CompTIA JK0-019 Online Practice Questions and Exam Preparation

CompTIA JK0-019 Online Questions & Answers

• Question 421:

  Which of the following OSI model layers is used to order packets which may have arrived out of order?

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

• Question 422:

  Which of the following commands can a network technician use to check whether the DNS server for a given domain is reachable?

  A. nmap
  B. nbtstat
  C. dig
  D. arp
  C. dig

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  The command dig is a tool for querying DNS nameservers for information about host addresses, mail exchanges, nameservers, and related information. This tool can be used from any Linux (Unix) or Macintosh OS X operating system. The most typical use of dig is to simply query a single host.

• Question 423:

  Which of the following TCP/IP model layers combines four OSI model layers?

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

• Question 424:

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

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

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  The Application layer provides applications the ability to access the services of the other layers and defines the protocols that applications use to exchange data. There are many Application layer protocols and new protocols are always being developed.

• Question 425:

  Which of the following is the minimum subnet mask to allow 172.16.1.5 and 172.16.4.3 to be on the same subnet?

  A. /19
  B. /21
  C. /22
  D. /24
  B. /21

• Question 426:

  Which of the following is a link state routing protocol?

  A. RIPv2
  B. BGP
  C. IS-IS
  D. RIP
  C. IS-IS

• Question 427:

  A technician needs to install a new wireless encryption system. They are evaluating the feasibility of implementing WPA. WPA increases protection over WEP by implementing which of the following?

  A. Strong RC4 encryption
  B. Shared secret keys
  C. AES encryption
  D. Key rotation
  D. Key rotation

• Question 428:

  Which of the following characteristics allows an 802.11g WAP to have transfer speeds up to 108Mbps?

  A. MIMO technology
  B. Channel bonding
  C. Encryption type
  D. Frequency
  B. Channel bonding

• Question 429:

  Which of the following supports faster wireless broadband speeds?

  A. Satellite
  B. Wi-MAX
  C. ISDN
  D. OC-3
  B. Wi-MAX

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  Wi-MAX (Worldwide Interoperability for Microwave Access) is a wireless communications standard designed to provide 30 to 40 megabit-per-second data rates with the 2011 update providing up to 1 G bit/s for fixed stations

• Question 430:

  When installing new WAPs in a small office, which of the following is the BEST way to physically mitigate the threats from war driving?

  A. Implement multiple wireless encryption techniques.
  B. Implement PoE on each WAP.
  C. Decrease signal strength.
  D. Increase signal strength.
  C. Decrease signal strength.