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Juniper JN0-649 Exam Questions

Juniper JN0-649 Exam Questions Answers

Enterprise Routing and Switching Professional (JNCIP-ENT)

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Juniper JN0-649 Sample Questions – Free Practice Test & Real Exam Prep

Question #1

 What are two similarities between OSPFv2 and OSPFv3? (Choose two.)

  • A. virtual links  
  • B. support for multiple instances per link  
  • C. 32-bit router ID  
  • D. protocol processing per link, not per sub net  
Answer: A,C 
Question #2

You are deploying new Juniper EX Series switches in a network that currently is using Cisco’s Per-VLAN spanning tree plus (PVST+) and you must provide compatibility with this environment. Which spanning tree protocol do you deploy in this scenario?

  • A. STP  
  • B. MSTP  
  • C. VSTP  
  • D. RSTP  
Answer: B 
Question #3

You are asked to establish interface level authentication for users connecting to your network. You must ensure that only corporate devices, identified by MAC addresses, are allowed to connect and authenticate. Authentication must be handled by a centralized server to increase scalability. Which authentication method would satisfy this requirement? 

  • A. MAC RADIUS  
  • B. captive portal  
  • C. 802.1X with single-secure supplicant mode  
  • D. 802.1X with multiple supplicant mode  
Answer: A
Explanation:

https://www.juniper.net/documentation/us/en/software/junos/useraccess/topics/topic-map/mac-radius-au... 
You can configure MAC RADIUS authentication on an interface that also allows 802.1X authentication, or you can configure either authentication method alone.

 If both MAC RADIUS and 802.1X authentication are enabled on the interface, the switch first sends the host three EAPoL requests to the host. If there is no response from the host, the switch sends the host’s MAC address to the RADIUS server to check whether it is a permitted MAC address. If the MAC address is configured as permitted on the RADIUS server, the RADIUS server sends a message to the switch that the MAC address is a permitted address, and the switch opens LAN access to the nonresponsive host on the interface to which it is connected.
Question #4

When using wide metrics, which two statements about route advertisement between IS-IS levels are correct?(Choose two.) 

  • A. Level 1 and Level 2 routers do not advertise Level 2 routes into the Level 1 area by default. 
  • B. Level 1 routes are advertised to Level 2 routers by default.  
  • C. If wide-metrics-only is configured, Level 1 routes are not advertised to Level 2 routers by default.
  • D. Level 1 routes advertised as external routes into Level 1 are not advertised to any Level 2 routers by default. 
Answer: A,C 
Question #5

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

  • A. Type 1 route advertisements always have the single-active flag set to 1.  
  • B. Junos OS supports underlay replication for BUM traffic forwarding.  
  • C. Junos OS supports ingress replication for BUM traffic forwarding.  
  • D. Type 1 route advertisements always have thesingle-active flag set to 0.  
Answer: 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. 
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