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Juniper JN0-683 Exam Syllabus Topics:

Topic	Details
Topic 1	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 2	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.
Topic 3	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 (Q42-Q47):

NEW QUESTION # 42
Which two statements are true about IP fabrics using unnumbered BGP? (Choose two.)

A. Unnumbered BGP requires that family inet6 is configured on each interface.
B. Unnumbered BGP peering automatically provisions IPv4 peering.
C. Unnumbered BGP requires that family inet is configured on each interface.
D. Unnumbered BGP peering automatically provisions IPv6 peering.

Answer: A,B

Explanation:
https://www.juniper.net/documentation/us/en/software/nce/nce-225-bgp-unnumbered/index.html

NEW QUESTION # 43
Why is a designated forwarder required in a multihomed CE-to-PE VXLAN environmentusing EVPN signalling?

A. The designated forwarder is required to prevent a traffic storm from being received on 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 flooding of MAC addresses to 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 # 44
Click the Exhibit button.

The 192.168.0.0/24 route is being advertised into your IP fabric by the leaf devices in AS 65511 and AS 65512. Both spine devices receive the routes from each of the leaf devices.
In this scenario, which two statements are correct? (Choose two.)

A. By default, each spine device will only accept the first received next hop for this route from the leaf devices, while the other next hop will be rejected.
B. By default, each spine device will advertise both route entries for this route to other leaf devices.
C. By default, each spine device will accept both next hops for the route received from the leaf devices, but only one next hop will become the active route.
D. By default, each spine device will advertise only the active route entry to the other leaf devices.

Answer: A,D

Explanation:
The two advertisements for the same prefix arrive with different next hops, but the default BGP behavior in Junos is to select a single best path for installation; additional paths are not kept as usable next hops unless multipath is explicitly enabled, so the nonselected next hop is not used.
Also, Junos will not advertise routes to BGP peers unless an export policy explicitly permits them; when it does export, it advertises only the selected active route, not multiple equal candidates.

NEW QUESTION # 45
Click the Exhibit button. A VXLAN tunnel has been created between leaf1 and leaf2 in your data center.

Referring to the exhibit, which statement is correct?

A. Traffic sent from server1 to server2 will be dropped on Ieaf2.
B. Traffic sent from server1 to server2 will be dropped on leaf1.
C. Traffic sent from server1 to server2 will be tagged with VLAN ID 200 on Ieaf2 and forwarded to server2.
D. Traffic sent from server1 to server2 will be tagged with VLAN ID 100 on Ieaf2 and forwarded to server2.

Answer: B

Explanation:
D is correct because leaf1, the ingress switch, drops the traffic due to lack of EVPN L2 forwarding entry for destination MAC in a different VNI.

NEW QUESTION # 46
You are preparing an sFlow monitoring system configuration. In this scenario, what Information will be included in the datagram sent to the sFlow collector? (Choose two.)

A. the CRC from the sampled packet
B. the source and destination VLAN for sampled packets
C. the sending device's serial number
D. the interlace through which the packets entered the agent

Answer: B,D

Explanation:
sFlow is a packet sampling technology used to monitor traffic in a network. It sends sampled packet data and interface counters to an sFlow collector, which analyzes the traffic patterns.
Option A: The datagram sent to the sFlow collector includes information about the interface through which the packets entered the agent (the switch or router). This is crucial for understanding where in the network the traffic was captured.
Option D: sFlow datagrams also include the source and destination VLAN for the sampled packets. This allows for detailed analysis of the traffic flow within different VLANs.

NEW QUESTION # 47
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