Implementing Cisco Application Centric Infrastructure (DCACI) Free Practice Test — 30 Questions

Question 1

A network architect is responsible for securing a critical financial application, \"QuantumLedger,\" deployed within an ACI fabric. The application\'s EPG, named \"QuantumLedger-EPG,\" needs to communicate exclusively with a designated external banking API. This external API is represented by an External EPG, \"BankAPI-External-EPG.\" The security mandate dictates that communication must be restricted to TCP protocol on port 9443, and all other traffic attempts must be denied by default. The architect has already established the necessary EPGs and the relevant VRF. What is the most precise method to enforce this granular communication policy between the \"QuantumLedger-EPG\" and the \"BankAPI-External-EPG\" within the ACI framework?

Accepted Answer

Create a contract that includes a subject with a filter permitting TCP traffic on port 9443, and then associate both the "QuantumLedger-EPG" and the "BankAPI-External-EPG" with this contract.

Question 2

Anya, a seasoned network engineer, is spearheading the deployment of a new Cisco ACI fabric for a critical financial services application. The application demands granular network segmentation, enforced by strict security policies aligned with PCI DSS standards. Anya\'s team, accustomed to traditional three-tier network architectures and manual configuration, expresses apprehension regarding the shift to ACI\'s policy-driven model, citing concerns about the learning curve and potential operational disruptions. Anya needs to facilitate a smooth transition, ensuring the team embraces the new paradigm while maintaining operational stability and compliance. Which of the following approaches best exemplifies Anya\'s required competencies in leadership, adaptability, and technical communication to achieve this goal?

Accepted Answer

Proactively develop a comprehensive ACI training plan tailored to the team's existing skillsets, emphasizing hands-on labs that simulate real-world migration scenarios and clearly articulate how ACI's constructs directly support the application's compliance requirements, while establishing clear communication channels for ongoing support and feedback.

Question 3

When migrating a sensitive financial application to an ACI fabric, Elara, a senior network architect, encounters intermittent packet loss and elevated latency between specific application tiers during user acceptance testing. The application is subject to strict PCI DSS compliance, mandating robust network segmentation and auditability. Initial checks of the ACI policy configuration reveal no obvious errors in EPG definitions, bridge domains, or contracts. The issue appears intermittently and is not directly correlated with specific application traffic patterns, suggesting a potential distributed or emergent problem within the fabric\'s forwarding plane or its interaction with security policies. Which of the following diagnostic and resolution strategies would best align with Elara\'s need for rapid, accurate troubleshooting while maintaining regulatory compliance and minimizing service disruption?

Accepted Answer

Systematically analyze ACI fabric logs, endpoint group health scores, and distributed packet drop counters on leaf switches, correlating findings with APIC event logs to pinpoint policy enforcement anomalies or forwarding plane issues before considering any configuration adjustments.

Question 4

When implementing Cisco ACI, a network administrator observes that an endpoint group (EPG_Alpha) configured within Bridge Domain_Red, associated with VRF_Global, can successfully communicate with an endpoint group (EPG_Beta) residing in Bridge Domain_Blue, also associated with VRF_Global. This communication is permitted by a contract, `Contract_InterBD_Comm`, which explicitly allows traffic from EPG_Alpha to EPG_Beta. The underlying network design within the ACI fabric ensures that IP addresses within EPG_Beta\'s subnet are reachable from EPG_Alpha\'s subnet. Considering the distributed policy enforcement model of ACI, what is the most accurate assessment of this observed behavior?

Accepted Answer

The ACI fabric correctly enforces the permit policy defined in `Contract_InterBD_Comm`, allowing traffic between EPG_Alpha and EPG_Beta as intended, facilitated by the VRF and BD configurations.

Question 5

Anya, a network administrator for a large e-commerce platform, is overseeing the deployment of a new suite of microservices designed to handle customer order processing. This application architecture is highly dynamic, with services scaling up and down based on demand, and inter-service communication patterns that shift frequently. Anya\'s team is struggling to keep pace with the manual policy updates required to allow legitimate traffic flows between these ephemeral services, leading to deployment delays and occasional service disruptions due to overly restrictive or permissive rules. They need a mechanism within the Cisco Application Centric Infrastructure (ACI) fabric that can define and enforce these communication policies at a granular level, adapting to the application\'s behavior without constant manual intervention. Which ACI construct is most fundamental to establishing these specific communication rules between different application components (represented as Endpoint Groups)?

