Protocol Independent Multicast sparse mode (PIM-SM) is designed for efficient routing to multiple receivers in a multicast group across an inter-pod network (IPN). PIM sparse mode is best suited for environments where receivers are dispersed because it allows for explicit join messages to control the flow of traffic. This makes it ideal for scenarios where broadcast, unknown unicast, and multicast flooding between Cisco ACI pods is required.  References  := ( Implementing Cisco Application Centric Infrastructure Official Cert Guide )

To redirect HTTP traffic between an EPG client and EPG server through a Cisco ASA firewall in a Cisco ACI environment, a contract filter must be configured to allow both ARP and HTTP. ARP is essential for IP to MAC address resolution, which is necessary for layer 2 communications within the same subnet or across subnets when routing is involved. The HTTP filter ensures that only HTTP traffic is redirected to the firewall for inspection or policy enforcement.  References : Implementing Cisco Application Centric Infrastructure Official Cert Guide

The best practices for configuring NIC teaming load balancing for Cisco UCS B-Series blades connected to Cisco ACI leaf switches involve enabling LACP (Link Aggregation Control Protocol) in active mode and enabling MAC pinning.

LACP active mode (option B) allows for the automatic bundling of several physical links into a single logical link, providing redundancy and increased bandwidth. This mode actively tests the link to ensure its functionality, which is essential for maintaining a stable connection.

MAC pinning (option E) is a method that assigns a virtual machine’s MAC address to a specific uplink. This ensures consistent forwarding paths for traffic within the same session, which is crucial for avoiding potential traffic distribution issues that could arise from dynamic changes in the network topology.

Creating vPC+ (option A) and vPC (option D) are not recommended as they are related to virtual port channels, which are not applicable in this scenario. PAgP (Port Aggregation Protocol) (option C) is Cisco’s proprietary protocol similar to LACP, but it is not the recommended practice in this context.

References  :=

Implementing Cisco Application Centric Infrastructure Official Cert Guide

Cisco’s documentation on UCS B-Series Teaming Bonding Options

 In a Cisco ACI Multi-Site setup, the ISN (Inter-Site Network) connects different ACI sites. For efficient multicast traffic routing,  BIDIR-PIM  (Bidirectional Protocol Independent Multicast) is configured throughout the ISN, which is why option B is correct. Increasing the  ISN MTU  (Maximum Transmission Unit) to support the maximum MTU sent by endpoints is crucial to prevent packet fragmentation or loss, making option C correct.

Options A, D, and E are not typically required for an ACI Multi-Site setup. Direct connectivity between Spine switches and ISN routers, as mentioned in options A and D, is usually established through leaf switches. Option E, enabling IGMPv3 on ISN routers, is more relevant for managing multicast subscriptions within a single site.

References : = Implementing Cisco Application Centric Infrastructure Official Cert Guide

 In Cisco ACI fabric, STP BPDUs are flooded in the bridge domain VLAN.  This allows the BPDUs to be propagated throughout the fabric, maintaining the STP topology 2 .

References  := Implementing Cisco Application Centric Infrastructure Official Cert Guide