Exam 300-620 topic 1 question 154 discussion

Actual exam question from Cisco's 300-620

Question #: 154
Topic #: 1

A bridge domain for a new endpoint group in the Cisco ACI fabric must meet these requirements:
• The bridge domain must function as the default gateway for the subnet so that routing remains within the Cisco ACI fabric.
• ARP requests must be managed via Layer 3 unicast packets or be dropped to reduce excessive broadcast traffic.
• The impact of misconfigured virtual machines must be kept to a minimum by preventing IP addresses outside of the configured subnet from being routed.

Which set of actions must be taken?

A. Disable ARP Flooding.
Enable Limit IP Learning to Subnet.
Enable Unicast Routing on the bridge domain and configure a subnet.
B. Enable Limit IP Learning to Subnet.
Enable Unicast Routing on the bridge domain and configure a subnet.
Set Multi-Destination Flooding to Flood in BD.
C. Set Endpoint Retention Policy to default.
Enable ARP Flooding.
Enable Unicast Routing on the bridge domain and configure a subnet.
D. Enable Unicast Routing on the bridge domain and configure a subnet.
Set L2 Unknown Unicast to Flood.
Disable Endpoint Retention Policy.

Show Suggested Answer

Suggested Answer: A 🗳️

by VY01 at March 9, 2023, 3:34 a.m.

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frzzt

Highly Voted 1 year, 2 months ago

Selected Answer: A

It is A, because ARP requests must be managed via Layer 3 unicast packets or be dropped to reduce excessive broadcast traffic. Since there is no option for hardware proxy, disabling ARP is the only option to choose.

upvoted 6 times

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Maccc10

Most Recent 6 months, 1 week ago

Selected Answer: A

A seems correct

upvoted 1 times

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asd248402

11 months, 3 weeks ago

Selected Answer: A

a is the one

upvoted 1 times

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thinqtanklearningDOTcom

1 year ago

Selected Answer: A

Unicast Routing: If this setting is enabled and a subnet address is configured, the fabric provides the default gateway function and routes the traffic. Enabling unicast routing also instructs the mapping database to learn the endpoint IP-to-VTEP mapping for this bridge domain. The IP learning is not dependent upon having a subnet configured under the bridge domain. Limit IP Learning To Subnet: Prevents the local IP endpoint from being learned outside the subnets configured on the bridge domain. Prevents mis-learning of IP addresses that may not belong to the fabric. ARP Flood is off: ARP Request is handled as L3 Unicast

upvoted 1 times

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