Juniper Juniper Certification JN0-649 Questions & Answers

• Question 51:

  You must ensure that all routes in the 10.0.0/8address range are not advertised outside of your AS. Which well-known BGP community should be assigned to these addresses to accomplish this task?

  A. no-export

  B. no-peer

  C. internet

  D. no-advertise

  Correct Answer: A

  For specifying the BGP community attribute only, you also can specify community-ids as one of the following well-known community names defined in RFC 1997:

  no-advertise--Routes containing this community name are not advertised to other BGP peers.

  no-export--Routes containing this community name are not advertised outside a BGP confederation boundary.

  no-export-subconfed--Routes containing this community are advertised to IBGP peers with the same AS number, but not to members of other confederations.

  llgr-stale--Adds a community to a long-lived stale route when it is readvertised.

  no-llgr--Marks routes which a BGP speaker does not want to be retained by LLGR. The Notification message feature does not have any associated configuration parameters.

  https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/ref/statement/comm unity-edit-routing-options.html

• Question 52:

  Your enterprise network uses routing instances to support multitenancy. Your Junos devices use BGP to peer to multiple BGP devices. You must ensure that load balancing is achieved within the routing instance. Which two statements would accomplish this task? (Choose two.)

  A. Configure the multipath option at the [edit protocols bgp group neighbor] hierarchy.

  B. Configure the multipath option at the [edit protocols bgp group] hierarchy.

  C. Configure a load-balance per-packet policy and apply it at the [edit routing-options forwarding-table] hierarchy.

  D. Configure the multipath option at the [edit routing-instances routing-options] hierarchy.

  Correct Answer: BC

  Fortunately, the Juniper Networks BGP implementation supports the notion of a bandwidth community. This extended community encodes the bandwidth of a given next hop, and when combined with multipath, the load-balancing algorithm distributes flows across the set of next hops proportional to their relative bandwidths. Put another way, if you have a 10-Mbps and a 1-Mbps next hop, on average nine flows will map to the high-speed next hop for every one that uses the low speed.

  Use of BGP bandwidth community is supported only with per-packet load balancing.

  The configuration task has two parts:

  Configure the external BGP (EBGP) peering sessions, enable multipath, and define an import policy to tag routes with a bandwidth community that reflects link speed.

  Enable per-packet (really per-flow) load balancing for optimal distribution of traffic.

  https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/topic-map/load-balancing-bgp-session.html

• Question 53:

  Remote branches connect to the corporate WAN through access switches. The access switches connect to access ports on the WAN distribution switch, as shown in the exhibit. L2PT has previously been configuredon the tunnel Layer 2 traffic across the WAN. You decide to move the L2PT tunnel endpoints to the access switches. When you apply the L2PT configuration to the access switches, the ports that connect the access switches to the distribution switch shut down.

  Which action would solve this problem?

  

  A. Configure the links between the access switches and the distribution switch as a trunk port.

  B. Disable the BPDU block function on the access switches.

  C. Disable the BPDU block function on thedistribution switch.

  D. Configure a GRE tunnel to encapsulate the L2PT traffic across the WAN.

  Correct Answer: A

  Access interfaces in an L2PT-enabled VLAN should not receive L2PT-tunneled PDUs. If an access interface does receive L2PT-tunneled PDUs, there might be a loop in the network, and the device will shut down the interface. https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topic-map/layer-2-protocol-tunneling.html

• Question 54:

  Referring to the exhibit, ServerA sends a single IP packet destined to 10.0.0.127.

  Which two statements correctly describe the behavior of the resulting outbound VXLAN packets that contain the original packet destined to 10.0.0.127? (Choosetwo.)

  

  A. Router E will replicate and send a copy of the received VXLAN packet to router D.

  B. Router C will send a VXLAN packet destined only to router D and router E.

  C. Router D will not replicate and send a copy of the received VXLAN packet to routerE.

  D. Router C will send a single VXLAN packet to one remote VTEP.

  Correct Answer: AD

• Question 55:

  Which two statements are correct regarding the behavior shown in the exhibit? (Choosetwo.)

  

  A. The ge-1/1/0 interface is configured as secondary for Area 0.

  B. The router is an ABR.

  C. The router is not an ABR.

  D. The ge-1/1/0 interface is configured as secondary for Area 100.

  Correct Answer: BD

• Question 56:

  You are deploying IP phones in your enterprise network that must receive their power through their Ethernet connection. You are using your EX Series switch's PoE ports that support IEEE 802.3af.

  In this scenario, what is the maximum amount of power allocated to each interface?

  A. 10.2 W

  B. 15.4 W

  C. 30 W

  D. 50 W

  Correct Answer: B

• Question 57:

  You are asked to troubleshoot voice quality issues on your newly implement VoIP network. You notice that the voice packets are being dropped. You haveverified that the packets are correctly marked for expedited forwarding queue.

  Referring to the exhibit, what must you configure to solve the problem?

  

  

  A. You must configure a multifield classifier to put the VoIP traffic in the correctqueue.

  B. You must configure a rewrite rule to ensure that the traffic is scheduled properly in the device.

  C. You must configure a scheduler to allocate bandwidth to the expedited forwarding queue.

  D. You must configure a policer to ensure that the queueis not being starved.

  Correct Answer: C

• Question 58:

  Referring to the exhibit, a PIM-SM network is set up to enable communication between multicast devices.

  Which two statements are true? (Choose two.)

  

  A. Before the formation of the rendezvous-point tree, a join message is sent from R1 to R3.

  B. Before theformation of the rendezvous-point tree, an IGMP is sent from the Receiver to R1.

  C. Before the formation of the rendezvous-point tree, an IGMP is sent from the Source to R5.

  D. Before the formation of the rendezvous-point tree, a join message is sent from R1 to R5.

  Correct Answer: BC

• Question 59:

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

  

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

  B. DS-1 is the root bridge for VLAN 10.

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

  D. Default VSTP bridge priority values are configured.

  Correct Answer: AC

• Question 60:

  Referring to the exhibit, anycast RP is implemented to ensure multicast service availability. The source is currently sending multicast traffic using group 239.1.1.1 and R3 is receiving PIM register messages, but R2 does not have active source information.

  In this scenario, what are two methods to receive the active source information on R2? (Choose two.)

  

  A. Configure an RP set in PIM on R1, allowing R1 to forward PIM register messages to R2 and R3 in the set.

  B. Configure an MSDP protocol between R2 andR3.

  C. Configure an RP set in PIM on R2 and R3, allowing the RPs to forward PIM register messages to the other RPs in the set.

  D. Configure an MSDP protocol between R1 and R2.

  Correct Answer: AC

  https://www.juniper.net/documentation/us/en/software/junos/multicast/topics/ref/statement/rp-set-edit-protocols-pim.html