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[General] JN0-683 Prep4sure, JN0-683 network simulator review

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【General】 JN0-683 Prep4sure, JN0-683 network simulator review

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Juniper JN0-683 Exam Syllabus Topics:
TopicDetails
Topic 1
  • 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 2
  • Data Center Multitenancy and Security: This section tests knowledge of single-tenant and multitenant data center setups. Candidates such as Data Center Professionals are evaluated on ensuring tenant traffic isolation at both Layer 2 and Layer 3 levels in shared infrastructure environments.
Topic 3
  • 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 4
  • Data Center Interconnect: For Data Center Engineers, this part focuses on interconnecting data centers, covering Layer 2 and Layer 3 stretching, stitching fabrics together, and using EVPN-signaled VXLAN for seamless communication between data centers.
Topic 5
  • 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.

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Juniper Data Center, Professional (JNCIP-DC) Sample Questions (Q68-Q73):NEW QUESTION # 68
You are deploying a Clos IP fabric with an oversubscription ratio of 3:1.
In this scenario, which two statements are correct? (Choose two.)
  • A. The oversubscription ratio remains the same when you add spine devices.
  • B. The oversubscription ratio remains the same when you remove spine devices.
  • C. The oversubscription ratio increases when you remove spine devices.
  • D. The oversubscription ratio decreases when you add spine devices.
Answer: C,D
Explanation:
The oversubscription ratio is the ratio of edge (leaf) bandwidth to core (spine) bandwidth.
When you add spine devices, the total available core bandwidth increases, which reduces (decreases) the oversubscription ratio.
When you remove spine devices, the total core bandwidth decreases while edge bandwidth remains the same, causing the oversubscription ratio to increase.

NEW QUESTION # 69
What are three actions available for MAC move limiting? (Choose three.)
  • A. drop
  • B. enable
  • C. log
  • D. shutdown
  • E. filter
Answer: A,C,D
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 # 70
Exhibit.

You have implemented an EVPN-VXLAN data center. Device served must be able to communicate with device server2.
Referring to the exhibit, which two statements are correct? (Choose two.)
  • A. An IRB Interface must be configured on leaf1 and Ieaf2.
  • B. Traffic from server1 to server2 will transit a VXLAN tunnel to spinel or spine2. then a VXLAN tunnel from spinel or spine2 to Ieaf2.
  • C. An IRB interface must be configured on spinel and spine2.
  • D. Traffic from server! to server2 will transit the VXLAN tunnel between leaf1 and Ieaf2.
Answer: A,D
Explanation:
* Understanding the Exhibit Setup:
* The network diagram shows an EVPN-VXLAN setup, a common design for modern data centers enabling Layer 2 and Layer 3 services over an IP fabric.
* Leaf1 and Leaf2 are the leaf switches connected to Server1 and Server2, respectively, with each server in a different subnet (172.16.1.0/24 and 172.16.2.0/24).
* Spine1 and Spine2 are part of the IP fabric, interconnecting the leaf switches.
* EVPN-VXLAN Basics:
* EVPN (Ethernet VPN) provides Layer 2 and Layer 3 VPN services using MP-BGP.
* VXLAN (Virtual Extensible LAN) encapsulates Layer 2 frames into Layer 3 packets for transmission across an IP network.
* VTEP (VXLAN Tunnel Endpoint) interfaces on leaf devices handle VXLAN encapsulation and decapsulation.
* Integrated Routing and Bridging (IRB):
* IRB interfaces are required on leaf1 and leaf2 (where the endpoints are directly connected) to route between different subnets (in this case, between 172.16.1.0/24 and 172.16.2.0/24).
* The IRB interfaces provide the necessary L3 gateway functions for inter-subnet communication.
* Traffic Flow Analysis:
* Traffic from Server1 (172.16.1.1) destined for Server2 (172.16.2.1) must traverse from leaf1 to leaf2.
* The traffic will be VXLAN encapsulated on leaf1, sent over the IP fabric, and decapsulated on leaf2.
* Since the communication is between different subnets, the IRB interfaces on leaf1 and leaf2 are crucial for routing the traffic correctly.
* Correct Statements:
* C. An IRB Interface must be configured on leaf1 and leaf2:This is necessary to perform the inter-subnet routing for traffic between Server1 and Server2.
* D. Traffic from server1 to server2 will transit the VXLAN tunnel between leaf1 and leaf2:
This describes the correct VXLAN operation where the traffic is encapsulated by leaf1 and decapsulated by leaf2.
Data Center References:
* In EVPN-VXLAN architectures, the leaf switches often handle both Layer 2 switching and Layer 3 routing via IRB interfaces. This allows for efficient routing within the data center fabric without the need to involve the spine switches for every routing decision.
* The described traffic flow aligns with standard EVPN-VXLAN designs, where direct VXLAN tunnels between leaf switches enable seamless and scalable communication across a data center network.

NEW QUESTION # 71
Given the configuration shown in the exhibit, why has the next hop remained the same for the EVPN routes advertised to the peer 203.0.113.2?

  • A. The vpn-apply-export parameter must be applied to this peer.
  • B. The vrf-export parameter must be applied.
  • C. The export policy is incorrectly configured.
  • D. EVPN routes cannot have the next hop changed.
Answer: A
Explanation:
The vpn-apply-export parameter must be applied to this peer: In the given configuration, the policy statement CHANGE_NHis defined to change the next-hop IP for routes. However, the vpn- apply-exportparameter is missing, which is necessary for applying export policies to routes associated with a particular VPN. Without this parameter, the export policy does not apply to the EVPN routes, and thus the next-hop remains unchanged.

NEW QUESTION # 72
Referring to the exhibit, the spine1 device has an underlay BGP group that in configured to peer with its neighbors' directly connected interfaces.
Which two statements are true in this scenario? (Choose two.)

  • A. Load balancing for the underlay is configured correctly.
  • B. The multihop statement is not required to establish the underlay BGP sessions.
  • C. Load balancing for the underlay is not configured correctly.
  • D. The multihop statement is required to establish the underlay BGP sessions.
Answer: A,B
Explanation:
The multihop statement is not required to establish the underlay BGP sessions: In this scenario, the BGP peering is done with directly connected neighbors, so the multihop statement is not necessary. The multihop statement is typically used when BGP peers are not directly connected and are separated by intermediate devices. Since the peering is established directly between spine1 and the other devices, no multihop configuration is needed.
Load balancing for the underlay is configured correctly: The configuration shows the use of multipath with the multiple-as option, which enables ECMP (Equal-Cost Multi-Path) load balancing for the underlay network. This configuration allows for traffic to be distributed across multiple paths to the BGP neighbors, assuming multiple equal-cost paths exist, and the multiple- as option enables the use of multiple autonomous systems for load balancing.

NEW QUESTION # 73
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