Juniper JN0-643 Online Practice Questions and Exam Preparation

Juniper JN0-643 Online Questions & Answers

• Question 71:

  -- Exhibit

  

  -- Exhibit -

  Click the Exhibit button.

  Referring to the exhibit, USER1 wants to only receive multicast traffic for group 225.0.0.1 and USER2 wants to only receive multicast traffic for group 225.0.0.2. Both users are connected to an EX Series switch and are receiving unwanted multicast traffic.

  What will resolve the problem?

  A. Create IGMP static groups with the exclude parameter.
  B. Enable the IGMP immediate-leave parameter.
  C. Use PIM sparse mode instead of PIM dense mode.
  D. Enable IGMP snooping.
  D. Enable IGMP snooping.

• Question 72:

  Which statement is correct about the MSTP?

  A. MSTP enables mapping multiple independent spanning tree instances onto one physical.topology
  B. MSTP enables dynamic discover or Iayer2 neighbors
  C. MSTP dynamically manages VLAN registration in the LAN
  D. MSTP uses stacked VLAN tags to extend a layer 2 Ethernet connection between multiple sides
  A. MSTP enables mapping multiple independent spanning tree instances onto one physical.topology

• Question 73:

  Which three PoE power allocation methods are supported on EX Series switches? (Choose three.)

  A. dynamic PoE management mode
  B. static PoE management mode
  C. enhanced power negotiation
  D. LLDP power negotiation
  E. class PoE management mode
  B. static PoE management mode
  D. LLDP power negotiation
  E. class PoE management mode

• Question 74:

  -- Exhibit

  

  -- Exhibit -Click the Exhibit button.

  Site A is sending voice traffic marked with DSCP code EF. SRX A has the default CoS classifier.

  Into which forwarding class is SRX A classifying traffic?

  A. best-effort
  B. expedited-forwarding
  C. network-control
  D. assured-forwarding
  A. best-effort

• Question 75:

  A security camera is connected to an EX Series switch. You are asked to ensure power to the PoE port is maintained if the power budget is exceeded. Which two actions will accomplish this task? (Choose two.)

  A. Set the PoE management mode to static.
  B. Set the PoE management mode to class.
  C. Set the PoE interface priority to high.
  D. Ensure the camera is connected to port ge-0/0/0.
  C. Set the PoE interface priority to high.
  D. Ensure the camera is connected to port ge-0/0/0.

• Question 76:

  -- Exhibit -

  {master:0}[edit]

  user@router# show class-of-service

  classifiers {

  inet-precedence normal-traffic {

  forwarding-class best-effort {

  loss-priority low code-points [ my1 my2 ];

  }

  }

  }

  code-point-aliases {

  inet-precedence {

  my1 000;

  my2 001;

  cs1 010;

  cs2 011;

  cs3 100;

  cs4 101;

  cs5 111;

  cs6 111;

  }

  }

  -- Exhibit -

  Click the Exhibit button.

  In the exhibit, you see a configuration for CoS. Incoming traffic with specific IP precedence bits should be mapped to a forwarding class named best-effort. A classifier named normal-traffic is defined.

  What must you add to complete this configuration?

  A. Include the option q-pic-large-buffer under the chassis hierarchy to accommodate the new code points.
  B. Apply classifier normal traffic to the interface hierarchy under the class-of-service stanza.
  C. Configure a rewrite marker on the ingress Gigabit Ethernet interface.
  D. Add code point values for the expedited-forwarding forwarding class as well as the best- effort forwarding class.
  B. Apply classifier normal traffic to the interface hierarchy under the class-of-service stanza.

• Question 77:

  When using PIM-SM in SSM mode, which event triggers the creation of a shortest-path tree?

  A. Multicast traffic received at the receiver's designated router (DR).
  B. An IGMPv3 report received at the receiver's designated router (DR).
  C. Multicast traffic received at the rendezvous point (RP).
  D. An IGMPv3 report received at the source's designated router (DR).
  B. An IGMPv3 report received at the receiver's designated router (DR).

• Question 78:

  Which two statements about this scenario are correct? (choose two)

  A. the device is aware of all sources for the group
  B. the device is receiving the multicast stream using the shortest path free
  C. the forwarding path to the multicast source is through the RP
  D. the source of the group is unknown
  C. the forwarding path to the multicast source is through the RP
  D. the source of the group is unknown

• Question 79:

  Which two statements are true about SSM implementations on Junos devices? (Choose two.)

  A. There is no need for an RP.
  B. The multicast receiver's DR must have IGMPv3 enabled.
  C. SSM traffic must use the 232/8 range.
  D. ASM and SSM implementations can coexist in the same network.
  A. There is no need for an RP.
  D. ASM and SSM implementations can coexist in the same network.

• Question 80:

  You are asked to configure a CoS weighted tail drop profile on your EX Series switch that causes all traffic in the best effort queue to drop when the queue is 90 percent full.

  Which configuration will accomplish this request?

  A. [edit class-of-service] drop-profiles { be_dropp { fill-level 90; drop-probability 100; } }
  B. [edit class-of-service] drop-profiles { be_dropp { interpolate { fill-level 90; drop-probability 100; } } }
  C. [edit class-of-service] drop-profiles { be_dropp { fill-level 90; } }
  D. [edit class-of-service] drop-profiles { be_dropp { fill-level 90; drop-probability 90; } }
  C. [edit class-of-service] drop-profiles { be_dropp { fill-level 90; } }