Juniper Juniper Certifications JN0-643 Questions & Answers

• Question 211:

  -- Exhibit -MSTP information Context identifier : 0 Region name : Juniper Revision : 1 Configuration digest : 0xfdbe318c0ae799ae6dfdae4c882c67ee

  MSTI Member VLANs 0 0,4-4094 1 1-3 -- Exhibit -

  Click the Exhibit button.

  A network engineer has configured MSTP on several switches for loop protection. You must verify the work and ensure that the appropriate parameters match on all switches.

  Which operational command provides the required output shown in the exhibit?

  A. show spanning-tree interface

  B. show spanning-tree mstp configuration

  C. show spanning-tree bridge

  D. show ethernet-switching interfaces

  Correct Answer: B

• Question 212:

  -- Exhibit -user@switch-1> show spanning-tree bridge

  STP bridge parameters Context ID : 0 Enabled protocol : MSTP

  STP bridge parameters for CIST ...

  STP bridge parameters for MSTI 1 MSTI regional root : 4097.b0:c6:9a:73:27:90 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Number of topology changes : 4 Time since last topology change : 42 seconds Topology change initiator : ge-0/0/10.0 Topology change last recvd. from : 00:19:e2:55:24:8c Local parameters Bridge ID : 4097.b0:c6:9a:73:27:90 Extended system ID : 0 Internal instance ID : 1

  STP bridge parameters for MSTI 2 MSTI regional root : 8194.b0:c6:9a:73:27:90 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Number of topology changes : 4 Time since last topology change : 42 seconds Topology change initiator : ge-0/0/10.0 Topology change last recvd. from : 00:19:e2:55:24:8c Local parameters Bridge ID : 8194.b0:c6:9a:73:27:90 Extended system ID : 0 Internal instance ID : 2

  user@switch-1> show spanning-tree mstp configuration MSTP information Context identifier : 0 Region name : my-mstp-config Revision : 1 Configuration digest : 0x91ee8012e6851d931adae71da4060690

  MSTI Member VLANs 0 0,400-4094 1 1-199 2 200-399

  user@switch-2> show spanning-tree bridge

  STP bridge parameters Context ID : 0 Enabled protocol : MSTP

  STP bridge parameters for CIST ... STP bridge parameters for MSTI 1 MSTI regional root : 8193.b0:c6:9a:73:39:90 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Number of topology changes : 3 Time since last topology change : 320 seconds Topology change initiator : ge-0/0/9.0 Topology change last recvd. from : b0:c6:9a:73:27:81 Local parameters Bridge ID : 8193.b0:c6:9a:73:39:90 Extended system ID : 0 Internal instance ID : 1

  STP bridge parameters for MSTI 2 MSTI regional root : 4098.b0:c6:9a:73:39:90 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Number of topology changes : 3 Time since last topology change : 320 seconds Topology change initiator : ge-0/0/9.0 Topology change last recvd. from : 00:19:e2:55:24:8d Local parameters Bridge ID : 4098.b0:c6:9a:73:39:90 Extended system ID : 0 Internal instance ID : 2

  user@switch-2> show spanning-tree mstp configuration MSTP information Context identifier : 0 Region name : my-mstp-config Revision : 10 Configuration digest : 0x91ee8012e6851d931adae71da4060690

  MSTI Member VLANs 0 0,400-4094 1 1-199 2 200-399 -- Exhibit -

  Click the Exhibit button.

  A colleague recently implemented MSTP in your Layer 2 network and is having trouble determining why it is not working properly. You are asked to review the outputs provided in the exhibit to determine the cause.

  Referring to the exhibit, what is causing the issue?

  A. The region name is configured the same on both devices.

  B. The VLAN mapping is configured incorrectly.

  C. The MSTP revision is configured incorrectly.

  D. The bridge priority has not been configured correctly.

  Correct Answer: C

• Question 213:

  -- Exhibit -user@switch> show spanning-tree bridge

  STP bridge parameters Context ID : 0 Enabled protocol : MSTP

  STP bridge parameters for CIST Root ID : 32768.00:19:e2:55:1a:01 Root cost : 0 Root port : ge-0/0/10.0 CIST regional root : 32768.00:19:e2:55:1a:01 CIST internal root cost : 20000 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Hop count : 19 Message age : 0 Number of topology changes : 2 Time since last topology change : seconds Topology change initiator : ge-0/0/10.0 Topology change last recvd. from : 00:19:e2:55:24:8c Local parameters Bridge ID : 32768.b0:c6:9a:73:27:90

  Extended system ID : 0 Internal instance ID : 0

  STP bridge parameters for MSTI 1 MSTI regional root : 4097.b0:c6:9a:73:27:90 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Number of topology changes : 2 Time since last topology change : seconds Topology change initiator : ge-0/0/1.0 Topology change last recvd. from : b0:c6:9a:73:39:81 Local parameters Bridge ID : 4097.b0:c6:9a:73:27:90 Extended system ID : 0 Internal instance ID : 1

  STP bridge parameters for MSTI 2 MSTI regional root : 4098.b0:c6:9a:73:39:90 Root cost : 20000 Root port : ge-0/0/1.0 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Hop count : 19 Number of topology changes : 2 Time since last topology change : seconds Topology change initiator : ge-0/0/1.0 Topology change last recvd. from : b0:c6:9a:73:39:81 Local parameters Bridge ID : 8194.b0:c6:9a:73:27:90 Extended system ID : 0 Internal instance ID : 2 -- Exhibit -

  Click the Exhibit button.

  Referring to the exhibit, which two statements are correct about the MSTP configuration? (Choose two.)

  A. The local switch is not the root bridge for MSTI 1.

  B. The local switch is the root bridge for MSTI 1.

  C. The local switch is the root bridge for MSTI 2.

  D. The local switch is not the root bridge for MSTI 2.

  Correct Answer: BD

• Question 214:

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

  Which three parameters must match on all devices within the same region? (Choose three.)

  A. region name

  B. hello timer

  C. maximum age

  D. revision level

  E. VLAN mapping table

  Correct Answer: ADE

• Question 215:

  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.

  Correct Answer: BCE

• Question 216:

  Which two statements are correct about MSTP? (Choose two.)

  A. It allows you to preprovision VLAN IDs to spanning tree instances.

  B. It provides a more scalable solution than VSTP.

  C. It is not supported when using MVRP.

  D. It allows you to use VLAN groups to simplify configuration tasks when groups of VLANs use the same parameters.

  Correct Answer: AB

• Question 217:

  -- Exhibit

  

  -- Exhibit -

  Click the Exhibit button.

  Referring to the exhibit, which two statements are true regarding the MSTP port role and port state of ge- 0/0/0 and ge-0/0/1 on SW1?

  A. Port ge-0/0/0 is a root port and ge-0/0/1 is an alternate port.

  B. Both ports are designated ports.

  C. Both ports are in a forwarding state.

  D. Port ge-0/0/0 is a root port and ge-0/0/1 is in a forwarding state.

  Correct Answer: BC

• Question 218:

  -- Exhibit -[edit protocols vstp] 'vlan all' Cannot configure VSTP on all VLANs when more than 253 VLANs are configured. Configure vstp vlan- group along with STP or RSTP to cover all VLANs [edit protocols] 'vstp' Failed to configure vstp on all vlans error: configuration check-out failed -- Exhibit -

  Click the Exhibit button.

  What are two reasons for the commit error shown in the exhibit? (Choose two.)

  A. The set protocols vstp vlan all configuration is not supported.

  B. There are more than 253 VLANs configured on the switch.

  C. MSTP is not configured with VSTP.

  D. STP or RSTP is not configured along with VSTP on the switch.

  Correct Answer: BD

• Question 219:

  -- Exhibit

  

  -- Exhibit -Click the Exhibit button.

  You have implemented a firewall-based VLAN filter to map traffic from subnet 192.168.40.0/24 to a VLAN named vlan_40. However, you have not been successful in getting the traffic mapped correctly. In addition, all traffic must be passed to

  the Layer 2 network.

  Referring to the exhibit, which three commands are required to accomplish this behavior? (Choose three.)

  A. set interfaces ge-0/0/19.0 family ethernet-switching filter output assign_vlan

  B. set interfaces ge-0/0/19.0 family ethernet-switching filter input assign_vlan

  C. set vlans vlan_40 interface ge-0/0/19.0 mapping policy

  D. set vlans vlan_30 interface ge-0/0/19.0 mapping policy

  E. set interfaces ge-0/0/20 unit 0 family ethernet-switching port-mode trunk vlan members all

  Correct Answer: BCE

• Question 220:

  -- Exhibit

  

  -- Exhibit -Click the Exhibit button. You are asked to separate the human resources group from the finance group on the company network even though they share the same VLAN. You consider using PVLANs, and you delegate the task to a junior engineer who submits the

  configuration shown in the exhibit to accomplish this task. After review, you realize that the PVLAN implementation will not work correctly. Referring to the exhibit, which three commands must be included to resolve the problem? (Choose three.)

  A. set vlans pvlan no-local-switching

  B. set vlans hr-group no-local-switching

  C. set vlans finance-group no-local-switching

  D. set vlans hr-group primary-vlan pvlan

  E. set vlans finance-group primary-vlan pvlan

  Correct Answer: ADE