CompTIA JK0-019 Online Practice Questions and Exam Preparation

CompTIA JK0-019 Online Questions & Answers

• Question 401:

  If a NIC does not have a link light, there is a failure at which of the following OSI layers?

  A. Physical
  B. Session
  C. Data link
  D. Presentation
  A. Physical

  ---

  The NIC does not have light refers to a situation that there could be a fault in the LAN cable or the ports are down and all of these fall under the physical layer. To make it simple, it falls in physical layer because blinking lights refers to the physical connectivity.

• Question 402:

  An administrator wants to restrict traffic to FTP sites regardless of which PC the request comes from. Which of the following would BEST accomplish this?

  A. An IP filtering ACL
  B. A MAC filtering ACL
  C. A port filtering ACL
  D. A class matching ACL
  C. A port filtering ACL

• Question 403:

  Network upgrades have been completed and the WINS server was shutdown. It was decided that NetBIOS network traffic will no longer be permitted. Which of the following will accomplish this objective?

  A. Content filtering
  B. Port filtering
  C. MAC filtering
  D. IP filtering
  B. Port filtering

  ---

  TCP/IP port filtering is the practice of selectively enabling or disabling Transmission Control Protocol (TCP) ports and User Datagram Protocol (UDP) ports on computers or network devices. When used in conjunction with other security practices, such as deploying firewall software at your Internet access point, applying port filters to intranet and Internet servers insulates those servers from many TCP/IP-based security attacks, including internal attacks by malicious users.

• Question 404:

  A technician has noticed that the RJ-45 connector on the end of a user's patch cable was stripped too far back from the connector allowing for cross talk. Which of the following tools would a technician use to attach a new connector to eliminate this issue?

  A. Crimper
  B. Cable certifier
  C. Loopback plug
  D. Punch down tool
  A. Crimper

• Question 405:

  A technician installs a wireless router on an existing network by connecting it directly to the firewall. By default, the main network is a Class A network, while the wireless network is a Class C network. After the wireless router is installed, users connected to the wireless network report they are unable to connect to the Internet. Which of the following needs to be configured to BEST resolve this issue?

  A. Configure the main network to Class C
  B. Allow for duplicate IP addresses
  C. Allow the main network to handle DHCP
  D. Create a spanning tree to prevent switching loops
  C. Allow the main network to handle DHCP

• Question 406:

  Given a subnet mask of 255.255.255.0, how many usable IP addresses would be in that subnet?

  A. 250
  B. 254
  C. 255
  D. 256
  B. 254

  ---

  The Subnet Mask however, determines the "class" of a Network. 255.255.255.0 is a "Class C" network.A class c network can host up to 254 pc's

• Question 407:

  A network administrator is deploying a new wireless network with over 50 thin WAPs and needs to ensure all WAPs use consistent firmware and settings. Which of the following methods provides this functionality?

  A. Use WAP auto-configuration
  B. Use a wireless controller
  C. Use PXE to load and track WAPs
  D. Use DHCP scope options
  B. Use a wireless controller

  ---

  A wireless controller is used in combination with the Lightweight Access Point Protocol (LWAPP) to manage light-weight access points in large quantities by the network administrator or network operations center. The wireless LAN controller is part of the Data Plane within the Cisco Wireless Model. The WLAN controller automatically handles the configuration of anywhere from 6 to 6000 wireless access-points, depending on the model.

• Question 408:

  Which of the following switch features allows for both incoming and outgoing data across physical ports at the same time?

  A. Burst-frame
  B. Full-duplex
  C. Half-duplex
  D. VoIP
  B. Full-duplex

  ---

  A full-duplex (FDX), or sometimes double-duplex system, allows communication in both directions, and, unlike half-duplex, allows this to happen simultaneously. Land-line telephone networks are full-duplex, since they allow both callers to speak and be heard at the same time

• Question 409:

  A customer wants to keep cost to a minimum and has only ordered a single static IP address from the ISP. Which of the following must be configured on the router to allow for all the computers to share the same public IP address?

  A. VLANs
  B. PoE
  C. PAT
  D. VPN
  C. PAT

  ---

  Port Address Translation (PAT), is an extension to network address translation (NAT) that permits multiple devices on a local area network (LAN) to be mapped to a single public IP address. The goal of PAT is to conserve IP addresses.

• Question 410:

  Ann, a home user, wishes to confine a wireless network to devices ONLY inside of her house. Which of the following will accomplish this?

  A. Decreasing radio strength
  B. MAC filtering
  C. WEP encryption
  D. SSID broadcast disable
  A. Decreasing radio strength

  ---

  Decreasing Radio Strength will reduce signal strength outside the house and will accomplish what she is intending to do.