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Juniper JN0-649 Exam (page: 2)
Juniper Enterprise Routing and Switching, Professional (JNCIP-ENT)
Updated on: 25-Dec-2025

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JN0-649 PDF 65 Questions

Which address range is used for source-specific multicast?

  1. 239.0.0.0/8
  2. 233.0.0.0/8
  3. 232.0.0.0/8
  4. 224.2.0.0/16

Answer(s): C

Explanation:

PIM SSM introduces new terms for many of the concepts in PIM sparse mode. PIM SSM can technically be used in the entire 224/4 multicast address range, although PIM SSM operation is guaranteed only in the 232/8 range (232.0.0/24 is reserved). The new SSM terms are appropriate for Internet video applications and are summarized in Table 1. https://www.juniper.net/documentation/us/en/software/junos/multicast/topics/concept/multicast- pim-ssm.html



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

  1. VLAN to instance mapping
  2. revision level
  3. configuration name
  4. bridge priority
  5. region name

Answer(s): 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



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

  1. Type 1 route advertisements always have the single-active flag set to 1.
  2. Junos OS supports underlay replication for BUM traffic forwarding.
  3. Junos OS supports ingress replication for BUM traffic forwarding.
  4. Type 1 route advertisements always have the single-active flag set to 0.

Answer(s): 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.



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. Configure an import policy on the remote peer to reject the routes when they are received.
  2. Configure an export policy on the local BGP peer to reject the VPN routes being sent to the remote peer.
  3. Configure a route reflector for the VPN NLRI.
  4. Configure the apply-vpn-export feature on the local BGP peer.

Answer(s): 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



You want to create an OSPF area that only contains intra-area route information in the form of Type 1 and Type 2 LSAs.
In this scenario, which area is needed to accomplish this task?

  1. totally non-to-stubby area
  2. totally stubby area
  3. stub area
  4. non-to-stubby area

Answer(s): B

Explanation:

A totally stubby area (TSA) is a stub area in which summary link-state advertisement (type 3 LSAs) are not sent. A default summary LSA, with a prefix of 0.0. 0.0/0 is originated into the stub area by an ABR, so that devices in the area can forward all traffic for which a specific route is not known, via ABR.



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