Accepted Answer

Contract

Question 6

Following a recent network-wide firmware upgrade on a Cisco ACI fabric, an administrator observes that users within the \'Finance\' tenant are reporting intermittent connectivity loss for their critical accounting application. This application relies on TCP port 443 for secure communication between two distinct application tiers, also within the \'Finance\' tenant. Crucially, all other tenants and applications operating on the same ACI fabric continue to function without any reported issues. What is the most effective initial troubleshooting approach to diagnose and resolve this specific connectivity problem?

Accepted Answer

Scrutinize the contract and associated filters defined within the 'Finance' tenant's policy that govern communication between the affected application tiers' EPGs.

Question 7

A network administrator is managing a Cisco ACI fabric. Tenant \'CorpData\' has two EPGs, \'WebServers\' and \'DBServers\', with a contract named \'AccessDB\' allowing specific HTTP traffic between them. The tenant\'s security posture has been set to \"locked\" to comply with a new internal audit directive mandating immutable security policies for critical tenants. Subsequently, a new business requirement arises to allow a third EPG, \'MonitoringTools\', to receive SNMP data from \'DBServers\'. What is the most likely outcome of attempting to implement this new communication path within the \'CorpData\' tenant?

Accepted Answer

The attempt to establish communication between 'MonitoringTools' and 'DBServers' will fail due to the tenant's "locked" security posture preventing policy modifications.

Question 8

Anya, a senior network architect, is migrating a highly regulated financial trading platform to an ACI fabric. The platform\'s security mandate dictates stringent network segmentation, limiting communication strictly to essential protocols and ports between specific application tiers. The development team expresses concerns that overly restrictive policies might hinder performance and complicate future updates. Anya must select the most appropriate contract definition within ACI to satisfy both regulatory mandates and application team requirements. Considering the sensitivity of the financial data and the need for precise control, which contract configuration best aligns with these objectives?

Accepted Answer

A contract permitting only TCP port 443 and the necessary UDP ports, bound to specific application EPGs.

Question 9

A newly deployed multi-tier application within an Application Centric Infrastructure (ACI) fabric is exhibiting sporadic packet loss and intermittent connectivity between its web and application server tiers. The network operations team has confirmed that the underlying physical infrastructure is stable and that the endpoints themselves are operational and responsive to basic ping tests within their respective subnets. Given the policy-driven nature of ACI, what is the most effective initial action to diagnose the root cause of this communication breakdown?

Accepted Answer

Review the contract applied to the EPGs associated with the web and application server tiers to ensure it permits the necessary traffic.

Question 10

A network administrator is designing an ACI fabric for a multi-tier application spanning different subnets. Tenant \'AppX\' contains two Endpoint Groups (EPGs): \'WebTier\' and \'AppTier\'. \'WebTier\' is associated with Bridge Domain \'BD-Web\' (subnet 192.168.1.0/24), and \'AppTier\' is associated with Bridge Domain \'BD-App\' (subnet 192.168.2.0/24). Both bridge domains are configured within the same Virtual Routing and Forwarding (VRF) instance. A contract named \'Web-to-App-Access\' is created, permitting TCP traffic on port 8080, and this contract is deployed between \'WebTier\' and \'AppTier\'. Considering the objective is to allow web servers in \'WebTier\' to communicate with application servers in \'AppTier\' on the specified port, what fundamental ACI construct, in conjunction with the contract, is essential for establishing the necessary Layer 3 reachability between the subnets associated with these distinct bridge domains?

Accepted Answer

The Virtual Routing and Forwarding (VRF) instance that encompasses both bridge domains, providing the Layer 3 routing context.

Question 11

Anya, a senior network architect overseeing a complex, multi-site Cisco Application Centric Infrastructure (ACI) fabric, encounters a critical situation. An application deployed across several data center locations is experiencing an unprecedented surge in east-west traffic, impacting performance. Initial analysis indicates that the existing contract between two critical application endpoint groups (EPGs) is too restrictive. Anya needs to immediately increase the allowed bandwidth and connection rate for this communication without causing downtime or introducing configuration drift across the geographically dispersed leaf switches. Which action would be the most effective and aligned with ACI\'s operational model to address this urgent requirement?

