CompTIA JK0-019 Online Practice Questions and Exam Preparation

CompTIA JK0-019 Online Questions & Answers

• Question 601:

  Which of the following technologies is used to connect public networks using POTS lines?

  A. OC3
  B. OC12
  C. PSTN
  D. Cable
  C. PSTN

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  The PSTN consists of telephone lines, fiber optic cables, microwave transmission links, cellular networks, communications satellites, and undersea telephone cables, all interconnected by switching centers, thus allowing any telephone in the world to communicate with any other

• Question 602:

  A network administrator opens up the RDP port to access network resources from home. Several months later, the administrator's account is getting locked out constantly. After closing the port, which of the following should be used to identify the source of the attack?

  A. Network maps
  B. Change management
  C. Log analysis
  D. Protocol analyzer
  C. Log analysis

• Question 603:

  Which of the following protocols is used to transfer files over the Internet?

  A. SNMP
  B. NTP
  C. FTP
  D. SIP
  C. FTP

• Question 604:

  A technician grabs a network cable and connects two switches together. However, the ports fail to come up as indicated by the link lights. Which of the following is MOST likely the issue?

  A. Wrong subnet mask on the interfaces
  B. Mismatched MTU size
  C. Straight through instead of cross over cable
  D. SSID mismatch between the switches
  C. Straight through instead of cross over cable

• Question 605:

  A Chief Executive Officer (CEO) decided that only a limited number of authorized company workstations will be able to connect to the Internet. Which of the following would BEST accomplish this goal?

  A. Use content filtering
  B. Install and configure IDS
  C. Enable MAC address filtering
  D. Enable RAS on the network firewall
  C. Enable MAC address filtering

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  Most Wi-Fi access points and routers ship with a feature called hardware or MAC address filtering. This feature is normally turned "off" by the manufacturer, because it requires a bit of effort to set up properly. However, to improve the security of your Wi-Fi LAN (WLAN), strongly consider enabling and using MAC address filtering.

• Question 606:

  Malicious users have used multiple workstations to target a single server with the intent of preventing legitimate users from accessing the server. This server suffered which of the following types of attack?

  A. DDoS
  B. Trojan
  C. Cross-site scripting
  D. Man in the middle
  E. Replay attack
  A. DDoS

• Question 607:

  A small office client is requesting a network redesign. Both wired and wireless devices must connect to the network. All of the wireless devices can communicate using the latest standards. The building has a long courtyard in the middle with reinforced walls, which extends up through all the floors. The distance from the switch to the furthest drop is 88 meters. Which of the following is the correct network redesign choice?

  A. Fiber optic cabling is necessary due to distance limitations.
  B. The wireless network should be 802.11b due to equipment limitations.
  C. One WAP will be sufficient to provide wireless coverage to the floor.
  D. The wired network should be run with at least CAT6 cabling.
  D. The wired network should be run with at least CAT6 cabling.

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  The Category 6 cable, also known as Cat-6, is backward compatible with the Category 5/5 e and Category 3 cable standards. It can create a high speed computer network and operate at an optimal performance if other components in the network are compatible with gigabit speeds. AdvantagE. Speed and Performance The cable can handle speed performance of up to 250 MHZ. This fast performance makes it possible to use with a fast ethernet network including Gigabit Ethernet and 10-Gigabit Ethernet. The whole generation of the Cat 6 cable was introduced to complement the Gigabit Ethernet which includes interface cards, patch panels, routers, switches, and other components which is developed to achieve a full gigabit network. Many IT professionals realized that the Cat 6 cable provide very fast network performance and can deliver gigabit speeds. AdvantagE. Similar Structure with Cat 5 Cable Cat 6 cable has a similar structure to the Cat 5 and Cat 5e. The Cat 6, Cat 5 and Cat 5e cables have 8 wires that are twisted together to form four pairs. The difference is that one pair of the wires in the Cat 6 cable is kept from contacting with others so that it can produce double the bandwidth of the Cat 5 and Cat 5e. AdvantagE. Backward Compatible The plug and port of the Cat 6 cable is the same as the Cat 5 and Cat 5e. Therefore, it can be plugged into any port or connection that supports both of those cables. If you use the Cat 5 port, it will not yield the full speed that it is capable of handling. Instead, it will operate at the speed of the computer or cable. However, the speed will be acceptable. AdvantagE. Upgradable If upgrading to a more optimal network, the Cat 6 cable should be included in part of the upgrade. The Cat 6 cable will not operate at the full speed if other units in the network does not support gigabit speeds. Small businesses that are starting should consider installing the Cat 6 cable since it is becoming the industry standard.

• Question 608:

  A customer's email server is not sending emails. Arrange the troubleshooting steps in the order the technician should perform them:

  Select and Place:

  

  

• Question 609:

  Which of the following is a specialized piece of hardware designed to encrypt and decrypt user traffic?

  A. Proxy server
  B. TDR
  C. Smart jack
  D. VPN concentrator
  D. VPN concentrator

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  The VPN Concentrator is used for Remote Access VPN's. In typical use, a Remote Access VPN allows users to use an encrypted tunnel to securely access a corporate or other network via the Internet.

• Question 610:

  Which of the following provides the STRONGEST security for a tunneled connection over the Internet?

  A. RDP
  B. SMTP
  C. RAS
  D. IPSec
  D. IPSec