Juniper JN0-643 Online Practice Questions and Exam Preparation

Juniper JN0-643 Online Questions & Answers

• Question 41:

  Which two statements is true regarding the MED attribute? (Choose two)

  A. it is not passed across multiple autonomous systems
  B. the highest value is preferred
  C. it is passed across multiple autonomous system
  D. the lowest value is preferred
  A. it is not passed across multiple autonomous systems
  D. the lowest value is preferred

• Question 42:

  -- Exhibit -

  {master:0}[edit] user@router# run show ospf interface vl-10.20.10.2 extensive Interface State Area DR ID BDR ID Nbrs vl-10.20.10.2 Down 0.0.0.0 0.0.0.0 0.0.0.0 0 TypE. Virtual, Address: 0.0.0.0, Mask: 0.0.0.0, MTU: 0, Cost: 1 Transit AreA. 0.0.0.1 Adj count: 0 Hello: 10, DeaD. 40, ReXmit: 5, Not Stub Auth typE. None Protection typE. None, No eligible backup Topology default (ID 0) -> Down, Cost: 0 -- Exhibit -

  Click the Exhibit button.

  Your company is integrating another OSPF area into your existing OSPF infrastructure. You created a virtual link that spans Area 2 and connects Area 3 to the backbone area.

  Based on the exhibit, what is preventing the adjacency?

  A. The interface configured for the virtual link is incorrect. It should be a vt and not a vl interface.
  B. No designated router (DR) has been elected.
  C. The backup route to Area 2 has not been configured.
  D. The wrong transit area is configured.
  D. The wrong transit area is configured.

• Question 43:

  What is an IP multicast routing protocol?

  A. RSVP
  B. OSPF
  C. PIM
  D. CDP
  C. PIM

• Question 44:

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

• Question 45:

  Which statement is true regarding the SPF algorithm?

  A. The SPF algorithm is run on a per-domain basis.
  B. If you apply an import policy to OSPF, it keeps LSAs from being flooded, and the SPF calculation can be affected.
  C. There are two databases used in the calculation, the link-state database and the tree database.
  D. The SPF calculation is run on a per-area basis on each router.
  D. The SPF calculation is run on a per-area basis on each router.

• Question 46:

  A customer wants to connect computer and IP telephone equipment to a switch using the same port. LLDP-MED has been turned onto discover VoIP equipment.

  Which two statements are true in this scenario? (Choose two)

  A. the switch will identify voice traffic automatically based on the source MAC address
  B. the access port can be configured to accept both tagged voice traffic and untagged data traffic
  C. the computer and VOIP equipment must be in the same VLAN on an access port
  D. the switch can send configuration information to the IP phone to assign it a VLAN automatically
  B. the access port can be configured to accept both tagged voice traffic and untagged data traffic
  D. the switch can send configuration information to the IP phone to assign it a VLAN automatically

• Question 47:

  You are attempting to configure BGP peering to a new service provider. The BGP peering state is stuck in the active state. What are two reasons for this happening? (Choose two)

  A. The local autonomous system number is not configure.
  B. The origin ID is not configure.
  C. The peer IP address is incorrect.
  D. The peer autonomous number is incorrect.
  C. The peer IP address is incorrect.

• Question 48:

  Which protocol is a multicast protocol?

  A. OSPF
  B. BGP
  C. PIM
  D. IS-IS
  C. PIM

• Question 49:

  -- 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.
  C. The MSTP revision is configured incorrectly.

• Question 50:

  Which statement is correct regarding the isolated ports?

  A. isolated ports are trunk ports that have layer 2 connectivity with all other ports
  B. isolated port are access ports that only have layer 2 connectivity with other isolated port
  C. isolated port are access port that only have layer 2 connectivity with promosious ports
  D. isolated port are trunk ports that have layer 2 connectivity with all community ports
  C. isolated port are access port that only have layer 2 connectivity with promosious ports