Exam 300-620 topic 1 question 24 discussion

I think the answer is C. IMPORTANT In a single BD with Multiple EPGs, each EPG is defined by a different VLAN encapsulation. IF those VLANs extend into you legacy non-ACI network, then (by default) these frames will leak from one VLAN to another - which is probably NOT what you want, which is why there is a Multi-Destination Flooding option to Flood in Encapsulation - to prevent leakage from one EPG to another - but again, this may break some protocols. But before setting your BD to Flood in Encapsulation re-read the IF statement above.

I go with A. in application centric we can have multiple EPGs in 1 BD having different vlan tags. However on legacy it will be one Vlan/BD. https://community.cisco.com/t5/application-centric/aci-bridge-domain-setting-discussion/td-p/3182528 Encapsulation = Encap VLAN = VLAN tagged on the wire. Assuming you have 1 VLAN : 1 EPG, and you have multiple EPGs in 1 BD, then multi-destination packets (which fall into this setting's category) are only flooded within the EPG. Setting this to "Flood in BD" will flood traffic through out the BD.

During migration, the legacy environment and ACI fabric are interconnected via a Layer 2 trunk. If multi-destination traffic is not controlled, it could flood into the legacy environment, causing network instability. By limiting flooding to the ACI fabric's encapsulation, you ensure that the legacy environment is not overwhelmed with unnecessary traffic.

Flood in Encapsulation: This feature allows unknown unicast, broadcast, and multicast traffic to be flooded within the specified VLAN encapsulation. This behavior is essential during migrations to ensure that any unknown traffic from the legacy environment is properly handled without causing disruptions or instability.

I think that you need to migration everything to ACI after you create the AP Centric, because. answer is A

This functionality was introduced in the Cisco APIC 3.1 releases primarily for service graph policy-based redirect (PBR) deployments, and it has been superseded by the ability to disable IP dataplane learning per-VRF instance (Cisco APIC release 4.0). We do not recommend disabling IP learning per bridge domain and it is not supported except when used with PBR. Then it is no D

https://community.cisco.com/t5/application-centric-infrastructure/aci-bridge-domain-setting-discussion/td-p/3182528

https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2020/pdf/BRKACI-3545.pdf • Flood in BD Flood within the same BD regardless of EPG or VLAN. • Flood in Encapsulation Flood within the same access encap VLAN and BD regardless of EPG.

Recommended Solution The flood in encapsulation option is used to limit flooding traffic inside the bridge domain to a single encapsulation. When EPG1/VLAN X and EPG2/VLAN Y share the same bridge domain and flood in encapsulation is enabled, the encapsulation flooding traffic does not reach the other EPG/VLAN. https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/6x/l2-configuration/cisco-apic-layer-2-networking-configuration-guide-60x/bridging-60x.html

I'll go with B The feature lets you scope the flooding domain to the individual VLANs on which the traffic is received. This is roughly equivalent to scoping the flooding to the EPGs. https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/cisco-application-centric-infrastructure-design-guide.html#_Toc129073543

C as everybody says. Network centric mode: 1 EPG --> 1 vlan. Application centric mode : multiple vlan in 1 EPG.

A. Set Multi-Destination Flooding to Flood in BD (Bridge Domain): Enabling multi-destination flooding in the bridge domain ensures that broadcast, unknown unicast, and multicast (BUM) traffic is flooded within the bridge domain. This setting can help maintain visibility of legacy systems during the migration phase, as it ensures that BUM traffic can still flow across the newly integrated ACI infrastructure. This option can be particularly useful during migrations to ensure that devices in the legacy network can still communicate with devices that have been moved to the ACI fabric.

The correct answer is B

Multi-Destination Flooding to Flood in Encapsulation

Application Centric means many VLAN in the same BD so Multi-Destination Flooding to Flood in Encapsulation

Any new exam takers? Is this still valid? I heard that Cisco Data Center certification is getting some revisions.

The correct answer is C. Set Multi-Destination Flooding to Flood in Encapsulation. During the migration of a legacy environment to Cisco ACI, it is common to interconnect the two environments using a Layer 2 trunk. This can cause instability in the ACI fabric, especially if the legacy environment has different network policies and settings. To reduce instability during the migration, it is recommended to configure the Multi-Destination Flooding feature in the bridge domain to flood traffic in the encapsulation. This will ensure that the Layer 2 traffic from the legacy environment is handled by the ACI fabric in a more efficient manner, reducing the likelihood of instability.