Juniper JN0-643 Online Practice Questions and Exam Preparation

Juniper JN0-643 Online Questions & Answers

• Question 251:

  Which two statements about VSTP on EX series switches are connect? (Choose two)

  A. All VLANS beyond the first 64 will not be supported by VSTP
  B. VSTP automatically assigns each VLAN to one spanning tree instances
  C. VSTP must be used to intemperate with MVRP
  D. VSTP must be used to intemperate with PVST+
  B. VSTP automatically assigns each VLAN to one spanning tree instances
  D. VSTP must be used to intemperate with PVST+

• Question 252:

  You are a service provider and have multiple customers in a building. You are installing a new switch that can host all of your customers. However, you would like to ensure that one customer cannot see or broadcast to another customer. You

  would also like to have them use a common gateway IP address from the building.

  What of following should be used to provide this access?

  A. Layer 2 tunneling
  B. VLAN
  C. filter-based VLAN
  D. private VLAN
  D. private VLAN

• Question 253:

  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.
  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.

• Question 254:

  -- Exhibit -[edit protocols ospf]

  user@R2# show

  area 0.0.0.3 {

  stub default-metric 10 no-summaries;

  interface ge-0/1/1.0;

  }

  -- Exhibit -

  Click the Exhibit button.

  Referring to the output in the exhibit, which statement is true?

  A. R2 is an ABR and will send a Type 7 LSA 0/0 route down into the nonbackbone area.
  B. R2 is an ABR and will send a Type 3 LSA 0/0 route down into the nonbackbone area.
  C. R2 will not send a Type 3 LSA 0/0 route into the nonbackbone area.
  D. R2 will add a metric cost of 10 to the existing metric of a 0/0 route it receives from the backbone area and then send it into the nonbackbone area in a Type 5 LSA.
  B. R2 is an ABR and will send a Type 3 LSA 0/0 route down into the nonbackbone area.

• Question 255:

  -- Exhibit -

  user@R1> show configuration protocols pim rp

  local {

  address 192.168.3.1;

  }

  auto-rp discovery;

  static {

  address 192.168.5.1;

  }

  user@R1> show route 192.168.0.0/16

  inet.0: 18 destinations, 21 routes (18 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both

  192.168.2.1/32 *[Direct/0] 3w4d 04:58:14

  > via lo0.0

  192.168.5.1/32 *[OSPF/10] 00:52:25, metric 1

  > via lt-0/0/0.0

  192.168.10.1/32 *[OSPF/10] 00:48:06, metric 1

  > via lt-0/0/0.2

  192.168.50.1/32 *[OSPF/10] 00:48:06, metric 1

  > via lt-0/0/0.4

  -- Exhibit -

  Click the Exhibit button.

  Router R1 in the exhibit is receiving auto-RP announce messages specifying an RP of 192.168.10.1 and BSR messages specifying an RP-set with an RP of 192.168.50.1.

  Which address will R1 use as the RP for traffic destined to the 224.1.1.1 multicast group?

  A. 192.168.3.1
  B. 192.168.5.1
  C. 192.168.10.1
  D. 192.168.50.1
  D. 192.168.50.1

• Question 256:

  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)
  A. ASBR summary LSA (Type 4)
  C. Summary LSA (Type 3)

• Question 257:

  You manage your company enterprises network using EX series switches. Your company wants to use Q in Q tunneling to connect remote customer sites together. Which statement is correct about the scenario?

  A. You must enable L2PTto tunnel layer 2 protocol traffic
  B. The outside layer 2 frame is popped by the penultimate switch
  C. Customer traffic is tunneled through the network using the C VLAN ID
  D. The default Ethernet value is 0x9100
  A. You must enable L2PTto tunnel layer 2 protocol traffic

• Question 258:

  Two PCs are attached to a hub, which is attached to port ge-0/0/0 on your EX Series switch. You must separate the incoming traffic from the PCs into two VLANs.

  What should you use to accomplish this task?

  A. dynamic VLAN registration with MVRP
  B. private VLAN
  C. filter-based VLAN
  D. guest VLAN
  C. filter-based VLAN

• Question 259:

  Which statement regarding LLDP update messages is correct?

  A. Updates can be secured using the MD5 algorithm.
  B. Updates are advertised every 60 seconds by default.
  C. Updates require bidirectional communication.
  D. Updates can be triggered by local changes.
  D. Updates can be triggered by local changes.

• Question 260:

  You are asked to implement VSTP on all devices in your Layer 2 network.

  Which three statements are correct? (Choose three.)

  A. VSTP supports up to 256 different spanning-tree topologies.
  B. A BPDU is sent for each spanning-tree instance.
  C. Each VLAN will be assigned to a unique spanning-tree instance.
  D. MSTP can be used in addition to VSTP to account for VLANs outside of the supported range.
  E. VSTP can be used to load-balance Layer 2 traffic using VLANs.
  B. A BPDU is sent for each spanning-tree instance.
  C. Each VLAN will be assigned to a unique spanning-tree instance.
  E. VSTP can be used to load-balance Layer 2 traffic using VLANs.