Juniper Juniper Certifications JN0-643 Questions & Answers

• Question 141:

  Which two statements about MVRP on EX Series switches are true? (Choose two.)

  A. MVRP can add VLANs on access interfaces.

  B. MVRP can add VLANs on trunk interfaces.

  C. MVRP adds VLANs on MVRP-enabled interfaces by default.

  D. MVRP is in transparent mode on MVRP-enabled interfaces by default.

  Correct Answer: BC

• Question 142:

  Which two LSA types are only generated by an ABR router? (Choose two.)

  A. ASBR summary LSA (Type 4)

  B. ASBR LSA (Type 5)

  C. Summary LSA (Type 3)

  D. Router LSA (Type 1)

  Correct Answer: AC

• Question 143:

  In MSTP, which two factors determine the root bridge in each region? (Choose two.)

  A. The switch with the higher priority becomes the root bridge.

  B. The switch with the lower priority becomes the root bridge.

  C. The switch with the lower MAC address becomes the root bridge when priorities are tied.

  D. The switch with the higher MAC address becomes the root bridge when priorities are tied.

  Correct Answer: BC

• Question 144:

  A Layer 2 transparent firewall separates two OSPFv3 routers. For the two OSPFv3 routers to form an adjacency, which protocol must be permitted on the firewall?

  A. IPv4 protocol 89

  B. IPv6 protocol 89

  C. TCP port 89

  D. UDP port 89

  Correct Answer: B

• Question 145:

  A network administrator is configuring CoS on a switch and assigns forwarding classes call-sig and critical to the same queue number per the configuration below:

  class-of-service {

  forwarding-classes {

  class best-effort queue-num 0;

  class bulk-data queue-num 1;

  class critical queue-num 3;

  class voice queue-num 6;

  class call-sig queue-num 3;

  }

  }

  Based on the configuration, which option prioritizes call-sig traffic over critical traffic?

  A. Assign call-sig and critical to different schedulers.

  B. Assign call-sig and critical to different scheduler maps.

  C. Assign a loss priority of high to the packets in the critical forwarding class and configure drop profiles in the scheduler configuration.

  D. Assign a loss priority of high to the packets in the critical forwarding class and set priority high in the scheduler configuration.

  Correct Answer: C

• Question 146:

  You notice that a number of IGMP leave group messages are passing through a BMA network and are impacting the network's performance.

  What would you do to resolve this issue without affecting multicast traffic?

  A. Apply an import policy to control leave group messages.

  B. Suppress group-specific queries.

  C. Suppress generic IGMP queries.

  D. Enable promiscuous-mode in IGMP.

  Correct Answer: B

• Question 147:

  What is the significance of the multicast address range 224.0.0.1 through 224.0.0.254?

  A. They have link-local scope.

  B. They have administrative region scope.

  C. They are reserved for future use.

  D. They have a scope of two or more hops from a router.

  Correct Answer: A

• Question 148:

  You must prioritize VoIP packets on your network.

  Which feature will accomplish this goal?

  A. RSVP

  B. Multicast Routing

  C. VPLS

  D. Class of Service

  Correct Answer: C

• Question 149:

  R1 has an OSPF adjacency with R2 over a point-to-point link.

  Which three statements about the advertisements for this link in the Type 1 (Router) LSA generated by R1 are true? (Choose three.)

  A. It has a value in the link ID field with R2's interface IP address.

  B. It has a value in the link ID field with R2's router ID.

  C. It has a link-type of point-to-point (Type 1).

  D. It has a link-type of Transit (Type 2).

  E. It has a link-type of stub (Type 3).

  Correct Answer: BDE

• Question 150:

  You have a requirement for a device to provide 20 W of power over Ethernet.

  What meets this requirement?

  A. Bond two standard PoE ports together to achieve 30.8 W of power.

  B. Install an external redundant power supply in the switch to increase the total power load.

  C. Select a switch that has PoE+ support.

  D. Enable LLDP-MED to transfer power from other switches.

  Correct Answer: C