Accepted Answer

Modify the existing contract within the APIC GUI to permit the necessary traffic flows and observe the fabric's policy propagation.

Question 12

Anya, a senior network engineer, is tasked with migrating a business-critical financial trading application to a new Cisco ACI fabric. The legacy environment utilizes a complex, stateful firewall with intricate access control lists (ACLs) and Quality of Service (QoS) markings to ensure application performance and security. Anya must replicate these functionalities within the ACI fabric using its contract-based policy model and QoS classes. She has identified that the existing firewall rules specify allowed communication on TCP port 7000 between application servers and specific database servers, with a requirement for \'Expedited Forwarding\' QoS marking for this traffic. What is the most effective approach for Anya to translate this requirement into the ACI fabric to ensure both security and performance continuity?

Accepted Answer

Create an ACI contract that permits TCP traffic on port 7000 between the application server EPG and the database server EPG, and associate a 'Gold' QoS class with this contract to enforce expedited forwarding.

Question 13

Consider a scenario within a large enterprise network leveraging Cisco ACI where a specific security policy, termed \"PCI_DSS_Access_Control,\" is designed to govern communication between Application EPGs handling payment card data. This contract is intentionally scoped to a particular partition named \"PCI_Compliance_Zone.\" What is the direct operational implication of this partition scope for the \"PCI_DSS_Access_Control\" contract within the ACI fabric?

Accepted Answer

The "PCI_DSS_Access_Control" contract will only be applicable to and enforced for endpoints and EPGs that are explicitly placed within the "PCI_Compliance_Zone" partition.

Question 14

A network administrator is troubleshooting a multi-tier web application deployed within a Cisco ACI fabric. Users are reporting intermittent but significant latency when accessing the application, particularly during peak load. The application comprises distinct tiers, each mapped to separate Endpoint Groups (EPGs). Basic connectivity between tiers is confirmed, and server-level resource utilization (CPU, memory) appears within normal parameters. The administrator suspects that the ACI policy model might be contributing to the performance issue, potentially through misconfigured inter-EPG communication policies. What is the most direct and effective method for the administrator to investigate how ACI\'s policy enforcement is impacting the application\'s latency?

Accepted Answer

Analyze the specific filters defined within the contracts governing communication between the EPGs hosting the affected application tiers.

Question 15

Anya, a seasoned network engineer, is leading a critical initiative to deploy a Cisco Application Centric Infrastructure (ACI) fabric across a multi-site enterprise. Midway through the project, key stakeholder requirements have shifted significantly, necessitating a re-evaluation of the initial design and implementation plan. Simultaneously, several junior engineers on her team are struggling to grasp the new operational model and distributed policy enforcement mechanisms inherent to ACI, leading to initial integration challenges and some team friction. Anya must also contend with an accelerated timeline due to an upcoming critical business event. Which of the following behavioral competencies is MOST pivotal for Anya to effectively steer the project to a successful conclusion under these multifaceted pressures?

Accepted Answer

Adaptability and Flexibility

Question 16

A network administrator responsible for an Application Centric Infrastructure (ACI) fabric is tasked with establishing a highly isolated and secure environment for a new financial services application. This application handles sensitive customer data and must comply with stringent industry regulations that mandate strict data segregation and granular access controls. The existing ACI fabric hosts a general corporate tenant with various applications. To meet the new security and compliance requirements, which of the following actions represents the most effective and compliant approach for isolating the financial services application\'s traffic and policies within the shared physical infrastructure?

Accepted Answer

Establish a new tenant specifically for the financial services application, creating application profiles, EPGs, and bridge domains within this new tenant to define its security and network policies independently.

Question 17

Following the successful deployment of a new microservices-based application, a network administrator updates an existing Application Network Profile (ANP) within Cisco ACI. This update involves associating a newly created Endpoint Group (EPG) with a specific Virtual Routing and Forwarding (VRF) instance and then applying a previously defined contract to govern inter-EPG communication. Considering the distributed nature of the ACI fabric and its policy-driven model, what is the most critical underlying operational process that guarantees the consistent and accurate application of these configuration changes across all relevant fabric nodes, ensuring seamless application functionality and adherence to security policies?

Accepted Answer

Fabric state synchronization and policy reconciliation mechanisms ensuring eventual consistency of applied configurations across all network elements.

Question 18

Anya, a senior network architect, is spearheading the deployment of a new Cisco Application Centric Infrastructure (ACI) fabric within a large enterprise. The organization\'s strategic directive is to enhance application agility and automate network provisioning. However, Anya\'s implementation team is experiencing significant internal resistance to adopting the new ACI paradigm, coupled with a general lack of clarity regarding the project\'s long-term benefits and integration with existing business processes. Furthermore, external market shifts are necessitating a potential revision of the initial deployment roadmap. Anya must effectively lead her team through this transition, ensuring project momentum and alignment with evolving business requirements. Which of the following strategies would best equip Anya to navigate these multifaceted challenges and ensure the successful adoption of the ACI solution?

Accepted Answer

Proactively develop a comprehensive communication plan to articulate the strategic vision and benefits of ACI to all stakeholders, while simultaneously implementing targeted training sessions to upskill the team on ACI principles and foster a collaborative problem-solving environment, and preparing contingency plans to address potential roadmap deviations.

Question 19

When integrating a legacy financial trading application that requires static IP addresses for its application servers and direct L2 adjacency with its backend database, into a new Cisco ACI fabric, what is the most critical initial step to ensure functional network connectivity and adherence to ACI\'s policy-driven model?

Accepted Answer

Define distinct Endpoint Groups (EPGs) for the application servers and the database, and establish contracts specifying the allowed communication protocols and ports between these EPGs.

Question 20

Anya, a senior network architect, is migrating a legacy monolithic application to a new microservices-based architecture deployed on containers within a Cisco ACI fabric. The current ACI policy framework relies heavily on static endpoint group (EPG) definitions tied to specific IP subnets and VLANs. The new microservices application exhibits dynamic IP address allocation and frequent service scaling, making the existing static EPG approach inefficient and difficult to manage. Anya needs to propose a revised segmentation strategy that accommodates the application\'s ephemeral nature while ensuring robust security and compliance with industry best practices for cloud-native environments. Which strategic pivot best addresses this challenge within the ACI framework?

Accepted Answer

Implement a dynamic EPG strategy leveraging application-centric identification methods such as container labels and service discovery integrations, enabling automatic EPG membership based on application metadata.

Question 21

Elara, a senior network architect implementing Cisco ACI for a critical financial services platform, faces intermittent connectivity issues impacting a legacy security appliance integral to the application\'s compliance requirements. The appliance performs stateful packet inspection for proprietary financial transaction protocols. Initial troubleshooting reveals that the ACI contracts, while correctly defining allowed ports and protocols, seem to be interfering with the appliance\'s ability to maintain persistent sessions, leading to transaction failures. Which strategic adjustment to the ACI policy model would most effectively address this challenge while adhering to security and compliance mandates?

Accepted Answer

Refine the ACI contract to explicitly permit established and related traffic flows, allowing the legacy appliance to manage session state without ACI interference for specific protocol sub-flows.

Question 22

An ACI fabric administrator is tasked with deploying a stringent micro-segmentation policy for a newly migrated financial transaction processing application within an existing multi-tenant environment. The objective is to ensure that only authorized communication pathways are permitted between specific application tiers, adhering to the principle of least privilege, and to prevent any accidental exposure of sensitive data to other applications or tenants. The administrator must devise a strategy that minimizes the risk of operational disruption to existing, unrelated services running on the fabric. Which of the following approaches best aligns with ACI\'s policy model for achieving this granular security objective while maintaining operational stability?

Accepted Answer

Define new, specific Endpoint Groups (EPGs) for each tier of the financial application and create custom contracts with precisely defined filters for inter-EPG communication, ensuring these contracts are applied only to the relevant VRFs and tenants.

Question 23

Consider a scenario where a financial services organization utilizes Cisco ACI for its data center fabric. Tenant \'Alpha\' hosts customer-facing web applications, while Tenant \'Beta\' houses internal risk management systems. Due to regulatory compliance requirements, the risk management systems in Tenant \'Beta\' must periodically receive aggregated, anonymized transaction data from the customer-facing applications in Tenant \'Alpha\'. What is the fundamental ACI mechanism that must be configured to enable controlled, policy-driven communication between these two distinct Tenants?

