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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: ACI Fabric Infrastructure | 20% | - Describe ACI Object Model - Utilize faults, event record, and audit log - Implement ACI logical constructs
- Implement ACI policies
|
| Topic 2: ACI Management | 20% | - Configure software upgrade - Implement out-of-band and in-band management - Implement AAA and RBAC - Utilize syslog and SNMP services - Implement configuration backup
|
| Topic 3: ACI Anywhere | 10% | - Describe multipod architecture - Describe multisite architecture |
| Topic 4: External Network Connectivity | 20% | - Implement Layer 2 out
|
| Topic 5: Integrations | 15% | - Implement VMware vCenter DVS integration - Describe resolution immediacy in VMM - Implement service graph
|
| Topic 6: ACI Packet Forwarding | 15% | - Implement bridge domain configuration
|
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NEW QUESTION # 201
When Layer 3 routed traffic is destined to a Cisco ACI fabric, which mechanism does ACI use to detect silent hosts?
Answer: B
Explanation:
The question asks about the mechanism Cisco ACI uses to detect silent hosts when Layer 3 routed traffic is destined to the ACI fabric. A "silent host" refers to an endpoint that does not initiate traffic or send ARP requests, making detection challenging without specific mechanisms. Let's evaluate the options based on Cisco ACI documentation and best practices.
Requirement Analysis
Layer 3 routed traffic implies that the ACI fabric is handling IP routing, and the detection mechanism must work within the context of the bridge domain and endpoint learning.
Silent hosts require passive detection methods since they do not generate active traffic (e.g., ARP requests).
The solution must align with ACI's endpoint learning and proxy mechanisms.
Option Evaluation
A . Gratuitous ARP:
Gratuitous ARP (GARP) is a mechanism where a host announces its IP-to-MAC mapping to update network devices. However, this requires the host to send the GARP, which a silent host does not do. ACI can use GARP when hosts are active, but it is not the primary method for silent hosts.
Reference:
B . Inverse ARP:
Inverse ARP is used in Frame Relay or ATM networks to map DLCI/VPI-VCI to IP addresses. It is not applicable to ACI's IP-based Layer 3 routing or silent host detection.
C . ARP Gleaning:
ARP gleaning is a passive mechanism in ACI where the fabric learns the IP-to-MAC binding of a silent host by inspecting ARP traffic destined to or from other devices (e.g., routers or proxies) within the same bridge domain. When Layer 3 routed traffic passes through the ACI fabric, the leaf switches can glean the silent host's information from ARP responses or related traffic, even if the host itself is silent.
D . Proxy ARP:
Proxy ARP is used by ACI to respond to ARP requests on behalf of silent hosts when the hardware proxy feature is enabled. While this helps with connectivity, it is a response mechanism, not a detection method. Detection still relies on gleaning or other passive learning.
Final Answer Justification
C is correct because ARP gleaning is the specific mechanism ACI uses to detect silent hosts when Layer 3 routed traffic is involved. The fabric passively learns the host's IP and MAC addresses from ARP traffic generated by other devices (e.g., routers or active hosts) within the bridge domain, which is particularly effective in routed environments.
Primary Cisco Reference:
Cisco APIC Layer 3 Networking Configuration Guide, "Endpoint Learning with ARP Gleaning." Cisco ACI Best Practices, "Silent Host Detection in Routed Networks."
NEW QUESTION # 202
Refer to the exhibit.
Which action should be taken to ensure authentication if the RADIUS servers are unavailable?
Answer: A
NEW QUESTION # 203
In-band is currently configured and used to manage the Cisco ACI fabric. The requirement is for leaf and spine switches to use out-of-band management for NTP protocol. Which action accomplishes this goal?
Answer: A
Explanation:
To configure leaf and spine switches in a Cisco ACI fabric to use out-of-band management for NTP protocol, an Override Policy with NTP Out-of-Band must be created. This policy specifies that NTP traffic should be directed through the out-of-band management network, separate from the in-band management traffic, ensuring dedicated management connectivity for time synchronization.
https://www.cisco.com/c/en/us/support/docs/cloud-systems-management/application-policy-infrastructure-controller-apic/200128-Configuring-NTP-in-ACI-Fabric-Solution.html
NEW QUESTION # 204
Which two IP address types are available for transport over the ISN when they are configured from Cisco ACI Multi-Site Orchestrator? (Choose two.)
Answer: A,D
Explanation:
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric- infrastructure/white-paper-c11-739609.html
NEW QUESTION # 205
Refer to the exhibit. An application called App_1 is hosted on the server called S1. A silent host application, App_2, is hosted on S2. Both applications use the same VLAN encapsulation.
Which action forces Cisco ACI fabric to learn App_2 on ACI leaf 2?
Answer: D
NEW QUESTION # 206
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