QUESTION: 29

You are asked to interconnect two of your company's data centers across an IP backbone. Both data centers require Layer 2 and Layer 3 connectivity. In this scenario, which three actions would accomplish this task? (Choose three.)

Advertise Type 2 EVPN routes across the DCI.
Ensure border leaf nodes in each data center can exchange EVPN routes.
Ensure there is a full mesh of VTEPs between all spine nodes within both data centers.
Advertise Type 5 EVPN routes across the DCI.
Ensure there is a full mesh of VTEPs between all leaf nodes within data centers.

Answer(s): A,B,D

Explanation:

Layer 2 and Layer 3 Connectivity Requirements:
To interconnect two data centers across an IP backbone with both Layer 2 (L2) and Layer 3 (L3) connectivity, EVPN-VXLAN (Ethernet VPN with Virtual Extensible LAN) is the ideal solution. EVPN supports L2 VPNs while also enabling L3 connectivity across multiple locations.
Necessary EVPN Route Types:
Type 2 EVPN Routes: These routes are used to advertise MAC addresses for Layer 2 connectivity. They are essential for enabling seamless L2 communication across data centers. Type 5 EVPN Routes: These routes are necessary for advertising IP prefixes for Layer 3 connectivity between data centers. They enable the exchange of L3 information across the IP backbone, ensuring routed traffic can reach its destination.
Border Leaf Nodes:
Border Leaf Nodes: Ensuring that the border leaf nodes (the entry and exit points for traffic between data centers) can exchange EVPN routes is critical for the correct dissemination of both L2 and L3 information across the data centers.
Conclusion:
Option A: Correct--Type 2 EVPN routes are required for Layer 2 MAC address learning and communication across the DCI (Data Center Interconnect). Option B: Correct--Border leaf nodes need to exchange EVPN routes to maintain connectivity between data centers.
Option D: Correct--Type 5 EVPN routes are essential for Layer 3 connectivity across the DCI. Options C and E are incorrect because they refer to establishing full mesh VTEPs (VXLAN Tunnel Endpoints) across all spine or leaf nodes, which is unnecessary for the scenario provided. The focus should be on border leaf nodes and appropriate route advertisements for L2 and L3 connectivity.

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QUESTION: 30

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?

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

Answer(s): C

Explanation:

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.
Options A, B, and D introduce 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: 31

You are asked to identify microburst traffic occurring in the network leading lo packet drops in your data center switches Which two tools would be used in this scenario? (Choose two.)

port mirroring
Traceoptions
port buffer monitoring
syslog

Answer(s): A,C

Explanation:

Identifying Microburst Traffic:
Microbursts are short spikes in network traffic that can overwhelm buffers and cause packet drops. Detecting and analyzing microbursts is crucial for understanding where packet loss might be occurring in a data center network.
Port Buffer Monitoring:
Port Buffer Monitoring: This tool specifically tracks the usage of switch buffers, helping to identify when microbursts are causing buffers to overflow, leading to packet drops.
Port Mirroring:
Port Mirroring: This tool allows you to monitor real-time traffic on a specific port by copying the traffic to another port where it can be analyzed, often with a packet analyzer.
While port mirroring doesn't directly detect microbursts, it helps capture traffic patterns that can indicate microbursts.
Conclusion:
Option C: Correct--Port buffer monitoring directly identifies buffer overflows caused by microbursts. Option A: Correct--Port mirroring allows for the detailed capture and analysis of traffic patterns, which can reveal microburst behavior.
Options B (Traceoptions) and D (Syslog) are less effective in identifying microburst traffic.

Traceoptions focus on control plane traffic debugging, and Syslog is more about logging system events than detecting high-frequency traffic spikes.

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QUESTION: 32

Exhibit.

Both DC and DC2 ate using EVPN-VXLAN technology deployed using an ERB architecture. A server on the Red VLAN must communicate with a server on the Green VLAN. The Blue VLAN in DC and DC2 needs to be the same VLAN.
Which statement is correct in this scenario?

The eight spine devices must be configured as border spine devices; a full mush interconnect must exist between all eight spine devices and the Blue VLAN must be stitched together
An interconnect is required between the four SRX Series devices; the Blue VLAN must be stretched and a transit VNI must be added for the Red and Green VLANs.
An interconnect is required between four leaf devices in the services blocks; the Red VLAN and the Green VLAN must be stitched and the Blue VLAN must be stretched.
A lean super spine device must be added to DC and DC2; all VLANs must be stretched to the lean super spine device and the lean super spine devices must stitch all the VLANs together.

Answer(s): B

Explanation:

ERB Architecture in EVPN-VXLAN:

ERB (Edge Routed Bridging) architecture is commonly used in data center networks where routing decisions are made at the network edge (leaf or border devices), while bridging (Layer 2 forwarding) is extended across the fabric. This architecture allows for efficient L3 routing while still enabling L2 services like VLANs to span across multiple locations.
VLAN and VNI Configuration:
The scenario specifies that a server on the Red VLAN needs to communicate with a server on the Green VLAN. Since these VLANs are in different data centers (DC and DC2), and given the use of EVPN-VXLAN, the communication between these VLANs will require a transit VNI (Virtual Network Identifier). This transit VNI will allow traffic to traverse the VXLAN tunnel across the DCI (Data Center Interconnect).
Interconnect between SRX Series Devices:

The exhibit shows SRX Series Chassis Clusters used as service devices (likely for firewalling or other security services). These devices need to be interconnected between the two data centers to ensure that VLANs can communicate effectively. The Blue VLAN needs to be stretched between DC and DC2 to maintain the same Layer 2 domain across both data centers.
Conclusion:
Option B: Correct--Interconnecting the SRX Series devices will ensure the necessary service chaining, while stretching the Blue VLAN and adding a transit VNI for the Red and Green VLANs will enable the required communication across the data centers.

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