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| Certification Vendor: | Juniper Networks |
|---|---|
| Exam Name: | Data Center, Professional (JNCIP-DC) Exam |
| Exam Number: | JN0-683 |
| Exam Price: | $400 USD |
| Exam Format: | Scenario-based, Multiple choice |
| Exam Duration: | 90 minutes |
| Related Certifications: | JNCIA-DC JNCIE-DC JNCIS-DC |
| Certificate Validity Period: | 3 years |
| Passing Score: | Variable (approx. 65%-70%) |
| Real Exam Qty: | 65 |
| Available Languages: | English |
| Recommended Training: | Juniper Learning Portal |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Juniper JN0-683 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE test centers |
| Pre Condition: | Valid JNCIS-DC or JNCIS-ENT certification |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification/tracks/data-center/jncip-dc.html |
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NEW QUESTION # 29
You are deploying a Clos IP fabric with an oversubscription ratio of 3:1.
In this scenario, which two statements are correct? (Choose two.)
Answer: C,D
Explanation:
* Understanding Oversubscription in a Clos Fabric:
* The oversubscription ratio in a Clos IP fabric measures the ratio of the amount of edge (leaf) bandwidth to the core (spine) bandwidth. An oversubscription ratio of 3:1 means that there is three times more edge bandwidth compared to core bandwidth.
* Impact of Adding/Removing Spine Devices:
* Option C:If youremove spine devices, the total available core bandwidth decreases, while the edge bandwidth remains the same. This results in anincrease in the oversubscription ratio because there is now less core bandwidth to handle the same amount of edge traffic.
* Option B:Conversely, if youadd spine devices, the total core bandwidth increases. This decreases the oversubscription ratio because more core bandwidth is available to handle the edge traffic.
Conclusion:
* Option C:Correct-Removing spine devices increases the oversubscription ratio.
* Option B:Correct-Adding spine devices decreases the oversubscription ratio.
NEW QUESTION # 30
Which two statements are true about a pure IP fabric? (Choose two.)
Answer: A,D
Explanation:
An IP fabric does not support Layer 2 protocols: A pure IP fabric is designed to work primarily at Layer 3 and does not require Layer 2 protocols like spanning tree or VLANs for operation. It focuses on IP-based routing and forwarding, and Layer 2 protocols are not typically used within the fabric itself.
Devices in an IP fabric function as Layer 3 routers: In a pure IP fabric, devices (typically leaf and spine switches) operate primarily as Layer 3 routers. They are responsible for routing IP traffic across the fabric, with VXLAN or other tunneling technologies used for overlay and encapsulation.
NEW QUESTION # 31
Which three statements are correct about symmetric IRB routing with EVPN Type 2 routes?
(Choose three.)
Answer: B,C,D
Explanation:
An L3 interface (IRB) is required for each local VLAN: In symmetric IRB (Integrated Routing and Bridging) routing with EVPN Type 2 routes, an L3 interface (IRB) is needed for each VLAN in the local network. This interface provides the Layer 3 connectivity for the local VLANs and allows routing between bridged domains.
Symmetric routing requires MAC-VRF: Symmetric routing typically requires the use of MAC- VRF (MAC address VPN), which enables the device to route traffic while maintaining both Layer
2 and Layer 3 information. This ensures that both bridged and routed traffic are handled efficiently.
Symmetric routing requires an extra transit VNI for each VRF: It requires an extra transit VNI (a Layer 3 VNI) per VRF that carries routed (Layer 3) traffic across the VXLAN fabric.
NEW QUESTION # 32
A local VTEP has two ECMP paths to a remote VTEP
Which two statements are correctwhen load balancing is enabled in this scenario? (Choose two.)
Answer: C,D
Explanation:
* Load Balancing in VXLAN:
* VXLAN uses UDP encapsulation to transport Layer 2 frames over an IP network. For load balancing across Equal-Cost Multi-Path (ECMP) links, various fields in the packet can be used to ensure even distribution of traffic.
* Key Load Balancing Fields:
* C. The source port in the UDP header is used to load balance VXLAN traffic:This is correct.
The source UDP port in the VXLAN packet is typically calculated based on a hash of the inner packet's fields. This makes the source port vary between packets, enabling effective load balancing across multiple paths.
* D. The inner packet fields are used in the hash for load balancing:This is also correct. Fields such as the source and destination IP addresses, source and destination MACaddresses, and possibly even higher-layer protocol information from the inner packet can be used to generate the hash that determines the ECMP path.
* Incorrect Statements:
* A. The inner packet fields are not used in the hash for load balancing:This is incorrect as the inner packet fields are indeed critical for generating the hash used in load balancing.
* B. The destination port in the UDP header is used to load balance VXLAN traffic:This is incorrect because the destination UDP port in VXLAN packets is typically fixed (e.g., port 4789 for VXLAN), and therefore cannot be used for effective load balancing.
Data Center References:
* Effective load balancing in VXLAN is crucial for ensuring high throughput and avoiding congestion on specific links. By using a combination of the source UDP port and inner packet fields, the network can distribute traffic evenly across available paths.
NEW QUESTION # 33
Why is a designated forwarder required in a multihomed CE-to-PE VXLAN environmentusing EVPN signalling?
Answer: C
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 # 34
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