Free Practice Questions for Cisco 300-630 Exam

 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

 In a stretched bridge domain solution between Cisco ACI sites with Layer 2 flood enabled, spine head-end replication is utilized to forward Broadcast, Unknown unicast, and Multicast (BUM) traffic between the sites. This method leverages the spine switches at each site to replicate BUM traffic to other sites, ensuring that all endpoints within the stretched bridge domain can receive such traffic. This approach is chosen over ISN multicast replication because it simplifies the overall design and reduces bandwidth consumption on inter-site links by avoiding unnecessary duplication of BUM traffic. References := ( Implementing Cisco Application Centric Infrastructure Official Cert Guide )

 For new nodes in a Cisco ACI Multi-Pod environment to be discoverable by existing APICs, DHCP relay needs to be enabled on the IPN devices’ links connected to the ACI spines. This allows the new nodes to obtain an IP address and be recognized by the APICs for integration into the fabric.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

 In a stretched bridge domain solution between Cisco ACI sites with Layer 2 flood disabled, headend replication is used for broadcast, unknown unicast, and multicast (BUM) traffic between sites. This approach optimizes traffic flow and reduces unnecessary flooding across the network1.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide