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To prevent inter-tenant communication while reusing the same contract, the contract should be created in the user tenant with the scope set to VRF and then exported to other tenants. This approach allows the contract to be shared across tenants while maintaining the isolation of each tenant’s VRF. By setting the scope to VRF, the contract’s policies apply only within the context of the specified VRF, thus preventing communication between tenants5678.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

 To prevent connectivity issues for EP1 when accessing an external L3Out network, it’s essential to enable IP data plane learning for the VRF and unicast routing in BD-BD2. IPdata plane learning allows dynamic endpoint learning within a VRF, ensuring accurate forwarding information for EP1. Unicast routing enables packet routing based on destination IP, facilitating proper traffic routing through the gateway.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

 To set up the link between the spine and the IPN device in a Cisco ACI Multi-Pod, the following actions should be taken: A. Enable MP-BGP routing to facilitate the exchange of routing information. B. Enable BIDIR-PIM protocol to support efficient multicast traffic forwarding. D. Enable OSPF routing to ensure dynamic routing between the spine and IPN devices.

 In Cisco ACI fabric, when a Layer 2 unknown unicast packet is encountered, the fabric does not drop the packet. Instead, it uses a flooding mechanism to ensure that the packet reaches its potential destination. This is achieved by utilizing the VRF (Virtual Routing and Forwarding) Outer Multicast Group ID associated with the Bridge Domain (BD) to which the unknown destination MAC address belongs. By doing so, Cisco ACI ensures that all endpoints within the BD have an opportunity to receive and process the packet if they are indeed the intended recipient. References: Implementing Cisco Application Centric Infrastructure Official Cert Guide

To address resource overconsumption on a border leaf switch, migrating L3Outs to another switch can help distribute the load and reduce strain on the affected switch.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

In a two-site Multi-Pod deployment with an active/standby firewall pair stretched across pods, traffic is directed to the pod with the active service node. This approach ensures that all traffic goes through the firewall that is currently handling traffic, maintaining security policies consistently across both sites while also providing high availability by automatically failing over to the standby firewall in case of any issues with the active one. References := ( Implementing Cisco Application Centric Infrastructure Official Cert Guide )

When Server A is connected to the Cisco ACI fabric using teamed interfaces with one active and one standby interface, enabling ARP flooding ensures that the ACI fabric can learn about the new active interface after a failover. This allows for seamless communication continuity even when the standby interface becomes active and starts sending traffic with its built-in MAC address.

 In Cisco ACI, contracts are used to define the policies that govern communication between End Point Groups (EPGs). A contract specifies which types of traffic are permitted or denied between EPGs. To allow all IP traffic except SSH, you would configure the contract to permit all IP traffic and then deny SSH specifically. This is typically done by defining filters within the contract that match on the SSH protocol and setting the action to deny.

References:

Implementing Cisco Application Centric Infrastructure - Advanced (DCACIA) course materials and official certification guide can provide more detailed information on this topic12.

Cisco’s official documentation and training materials are also a good resource for understanding the configuration and management of contracts in ACI

 Deploying a new Cisco ACI Multi-Pod setup involves configuring the TEP pool of the new pod to be routable across the IPN (B) and increasing the interface MTU on all IPN routers to support VXLAN traffic (D). Configuring anycast RP (A) and MP-BGP on IPN routers © are not specific actions for deploying a Multi-Pod setup. Connecting all spines to the IPN (E) is not a required action for deployment3. References := (ACI Multi-Pod White Paper

 To advertise routes from border leaf switches to compute leaf switches in a shared services scenario, the shared L3Out should be defined in the common tenant. This allows all tenants to access the shared services provided by the L3Out. By configuring the L3Out in the common tenant, routes can be advertised to the compute leaf switches, ensuring that the services are available across the ACI fabric.

References: Implementing Cisco Application Centric Infrastructure Official Cert Guide