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Juniper JN0-683 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Layer 3 Fabrics: This section measures the knowledge of professionals managing IP-based networks in data centers. It covers IP fabric architecture and routing, ensuring candidates understand how the network is structured for scalability and how traffic is routed efficiently.
Topic 2
  • EVPN-VXLAN Signaling: This section assesses an understanding of Ethernet VPN (EVPN) concepts, including route types, multicast handling, and Multiprotocol BGP (MBGP). It also covers EVPN architectures like CRB and ERB, MAC learning, and symmetric routing.
Topic 3
  • Data Center Deployment and Management: This section assesses the expertise of data center networking professionals like architects and engineers, focusing on key deployment concepts. Topics include Zero-touch provisioning (ZTP), which automates device setup in data centers without manual input.
Topic 4
  • VXLAN: This part requires knowledge of VXLAN, particularly how the control plane manages communication between devices, while the data plane handles traffic flow. Demonstrate knowledge of how to configure, Monitor, or Troubleshoot VXLAN.

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Juniper Data Center, Professional (JNCIP-DC) Sample Questions (Q74-Q79):

NEW QUESTION # 74
Which two statements are correct about storm control in a Junos EVPN-VXLAN fabric? (Choose two.)

Answer: A,B

Explanation:
Storm control is a Layer 2 feature that monitors broadcast, unknown unicast, and multicast (BUM) traffic levels on an interface and takes a configured action, such as dropping excess traffic or disabling the interface, when a defined threshold is exceeded. This protects the fabric from broadcast storms but does not replace the Designated Forwarder election process, which handles duplicate BUM traffic delivery in multihomed scenarios.


NEW QUESTION # 75
In your EVPN-VXAN environment, you want to prevent a multihomed server from receiving multiple copies of BUM traffic in active/active scenarios. Which EVPN route type would satisfy this requirement?

Answer: D

Explanation:
In an EVPN-VXLAN environment with active-active multihoming, a multihomed server connected to multiple leaf switches can receive duplicate copies of BUM (Broadcast, Unknown Unicast, and Multicast) traffic. To prevent this, Type 4 (Ethernet Segment Route) is used.
EVPN Type 4 routes are responsible for DF (Designated Forwarder) election, which ensures that only one leaf switch forwards BUM traffic to the multihomed server. This prevents duplicate frames and optimizes network efficiency.


NEW QUESTION # 76
What are three actions available for MAC move limiting? (Choose three.)

Answer: B,C,E

Explanation:
MAC move limiting is a security feature used in network switches to detect and mitigate rapid changes in MAC address locations, which could indicate a network issue or an attack such as MAC flapping or spoofing.
When a MAC address is learned on a different interface than it was previously learned, the switch can take various actions to prevent potential issues.
drop: This action drops packets from the MAC address if it violates the move limit, effectively blocking communication from the offending MAC address.
log: This action logs the MAC move event without disrupting traffic, allowing network administrators to monitor and investigate the event.
shutdown: This action shuts down the interface on which the MAC address violation occurred, effectively stopping all traffic on that interface to prevent further issues.


NEW QUESTION # 77
You manage an IP fabric with an EVPN-VXLAN overlay. You have multiple tenants separated using multiple unique VRF instances. You want to determine the routing information that belongs in each routing instance's routing table.
In this scenario, which property is used for this purpose?

Answer: B

Explanation:
* Understanding VRF and Routing Instances:
* In an EVPN-VXLAN overlay network, multiple tenants are separated using unique VRF (Virtual Routing and Forwarding) instances. Each VRF instance maintains its own routing table, allowing for isolated routing domains within the same network infrastructure.
* Role of Route Distinguisher:
* Route Distinguisher (RD):The RD is a unique identifier used in MPLS and EVPN environments to distinguish routes belonging to different VRFs. The RD is prepended to the IP address in the route advertisement, ensuring that routes from different tenants remain unique even if they use the same IP address range.
* Correct Property:
* D. the route distinguisher value:This is the correct answer because the RD is crucial in determining which routing information belongs to which VRF instance. It ensures that each VRF' s routing table only contains relevant routes, maintaining isolation between tenants.
Data Center References:
* The RD is a key element in MPLS and EVPN-based multi-tenant environments, ensuring proper routing segregation and isolation for different VRFs within the data center fabric.


NEW QUESTION # 78
Which statement is correct about a collapsed fabric EVPN-VXLAN architecture?

Answer: D

Explanation:
Border gateway functions occur on border leaf devices: In a collapsed fabric EVPN-VXLAN architecture, the border leaf devices are responsible for interconnecting the data center to external networks (such as the WAN or other data centers). These devices perform the border gateway functions, such as handling routing and bridging for external communication.


NEW QUESTION # 79
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