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JN0-649 Real Exam Questions

Enterprise Routing and Switching, Professional (JNCIP-ENT)

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Question 1 Multiple choice

Your enterprise network is running BGP VPNs to support multitenancy. Some of the devices with which you peer BGP do not support the VPN NLRI. You must ensure that you do not send BGP VPN routes to the remote peer.

Which two configuration steps will satisfy this requirement? (Choose two.)

  1. A

    Configure an import policy on the remote peer to reject the routes when they are received.

  2. B

    Configure an export policy on the local BGP peer to reject the VPN routes being sent to the remote peer.

  3. C

    Configure a route reflector for the VPN NLRI.

  4. D

    Configure the apply-vpn-export feature on the local BGP peer.

Show answer and explanation

Correct answers: B, D

Explanation

Apply both the VRF export and BGP group or neighbor export policies (VRF first, then BGP) before routes from the vrf or l2vpn routing tables are advertised to other PE routers.
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/ref/statement/vpn-apply-export-edit-protocols-bgp-vp.html

Question 2 Single choice

You recently committed a change to a router to reject OSPF routes sourced from area 10. However, you are still seeing area 10 routes in the routing table.

Referring to the exhibit, which statement is correct?

  1. A

    The OSPF protocol is first matched by find-ospf and accepted.

  2. B

    The routes only timeout after 24 hours.

  3. C

    The routes remain in the table until the device is rebooted.

  4. D

    The routes remain in the table until the routing daemon is restarted.

Show answer and explanation

Correct answer: A

Explanation

Once a route is accepted, no other terms in the routing policy are evaluated.

Question 3 Multiple choice

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

  1. A

    The host that the route is associated with is multihomed to two leaf nodes.

  2. B

    The route is a Type 1 EVPN route.

  3. C

    The route is a Type 2 EVPN route.

  4. D

    The hostthat the route is associated with is single-homed to one leaf node.

Show answer and explanation

Correct answers: C, D

Question 4 Multiple choice

You are troubleshooting a BGP connection.

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

  1. A

    Packetfragmentation is preventing the session from establishing.

  2. B

    The 192.168.1.5 peer has a misconfigured MD5 key.

  3. C

    The ge-0/0/1 interface is disabled.

  4. D

    The 192.168.1.4 peer has a misconfigured autonomous system number.

Show answer and explanation

Correct answers: B, D

Question 5 Single choice

You are troubleshooting connectivity between an EVPN spine switch configured as a route reflector and a leaf node with an IP address of 10.30.100.6.

Referring to the exhibit, what is the problem?

  1. A

    The neighbor 10.30.100.3 statement is missing from leaf1's configuration.

  2. B

    The spinenode is not configured for the family inet NLRI.

  3. C

    The neighbor 10.30.100.6 statement is missing from spine1's configuration.

  4. D

    The leaf node is not configured for the family evpn NLRI.

Show answer and explanation

Correct answer: B

Question 6 Multiple choice

Which two statements are correct about the deployment of EVPN-VXLAN on QFX Series devices? (Choose two.)

  1. A

    Type 1 routeadvertisements always have the single-active flag set to 1.

  2. B

    Junos OS supports underlay replication for BUM traffic forwarding.

  3. C

    Junos OS supports ingress replication for BUM traffic forwarding.

  4. D

    Type 1 route advertisements always have thesingle-active flag set to 0.

Show answer and explanation

Correct answers: C, D

Explanation

BUM Traffic Forwarding
Junos devices that use MPLS encapsulation for EVPNs can only use ingress replication at this time.
Ingress replication means, to flood traffic to remote PE routers, the traffic has to be replicated, once for
each remote PE router.
The EVPN label for this BUM traffic is learned per PE router from the route type 3, inclusive multicast Ethernet tag route.
This table shows the format of the inclusive multicast Ethernet tag route.
All-Active Redundancy (4)
This diagram shows the format of the type 1 route, A-D route per ES. The split horizon label is advertised as part of an extended community attached to the type 1 route. The split horizon label is also called the ESI label. The extended community also indicates what type of redundancy mode is used for this given ESI: single-active represented by binary 1 or active-active represented by binary 0.

Question 7 Multiple choice

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

  1. A

    BPDUs from the root bridge for VLAN 10 have been received on the ge-0/0/7.0 interface.

  2. B

    DS-1 is the root bridge for VLAN 10.

  3. C

    BPDUs fromthe root bridge for VLAN 20 have been received on the ge-0/0/7.0 interface.

  4. D

    Default VSTP bridge priority values are configured.

Show answer and explanation

Correct answers: A, C

Question 8 Multiple choice

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

  1. A

    VLAN to instance mapping

  2. B

    revision level

  3. C

    configuration name

  4. D

    bridge priority

  5. E

    region name

Show answer and explanation

Correct answers: A, B, E

Explanation

When enabling MSTP, you define one or more MSTP regions. An MSTP region defines a logical domain where multiple spanning-tree instances (MSTIs) can be administered independently of MSTIs in other regions, setting the boundary for bridge protocol data units (BPDUs) sent by one MSTI. An MSTP region is a group of switches that is defined by three parameters:

Region name--User-defined alphanumeric name for the region.

Revision level--User-defined value that identifies the region.

Mapping table--Numerical digest of VLAN-to-instance mappings.
https://www.juniper.net/documentation/us/en/software/junos/stp-l2/topics/topic-map/spanning-tree-configuring-mstp.html

Question 9 Multiple choice

Referring to the outputs shown in the exhibit, which two statements are correct about the IS-IS adjacency? (Choose two.)

  1. A

    R1 is configured to participate in bothLevel 1 and Level 2.

  2. B

    R2 is configured to participate in both Level 1 and Level 2.

  3. C

    R1 is configured to participate in Level 2 only.

  4. D

    R2 is configured to participate in Level 2 only.

Show answer and explanation

Correct answers: A, D

Question 10 Single choice

In OSPF, how does a router ensure that LSAs advertised to a neighboring router are received?

  1. A

    LSA flooding guarantees that all routers will receive them successfully.

  2. B

    LSAs are sent over a TCP connection.

  3. C

    LSAs are acknowledged by the neighboring router.

  4. D

    LSAs are advertised with an acknowledgement bit.

Show answer and explanation

Correct answer: C