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Juniper JN0-683 Exam Sample Questions

Question # 1

You are asked to build redundant gateways in your EVPN-VXLAN environment, but you must conserve address space because these gateways must span across seven PES. What should you implement on the PEs lo satisfy these requirements?

A. Use IRB interfaces with the same IP address and different MAC addresses.

B. Use IRB interfaces with the same IP and VGA.

C. Use IRB interfaces with the same IP and MAC address.

D. Use IRB interfaces with different IP addresses and the same VGA.

Answer

C. Use IRB interfaces with the same IP and MAC address.

Redundant Gateways in EVPN-VXLAN:

In an EVPN-VXLAN environment, providing redundant gateway functionality typically involves the use of Anycast Gateway. This allows multiple PEs (Provider Edge devices) to use the same IP address and MAC address for the gateway, enabling seamless failover and redundancy without IP conflicts.

Conserving Address Space:

Using the same IP address across multiple PEs conserves address space because only one IP address is needed for the gateway function, regardless of the number of PEs. The shared MAC address ensures that ARP resolution and forwarding behavior are consistent across all the PEs.

Conclusion:

Option C:Correct—Using IRB interfaces with the same IP and MAC address across all PEs satisfies the need for redundancy while conserving address space.

OptionsA, B,andDintroduce unnecessary complexity or do not fully utilize the efficient Anycast Gateway approach, which is best practice for conserving IP space and providing redundancy.

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Question # 2

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

A. Type 8

B. Type 7

C. Type 4

D. Type 5

Answer

C. Type 4

Explanation:

Understanding the Scenario:

In an EVPN-VXLAN environment, when using multi-homing in active/active scenarios, there's a risk that a multihomed server might receive duplicate copies of Broadcast, Unknown unicast, and Multicast (BUM) traffic. This is because multiple VTEPs might forward the same BUM traffic to the server.

EVPN Route Types:

Type 4 Route (Ethernet Segment Route):This route type is used to advertise the Ethernet Segment (ES) to which the device is connected. It is specifically used in multi-homing scenarios to signal the ES and its associated Ethernet Tag to all the remote VTEPs. The Type 4 route includes information that helps prevent BUM traffic duplication in active/active multi-homing by using a split-horizon mechanism, which ensures that traffic sent to a multihomed device does not get looped back.

Explanation:

The Type 4 route is crucial for ensuring that in a multi-homed setup, particularly in an active/active configuration, BUM traffic does not result in duplication at the server. The route helps coordinate which VTEP is responsible for forwarding the BUM traffic to the server, thereby preventing duplicate traffic.

Data Center References:

Type 4 routes are essential for managing multi-homing in EVPN to avoid the issues of BUM traffic duplication, which could otherwise lead to inefficiencies and potential network issues.

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Question # 3

You are asked to interconnect Iwo data centers using a method that provides EVPN Type 2 connectivity, is highly scalable, and limits VXLAN tunnels between border leafdevices. What will satisfy these requirements?

A. over the top full-mesh interconnect

B. EVPN Type 2 stretch

C. IP VPN

D. Type 2 seamless stitching

Answer

D. Type 2 seamless stitching

Explanation:

Requirement Analysis:

The scenario requires a solution to interconnect two data centers that supports EVPN Type 2 connectivity. The solution must be highly scalable and must minimize the number of VXLAN tunnels between border leaf devices.

Understanding Type 2 Seamless Stitching:

Option D:Type 2 seamless stitchingis a method used in EVPN to provide Layer 2 connectivity (such as MAC address mobility) across different VXLAN segments. It is scalable because it allows only necessary tunnels to be established between border leaf devices, reducing the overhead of maintaining a full mesh of VXLAN tunnels.

Conclusion:

Option D:Correct—Type 2 seamless stitching satisfies the requirement by enabling scalable, efficient interconnection of two data centers with minimal VXLAN tunnels.

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Question # 4

Which three statements are correct about symmetric IRB routing with EVPN Type 2 routes? (Choose three.)

A. An L3 interface (IRB) is required for each local VLAN.

B. Symmetric routing requires MAC-VRF.

C. Symmetric routing supports the EVPN service VLAN bundle.

D. Symmetric routing requires an extra transit VNI for each VRF.

E. Symmetric routing is less efficient than asymmetric routing.

Answer

A. An L3 interface (IRB) is required for each local VLAN.
B. Symmetric routing requires MAC-VRF.
D. Symmetric routing requires an extra transit VNI for each VRF.

Symmetric IRB Routing with EVPN Type 2 Routes:

Symmetric Routing: In symmetric IRB (Integrated Routing and Bridging), routing occurs in both directions at the ingress and egress leaf nodes using the same routing logic. This is contrasted with asymmetric routing, where different routing logic is used depending on the direction of the traffic.

Required Components:

Option A:An L3 IRB interface is necessary for each VLAN that participates in routing, as it handles the Layer 3 processing for the VLAN.

Option B:MAC-VRF is required for symmetric routing to maintain a mapping of MAC addresses to the appropriate VRF, ensuring correct forwarding within the EVPN.

Option D:A transit VNI (Virtual Network Identifier) is required for each VRF to encapsulate the Layer 3 traffic as it traverses the network, allowing the IP traffic to be appropriately forwarded.

Conclusion:

Option A:Correct—Each local VLAN needs an IRB interface for L3 processing.
Option B:Correct—MAC-VRF is necessary for handling MAC address resolution in symmetric routing.
Option D:Correct—Transit VNIs are required for routing VRF-specific traffic across the network.
OptionsCandEare incorrect because:

C:Symmetric routing can work with various VLAN models, including single or multiple VLANs within an EVPN instance.
E:Symmetric routing is generally more efficient than asymmetric routing as it uses consistent routing logic in both directions.

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Question # 5

You are deploying an IP fabric with an oversubscription ratio of 3:1. In this scenario, which two statements are correct? (Choose two.)

A. The oversubscription ratio decreases when you add leaf devices.

B. The oversubscription ratio remains the same when you remove leaf devices.

C. The oversubscription ratio increases when you remove leaf devices.

D. The oversubscription ratio remains the same when you add leaf devices.

Answer

C. The oversubscription ratio increases when you remove leaf devices.
D. The oversubscription ratio remains the same when you add leaf devices.

Understanding Oversubscription Ratio in IP Fabrics:

The oversubscription ratio in an IP fabric typically refers to the ratio of the available bandwidth at the edge of the network (leaves) to the available bandwidth at the core or spine. A 3:1 oversubscription ratio means that for every 3 units of bandwidth at the leaves, there is 1 unit of bandwidth at the spine.

Impact of Adding or Removing Leaf Devices:

Removing Leaf Devices:When you remove leaf devices, the amount of total edge bandwidth decreases while the bandwidth in the spine remains constant. This causes the oversubscription ratio toincreasebecause there is now less total bandwidth to distribute across the same amount of spine bandwidth.

Adding Leaf Devices:Conversely, when you add leaf devices, the total edge bandwidth increases. Since the spine bandwidth remains the same, the oversubscription ratio would remain the same if the additional leaves consume their share of the available bandwidth proportionally.

Conclusion:

Option C:Correct—Removing leaf devices increases the oversubscription ratio.

Option D:Correct—Adding leaf devices typically maintains the oversubscription ratio assuming uniform bandwidth distribution.

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