Useful Free Sample JN0-683 Questions - Pass JN0-683 Exam

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Juniper JN0-683 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Data Center Architecture and Security	5%	- Security features in data center networks - Traffic protection and segmentation
Topic 2: Layer 3 Fabrics	20%	- IP fabric architecture and design - Fabric scaling and high availability - Routing protocols in IP fabrics
Topic 3: Data Center Deployment and Management	20%	- Software upgrades and management - Zero Touch Provisioning (ZTP) - Configuration management and automation
Topic 4: VXLAN	20%	- VXLAN troubleshooting - VXLAN configuration and monitoring - VXLAN control plane and data plane operation
Topic 5: Data Center Interconnect	15%	- Inter-fabric stitching - Layer 2 and Layer 3 interconnect - EVPN-VXLAN based DCI
Topic 6: EVPN-VXLAN Signaling	20%	- EVPN concepts and route types - MBGP for EVPN - CRB and ERB architectures - MAC learning and symmetric routing

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Juniper Data Center, Professional (JNCIP-DC) Sample Questions (Q88-Q93):

NEW QUESTION # 88
Why is a designated forwarder required in a multihomed CE-to-PE VXLAN environmentusing EVPN signalling?

A. The designated forwarder is required to prevent flooding of MAC addresses to multihomed hosts.
B. The designated forwarder is required to prevent duplicate packets from being received on multihomed hosts.
C. The designated forwarder is required to prevent a traffic storm from being received on multihomed hosts.
D. The designated forwarder is required to prevent packets from looping between the PEs.

Answer: B

Explanation:
* Understanding Multihomed CE-to-PE VXLAN Environment:
* In a VXLAN environment using EVPN signaling, multiple PEs (Provider Edge devices) can be connected to the same CE (Customer Edge device). This setup is referred to as multihoming, where a CE device has multiple connections to the network to ensure redundancy and load balancing.
* Role of the Designated Forwarder:
* The designated forwarder (DF) is a mechanism used in EVPN to manage the forwarding of broadcast, unknown unicast, and multicast (BUM) traffic in a multihomed environment. The DF is selected to ensure that only one of the PEs forwards this type of traffic to the CE, preventing loops and unnecessary duplicate packets.
* Avoiding Duplicate Packets:
* Without a designated forwarder, all PEs connected to a multihomed CE could potentially forward the same packet to the CE, resulting in duplicate packets. This duplication can cause issues with packet processing on the CE, leading to inefficiencies and potential network problems.
Conclusion:
* Option D:Correct-The designated forwarder is essential to prevent duplicate packets from being received on multihomed hosts, ensuring that only one PE forwards BUM traffic to the CE.

NEW QUESTION # 89
Which statement is correct regarding ESI-LAG multihoming in an EVPN-VXLAN fabric?

A. Each multihomed device must be assigned a unique Ethernet Segment Identifier per leaf.
B. ESI-LAG requires a dedicated MC-LAG peer link between leaf devices.
C. ESI-LAG can only operate in single-active mode.
D. The same Ethernet Segment Identifier is configured on all leaf devices connected to the same multihomed CE device.

Answer: D

Explanation:
When a customer edge (CE) device is multihomed to two or more leaf devices using ESI-LAG, all the leaf devices attached to that segment must be configured with the identical Ethernet Segment Identifier (ESI). This common ESI allows the leaf devices to recognize they share the same Ethernet segment and to coordinate designated forwarder election and traffic load balancing, typically in all-active mode, without needing a separate peer link as MC-LAG requires.

NEW QUESTION # 90
Which statement correctly describes the role of EVPN Type 3 routes?

A. They advertise the VTEP's participation in a given VNI for BUM traffic replication using ingress replication.
B. They advertise host MAC and IP binding information.
C. They advertise IP prefixes for inter-VXLAN routing.
D. They advertise Ethernet Segment membership for multihomed devices.

Answer: A

Explanation:
EVPN Type 3 routes, known as Inclusive Multicast Ethernet Tag routes, are used to build the flooding tree for broadcast, unknown unicast, and multicast traffic within a given VNI. Each VTEP advertises a Type 3 route indicating its participation in a VNI, allowing remote VTEPs to learn where to send BUM traffic when using ingress replication instead of a multicast-based underlay.

NEW QUESTION # 91
You are configuring an EVPN-VXLAN fabric with an edge-routed bridging (ERB) overlay. Where does Layer 3 routing occur in this architecture?

A. At the spine devices only.
B. At a centralized route reflector.
C. At the server leaf (top-of-rack) devices.
D. At the border leaf devices only.

Answer: C

Explanation:
In an edge-routed bridging (ERB) overlay, the integrated routing and bridging (IRB) interfaces and Layer 3 gateway functionality are placed directly on the server leaf devices, moving routing as close to the endpoints as possible. This reduces the need to hairpin traffic through the spine and improves east-west traffic efficiency compared to a centrally-routed bridging (CRB) design.

NEW QUESTION # 92
Which two statements are correct about EVPN Type 1 routes? (Choose two.)

A. They are used for MAC address learning between leaf devices.
B. They advertise IP-to-MAC bindings for ARP suppression.
C. They are used to signal Ethernet Segment Route information.
D. They enable fast convergence during a link failure by triggering mass withdrawal.

Answer: C,D

Explanation:
EVPN Type 1 routes, also called Ethernet Auto-Discovery (AD) routes, are advertised per Ethernet Segment and per EVI. They allow a PE device to signal information about a locally attached Ethernet Segment, and when a link to a multihomed segment fails, a single Type 1 route withdrawal (mass withdrawal) can quickly inform remote PEs to redirect traffic, significantly speeding up convergence compared to withdrawing individual MAC routes.

NEW QUESTION # 93
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