to analyze the issue?

  A. Router logs
  B. Protocol analyzer
  C. Firewall logs
  D. Application logs
  D. Application logs

• Question 159:

  Which of the following network protocols is used to transport email across the Internet?

  A. NTP
  B. SSH
  C. SMTP
  D. SNMP
  C. SMTP

• Question 160:

  At which of the following layers of the OSI model does ASCII work?

  A. Session
  B. Transport
  C. Presentation
  D. Application
  C. Presentation

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  The presentation layer is responsible for the delivery and formatting of information to the application layer for further processing or display. It relieves the application layer of concern regarding syntactical differences in data representation within the end-user systems. An example of a presentation service would be the conversion of an EBCDIC- coded text computer file to an ASCII-coded file.