Cisco® 300-620 Exam Practice Questions (P. 4)

GPT-4o - Answer

For extending EPG connectivity to an external network where the Layer 3 gateway resides, configuration D is accurate. It is crucial to implement a setup where both ARP Flooding and ARP Gleaning are disabled to enable efficient ARP resolution management across the bridge domain, reducing unnecessary traffic flooding within the ACI infrastructure. Using ARP Flooding could potentially lead to suboptimal traffic flows and overhead, which isn't ideal in scenarios involving external networks and Layer 3 gateways. Thus, option D's ability to manage ARP resolution efficiently makes it preferable for such implementations.

GPT-4o - Answer

When configuring a bridge domain with the hardware-proxy option for handling Layer 2 unknown unicast traffic in a Cisco ACI environment, the leaf switch plays a crucial role in the decision-making process for unicast packet forwarding. Specifically, if a leaf switch is unable to locate a MAC address within its local forwarding table, it doesn't indiscriminately forward the traffic to different switches. Instead, it actively drops the packet. This setup enhances the network's efficiency by reducing unnecessary traffic and potential flooding across the network. It’s critical to ensure that such configurations align well with your network design for optimal performance and security.

GPT-4o - Answer

Enabling MCP (Misconfiguration Prevention Protocol) on the ACI fabric is essential to effectively prevent Layer 2 loops when a Layer 2 Out is configured. MCP operates by mitigating the risks associated with BPDU (Bridge Protocol Data Unit) propagation, which if unchecked, can lead to loops. It’s a proactive measure to manage events effectively, keeping the network's integrity and performance intact.

GPT-4o - Answer

Absolutely, for setting up a connection that denotes an external bridged network within ACI, the deployment of a Layer 2 outside connection is vital. This config essentially broadcasts the bridge domain beyond the confines of the ACI fabric, integrating external layer 2 networks seamlessly. It's key in scenarios requiring bridge domain extensions to third-party systems or distant sites, maintaining consistent policy enforcement across varied network segments. Meanwhile, the option of employing Layer 2 remote fabric is slightly less mentioned in contexts of extending bridge domains directly. Always good to check the specifics in the latest Cisco documentation though, as network requirements can sway the optimal setup approach.

GPT-4o - Answer

Extending a Layer 2 domain beyond the ACI fabric primarily involves strategies that allow for the continuation of the same Layer 2 network across different physical locations. Extending the bridge domain (Option D) and extending the Endpoint Groups (EPGs - Option E) are precise examples where the geographical limitations of a single data center are surpassed, enabling resource accessibility and shared services across multiple sites or systems within the same L2 network. These options actively promote seamless connectivity and resource sharing by stretching the Layer 2 network beyond the confines of a single ACI setup.