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To pass the Cisco 300-620 exam, candidates must demonstrate their ability to configure and manage ACI fabric infrastructure, including tenant policies, endpoint groups, application profiles, and network profiles. They must also be able to troubleshoot ACI fabric infrastructure issues and implement security policies to protect the infrastructure. Additionally, candidates must demonstrate their understanding of ACI integration with other data center infrastructure components, such as storage and compute resources. Earning the Cisco 300-620 certification demonstrates a high level of expertise in deploying and managing Cisco ACI infrastructure, making it a valuable credential for IT professionals seeking to advance their careers in the data center industry.
To take the Cisco 300-620 Exam, candidates are required to have a solid understanding of data center networking technologies, including Ethernet and IP networking, data center storage, and virtualization. They should also have experience working with Cisco Nexus switches and be familiar with Cisco ACI architecture, policies, and automation tools. 300-620 exam consists of 60-70 questions that need to be answered in 90 minutes, with a passing score of 750 or higher out of 1000.
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Cisco 300-620 certification exam is designed for IT professionals seeking to validate their knowledge and skills in implementing Cisco Application Centric Infrastructure (ACI). ACI is a software-defined networking (SDN) solution that simplifies data center management and automates network provisioning. 300-620 Exam Tests candidates on their ability to configure, manage, and troubleshoot ACI environments, as well as their understanding of the underlying technologies and protocols.
NEW QUESTION # 75
A data center administrator is upgrading an ACI fabric. There are 3 APIC controllers in the fabric and all the servers are dual-homed to pairs of leaf switches configured in VPC mode. How should the fabric be upgraded to minimize possible traffic impact during the upgrade?
Answer: A
NEW QUESTION # 76
Refer to the exhibit.
Refer to the exhibit. An engineer configured subnets on the external EPG called L3OUT_CORE. The external endpoints in the 10.1.0.0/24 subnet can reach internal endpoints, but the external endpoints in the 172.16.1.0/24 subnet are unreachable. Which set of actions enables the connectivity?
Answer: C
NEW QUESTION # 77
A network engineer is implementing a Layer 3 Out in the Cisco ACI fabric. The data center core switches must connect to a pair of leaf switches and exchange routes via a routing protocol. In addition, the implementation must meet these criteria:
- The external switch interface must use 802.1Q tagging.
- Access to the Internet for the ACI fabric must be the L3Out.
- The L3Out must use a routing protocol that has rapid convergence time and low CPU usage.
Which configuration set meets these requirements?
Answer: C
NEW QUESTION # 78
When Layer 3 routed traffic is destined to a Cisco ACI fabric, which mechanism does ACI use to detect silent hosts?
Answer: A
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 # 79
A company must connect three Cisco ACI data centers by using Cisco ACI Multi-Site. An engineer must configure the Inter-Site Network (ISN) between the existing sites. Which two configuration steps must be taken to implement the ISN? (Choose two.)
Answer: B,E
NEW QUESTION # 80
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