CompTIA JK0-019 Online Practice Questions and Exam Preparation

CompTIA JK0-019 Online Questions & Answers

• Question 451:

  Which of the following DHCP properties defines the size of the pool of available IP addresses?

  A. Options
  B. Scope
  C. Leases
  D. Reservations
  B. Scope

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  A range of IP addresses that are available to be leased to DHCP clients by the DHCP Server service.

• Question 452:

  A computer has lost network connectivity. The network technician determines the network cable and the cable drop are both good. Which of the following would the technician use to test the computer's NIC?

  A. Cable certifier
  B. Throughput tester
  C. Loopback plug
  D. Multimeter
  C. Loopback plug

• Question 453:

  Which of the following is a packet switching WAN technology?

  A. Frame relay
  B. T1
  C. Asynchronous transfer mode
  D. ISDN
  A. Frame relay

• Question 454:

  Which of the following wireless standards has a maximum rate of less than 50 Mbps?

  A. 802.11a
  B. 802.11b
  C. 802.11g
  D. 802.11n
  B. 802.11b

• Question 455:

  Which of the following protocols is used to send time synchronization updates on a given network?

  A. NTP
  B. POP3
  C. DNS
  D. IMAP
  A. NTP

• Question 456:

  Discover, Offer, Request, and Acknowledge are the steps for which of the following protocols?

  A. DNS
  B. DOS
  C. DHCP
  D. DSL
  C. DHCP

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  when we install a dhcp server into our network then dhcp server works on the basis of dora process first dhcp server sends a hello message in to the network to discover the clients pc and when any client pc found in the network then, dhcp server offers the IP to client pc. When client pc selects any IP from dhcp server then client pc request for selected IP to dhcp server then dhcp server provide that IP to client pc and both send ackonledgement to each other.

• Question 457:

  A technician replaces a failed router in an office with the same model unit using the default settings. After the installation, the technician reboots all of the PCs and servers. Upon reboot some of the PCs are receiving IP addresses on the same subnet as the new router; other PCs are receiving addresses on the same subnet as the servers. Which of the following most likely describes the issue?

  A. The DHCP lease pool was not large enough
  B. DHCP lease times were set too low
  C. The router is not the only DHCP server
  D. DHCP was not enabled on the replacement router
  C. The router is not the only DHCP server

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  This happens when there are multiple DHCP servers in the same LAN subnet. Here some machines are getting ip address from the router while some are getting ip address from another DHCP server present in the same domain.

• Question 458:

  Which of the following is needed when using WPA2-Enterprise wireless encryption?

  A. TFTP
  B. RADIUS
  C. LDAP
  D. IPSec
  B. RADIUS

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  The WPA2 standard supports two different authentication mechanisms: one using standard RADIUS servers and the other with a shared key, similar to how WEP works.

• Question 459:

  A technician needs multiple networks, high speeds, and redundancy on a system. Which of the following configurations should be considered for these requirements? (Select TWO).

  A. Routing table
  B. Next hop
  C. Port mirroring
  D. Port monitoring
  E. VLANs
  C. Port mirroring
  E. VLANs

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  Port mirroring is used on a network switch to send a copy of network packets seen on one switch port (or an entire VLAN) to a network monitoring connection on another switch port. This is commonly used for network appliances that require monitoring of network traffic, such as an intrusion detection system, passive probe or real user monitoring (RUM) technology that is used to support application performance management (APM).

  In computer networking, a single layer-2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them via one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN or VLAN.

• Question 460:

  Which of the following would allow a network administrator to implement a user authentication method that uses X.509 certificates?

  A. PKI
  B. Kerberos
  C. TACACS+
  D. RADIUS
  A. PKI