Implementing Cisco Application Centric Infrastructure (DCACI) v1.0
Question 1
What must be enabled in the bridge domain to have the endpoint table learn the IP addresses of endpoints?
- A. L2 unknown unicast: flood
- B. GARP based detection
- C. unicast routing
- D. subnet scope
Answer : C
Reference:
https://hsvglobalschool.in/dhkycw/cisco-aci-bridge-domain.html
Question 2
An engineer is extending EPG connectivity to an external network. The external network houses the Layer 3 gateway and other end hosts. Which ACI bridge domain configuration should be used?
- A. Forwarding: Custom L2 Unknown Unicast: Hardware Proxy L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Enabled
- B. Forwarding: Custom L2 Unknown Unicast: Flood L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Enabled
- C. Forwarding: Custom L2 Unknown Unicast: Hardware Proxy L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Disabled
- D. Forwarding: Custom L2 Unknown Unicast: Flood L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Disabled
Answer : D
Question 3
An engineer configured a bridge domain with the hardware-proxy option for Layer 2 unknown unicast traffic. Which statement is true about this configuration?
- A. The leaf switch drops the Layer 2 unknown unicast packet if it is unable to find the MAC address in the local forwarding tables.
- B. The Layer 2 unknown hardware proxy lacks support of the topology change notification.
- C. The leaf switch forwards the Layers 2 unknown unicast packets to all other leaf switches if it is unable to find the MAC address in its local forwarding tables.
- D. The spine switch drops the Layer 2 unknown unicast packet if it is unable to find the MAC address in the proxy database.
Answer : A
Question 4
An engineer configured Layer 2 extension from the ACI fabric and changed the Layer 2 unknown unicast policy from Flood to Hardware Proxy. How does this change affect the flooding of the L2 unknown unicast traffic?
- A. It is forwarded to one of the spines to perform as a spine proxy.
- B. It is flooded within the whole fabric.
- C. It is dropped by the leaf when the destination endpoint is not present in the endpoint table.
- D. It is forwarded to one of the APICs to perform as a proxy.
Answer : A
Reference:
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/2-x/L2_config/b_Cisco_APIC_Layer_2_Configuration_Guide/ b_Cisco_APIC_Layer_2_Configuration_Guide_chapter_010.html
Question 5
When the subnet is configured on a bridge domain, on which physical devices is the gateway IP address configured?
- A. all leaf switches and all spine nodes
- B. only spine switches where the bridge domain of the tenant is present
- C. only leaf switches where the bridge domain of the tenant is present
- D. all border leaf nodes where the bridge domain of the tenant is present
Answer : C
Reference:
http://www.netdesignarena.com/index.php/2016/06/16/aci-tenant-building-blocks-forwarding-logic/
Question 6
Which method does the Cisco ACI fabric use to load-balance multidestination traffic?
- A. forwarding tag trees
- B. PIM routing
- C. spanning trees
- D. shortest-path trees
Answer : A
Reference:
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/aci-fundamentals/b_ACI-Fundamentals/b_ACI-Fundamentals_chapter_010010.html
Question 7
What happens to the traffic flow when the Cisco ACI fabric has a stale endpoint entry for the destination endpoint?
- A. The leaf switch does not learn the source endpoint through data plane learning.
- B. The leaf switch drops the traffic that is destined to the endpoint.
- C. The leaf switch floods the traffic to the endpoint throughout the fabric.
- D. The leaf switch sends the traffic to the wrong destination leaf.
Answer : B
Reference:
https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2019/pdf/BRKACI-2641.pdf
Question 8
Which action sets Layer 2 loop migration in an ACI Fabric with a Layer 2 Out configured?
- A. Enable MCP on the ACI fabric.
- B. Disable STP in the external network.
- C. Disable STP on the ACI fabric.
- D. Enable STP on the ACI fabric.
Answer : A
Question 9
An engineer is implementing a connection that represents an external bridged network. Which two configurations are used? (Choose two.)
- A. Layer 2 remote fabric
- B. Layer 2 outside
- C. Layers 2 internal
- D. Static path binding
- E. VXLAN outside
Answer : AB
Question 10
Which two actions extend a Layer 2 domain beyond the ACI fabric? (Choose two.)
- A. extending the routed domain out of the ACI fabric
- B. creating a single homed Layer 3 Out
- C. creating an external physical network
- D. extending the bridge domain out of the ACI fabric
- E. extending the EPG out of the ACI fabric
Answer : AE
Question 11
When Cisco ACI connects to an outside Layers 2 network, where does the ACI fabric flood the STP BPDU frame?
- A. within the bridge domain
- B. within the APIC
- C. within the access encap VLAN
- D. between all the spine and leaf switches
Answer : A
Reference:
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c07-
732033.html#_Toc395143571
Question 12
On which two interface types should a user configure storm control to protect against broadcast traffic? (Choose two.)
- A. APIC facing interfaces
- B. port channel on a single leaf switch
- C. all interfaces on the leaf switches in the fabric
- D. endpoint-facing trunk interface
- E. fabric uplink interfaces on the leaf switches
Answer : BD
Reference:
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/2-x/L2_config/b_Cisco_APIC_Layer_2_Configuration_Guide/ b_Cisco_APIC_Layer_2_Configuration_Guide_chapter_01010.html
Question 13
Which two dynamic routing protocols are supported when using Cisco ACI to connect to an external Layer 3 network? (Choose two.)
- A. iBGP
- B. VXLAN
- C. IS-IS
- D. RIPv2
- E. eBGP
Answer : AE
Reference:
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/ACI_Best_Practices/b_ACI_Best_Practices/ b_ACI_Best_Practices_chapter_010010.html
Question 14
What must be configured to redistribute externally learned OSPF routes within the ACI fabric?
- A. Route Control Profile
- B. BGP Route Reflector
- C. BGP Inter-leak Route Map
- D. PIM Sparse Mode
Answer : B
Reference:
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/ACI_Best_Practices/b_ACI_Best_Practices/ b_ACI_Best_Practices_chapter_010010.html
Question 15
Regarding the MTU value of MP-BGP EVPN control plane packets in Cisco ACI, which statement about communication between spine nodes in different sites is true?
- A. By default, spine nodes generate 9000-bytes packets to exchange endpoints routing information. As a result, the Inter-Site network should be able to carry 9000-bytes packets.
- B. By default, spine nodes generate 1500-bytes packets to exchange endpoints routing information. As a result, the Inter-Site network should be able to carry 1800-bytes packets.
- C. By default, spine nodes generate 1500-bytes packets to exchange endpoints routing information. As a result, the Inter-Site network should be able to carry 1500-bytes packets.
- D. By default, spine nodes generate 9000-bytes packets to exchange endpoints routing information. As a result, the Inter-Site network should be able to carry 9100-bytes packets.
Answer : D