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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q117-Q122):

NEW QUESTION # 117
Which two statements are correct about using LACP on a Junos device? (Choose two.)

A. One side of the LACP session must be in active mode to exchange LACP packets on a Junos device.
B. Both sides of the LACP session must be in active mode to exchange LACP packets on a Junos device.
C. LACP is used to monitor the status of an aggregated Ethernet bundle's member interfaces on a Junos device.
D. LACP is used to automatically add and delete interfaces from aggregated Ethernet bundles on a Junos device.

Answer: A,C

NEW QUESTION # 118
Referring to the exhibit, which statement is correct?

A. The ge-0/0/12 interfaces is an access port.
B. The ge-0/0/0 interface has been explicitly assigned to a VLAN named default.
C. The default VLAN is a user defined VLAN name.
D. The asterisk indicates that the interface is active.

Answer: D

NEW QUESTION # 119
Exhibit:

Referring to the exhibit, at which interval will the interface be considered down if no hello packets are received?

A. 400 milliseconds
B. 400 seconds
C. 2000 seconds
D. 2000 milliseconds

Answer: D

Explanation:
The exhibit shows the configuration ofBidirectional Forwarding Detection (BFD)for OSPF on interface xe-
0/0/4.0, with the following parameters:
* minimum-interval: 400 milliseconds
* multiplier: 5
Step-by-Step Breakdown:
* BFD Liveness Detection:BFD is used to detect link failures at sub-second intervals, providing faster convergence times for routing protocols like OSPF. Theminimum-intervalis the time between BFD control packets (in milliseconds), and themultiplierindicates how many missed BFD packets trigger a failure.
* Calculating Failure Detection Time:The failure detection interval is calculated as:
Failure Interval=minimum-interval×multiplier ext{Failure Interval} = ext{minimum-interval} imes ext
{multiplier}Failure Interval=minimum-interval×multiplier
In this case:
400 milliseconds×5=2000 milliseconds(2seconds)400 , ext{milliseconds} imes 5 = 2000 , ext
{milliseconds} (2 seconds)400milliseconds×5=2000milliseconds(2seconds)
* Conclusion:If no BFD control packets are received within2000 milliseconds (2 seconds), the interface will be considered down, triggering OSPF to recalculate routes.
Juniper Reference:
* BFD Configuration: BFD parameters such as minimum-interval and multiplier are used to fine-tune the failure detection time for faster convergence.

NEW QUESTION # 120
When configuring static routes, which command is typically used?

A. set firewall filter
B. set route aggregate
C. set routing-options rib-groups
D. set protocols static route

Answer: D

NEW QUESTION # 121
Which statement is correct about a three-stage IP fabric underlay?

A. Every ingress interface into the fabric is only two hops away from the egress interface.
B. Every server that connects to a three-stage IP fabric must be multihomed.
C. Every leaf device can communicate directly with other leaf devices.
D. Every spine device can communicate directly with other spine devices.

Answer: A

Explanation:
In athree-stage IP fabric(also known as a Clos fabric), traffic between any two points (ingress to egress) in the fabric isonly two hops away.
Step-by-Step Breakdown:
* Three-Stage IP Fabric:
* Leaf Layer: Leaf switches connect directly to servers and edge devices.
* Spine Layer: Spine switches provide connectivity between leaf switches but do not connect to each other directly.
* Two-Hop Communication:In this architecture, every leaf switch is connected to every spine switch.
Therefore, when a packet enters the fabric via an ingress leaf switch, it is forwarded to a spine switch, which then directs the packet to the correct egress leaf switch. This path always involves exactly two hops:
* Ingress leaf # Spine # Egress leaf.
* Benefits:This consistent two-hop path ensures predictable latency and makes the network highly scalable while maintaining low complexity.
Juniper Reference:
* IP Fabric Architecture: This two-hop property of Clos fabrics is a hallmark of spine-leaf designs, as supported by Juniper's QFX and EX switches in data centers.

NEW QUESTION # 122
......

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