Question # 1
You are designing a Layer 3 fabric underlay using EBGP. You will implement an EVPN-signaled VXLAN overlay on the Layer 3 fabric.
In this scenario, what must you do in the underlay to ensure that the VXLAN overlay will be able to function properly? | | A. The underlay should advertise the host-connected interfaces on all leaf devices. | | B. Each device in the underlay should advertise its loopback address. | | C. The underlay should be configured with a separate VRF for each potential tenant. | | D. The underlay should support the PIM protocol. |
B. Each device in the underlay should advertise its loopback address.
Question # 2
| You are asked to implement VXLAN group-based policies (GBPs) in your data center. Which two statements are correct in (his scenario? (Choose two.) | | A. VXLAN GBP uses scalable group tags thatmust be configured statically on each switch and activated through 802.1X. | | B. VXLAN GBP uses scalable group tags that may be configured on a RADIUS server and pushed to the switch through 802.1X. | | C. VXLAN GBP ensures consistent application of security group policies throughout the network. | | D. VXLAN GBP ensures consistent application of BGP groups throughout the network. |
B. VXLAN GBP uses scalable group tags that may be configured on a RADIUS server and pushed to the switch through 802.1X.
C. VXLAN GBP ensures consistent application of security group policies throughout the network.
VXLAN Group-Based Policies (GBP):
VXLAN Group-Based Policies are used to apply security policies consistently across the network. These policies are often tied to user or device identities rather than static IP addresses, which allows for more dynamic and scalable security management.
Scalable Group Tags via RADIUS and 802.1X:
Option B:VXLAN GBP can use scalable group tags configured on a RADIUS server, which are then pushed to network devices through 802.1X. This allows for centralized and automated policy application based on user or device identity.
Consistent Security Policy Application:
Option C:GBP ensures that security policies are consistently applied across the network, regardless of where a user or device connects. This consistency is crucial in environments where security policies must follow the user or device.
Conclusion:
Option B:Correct—Group tags can be configured on a RADIUS server and pushed via 802.1X, enabling centralized policy management.
Option C:Correct—GBP ensures consistent application of security policies, which is essential for maintaining security across a dynamic network environment.
Question # 3
| You want to ensure thatVXLAN traffic from the xe-0/0/12 interlace is being encapsulatedby logical vlep.32770 and sent to a remote leaf device in this scenario, which command would you use to verify that traffic is flowing? | | A. monitor traffic interface xe-0/0/12 | | B. show interface terse vtep.32770 | | C. show interfaces terse vtep.32770 statistics | | D. show interfaces vtep.32770 detail |
C. show interfaces terse vtep.32770 statistics
VXLAN Traffic Verification:
To ensure VXLAN traffic from the xe-0/0/12 interface is correctly encapsulated by the logical vtep.32770 and sent to a remote leaf device, it is essential to monitor the relevant interface statistics.
The command show interfaces terse vtep.32770 statistics provides a concise overview of the traffic statistics for the specific VTEP interface, which can help verify whether traffic is being correctly encapsulated and transmitted.
Explanation:
This command is particularly useful for quickly checking the traffic counters and identifying any potential issues with VXLAN encapsulation or transmission.
It allows you to confirm that traffic is flowing as expected, by checking the transmitted and received packet counters.
Data Center References:
Monitoring interface statistics is a crucial step in troubleshooting and validating network traffic, particularly in complex overlay environments like EVPN-VXLAN.
Question # 4
| You are adding a server lo a tenant's network within your data center and must limit access to a specific traffic type within the tenant network without pushing all tenant traffic through a firewall.
What will satisfy this requirement? | | A. Use route leaking with EVPN and a routing policy. | | B. Use filter-based forwarding. | | C. Put the new server on a unique subnet within the tenant's network. | | D. Use a static route in the tenant VRF with a firewall as the next hop for traffic to the new server. |
B. Use filter-based forwarding.
Explanation:
Controlling Traffic Within a Tenant's Network:
The requirement is to limit access to specific traffic types within a tenant’s network without routing all tenant traffic through a firewall. This requires a selective method that can direct specific types of traffic to different paths based on the nature of the traffic.
Filter-Based Forwarding (FBF):
FBF is a technique that allows for routing decisions based on filters applied to the traffic, such as matching on source IP addresses, destination IP addresses, or even specific application types (like HTTP or FTP). This allows specific types of traffic to be forwardedto a specific next hop (e.g., a firewall) without affecting the entire traffic flow within the tenant's network.
Conclusion:
Option B:Correct—Filter-based forwarding allows for granular control of traffic, ensuring that only specific types of traffic within the tenant's network are redirected through a firewall, satisfying the requirement.
Question # 5
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 |
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.
Question # 6
| 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. |
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.
Question # 7
| You are configuring VXLAN, and you must ensure that all switches for the multicast groups advertise their existence and learn about other VTEPs.
In this scenario, which protocol will accomplish this task? | | A. OSPF | | B. BGP | | C. EVPN | | D. PIM |
C. EVPN
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