Accepted Answer

The establishment of shared contracts and EPGs that are explicitly permitted to interact across Tenant boundaries.

Question 24

A network architect is tasked with integrating a critical legacy application, currently operating on an unmanaged Layer 3 routing protocol within its existing network segment, into a newly deployed Cisco Application Centric Infrastructure (ACI) fabric. The objective is to ensure seamless bidirectional communication between the legacy application servers and services hosted within the ACI fabric, while maintaining strict policy control and operational visibility. The architect must select the most appropriate integration strategy that adheres to ACI\'s intent-based networking principles and avoids the need for extensive re-architecture of the legacy environment.

Accepted Answer

Configure an External Layer 3 Outside network with BGP peering on border leaf switches, associate an External EPG with a VRF, and define contracts for inter-EPG communication.

Question 25

Anya, a senior network architect, is spearheading the deployment of a new Cisco ACI fabric. During the integration phase, a critical legacy firewall, essential for security policy enforcement, exhibits intermittent connectivity issues with the APIC controllers, causing unexpected policy misapplications. The vendor documentation offers limited insight into ACI-specific integration nuances, and the internal ACI subject matter expert is currently unavailable due to an urgent critical incident elsewhere. Anya must proceed with the fabric rollout while addressing this unforeseen challenge. Which combination of behavioral competencies is most prominently demonstrated by Anya\'s approach to resolving this situation?

Accepted Answer

Problem-Solving Abilities and Adaptability and Flexibility

Question 26

Anya, a senior network architect, is leading a critical migration of a high-frequency trading platform to a new ACI-based data center. The platform demands near-zero downtime and has intricate inter-service communication patterns. Anya\'s team is divided on whether to prioritize a full L3Out implementation for all external connectivity from the outset or to adopt a phased approach using L2Out for initial connectivity, gradually transitioning to L3Out as application stability is confirmed. This disagreement is causing delays and increasing project risk. Which behavioral competency is Anya most critically leveraging to navigate this situation effectively and ensure a successful migration?

Accepted Answer

Adaptability and Flexibility

Question 27

Anya, a network engineer implementing Cisco ACI, is migrating a mission-critical financial analytics platform. The platform comprises distinct tiers (web, application, database) that must communicate securely and with precise policy enforcement. Post-migration, Anya observes intermittent connectivity failures between the web and application tiers, particularly during periods of high load. Initial troubleshooting confirms that the ACI fabric is correctly configured with EPGs and a contract defining allowed traffic between these tiers, specifying ports like 8080 for application access and 5432 for database queries. However, the application\'s internal health-check mechanisms and service discovery processes occasionally utilize dynamic, ephemeral ports for inter-tier communication, which are not explicitly included in the contract. This behavior is causing traffic drops and impacting application stability. Which ACI policy adjustment would most effectively resolve this issue while maintaining a robust security posture?

Accepted Answer

Modify the contract to specify "unspecified" protocol and "unspecified" port for the communication subject between the web and application EPGs.

Question 28

Anya, a senior network engineer, is overseeing the initial deployment of a new Cisco ACI fabric. She has successfully configured the initial setup, including the APIC cluster and the physical connectivity of the leaf and spine switches. After defining several bridge domains, VRFs, and tenant policies, she commits the changes. However, she observes a noticeable lag between the APIC reporting policy commitment and the actual enforcement of these policies on the fabric, impacting application connectivity. Which of the following factors is the most probable cause for this observed delay in policy enforcement?

Accepted Answer

The health and synchronization status of the APIC cluster, impacting the timely dissemination of policy updates to fabric nodes.

Question 29

Anya, a senior network architect, is orchestrating the deployment of a new containerized application leveraging a microservices paradigm within a Cisco ACI fabric. The application spans multiple tiers, each mapped to distinct Endpoint Groups (EPGs) within the same Virtual Routing and Forwarding (VRF) instance. Despite ensuring that all EPGs are correctly associated with their respective Application Network Profiles (ANPs) and that the network virtualization overlay is functioning as expected, Anya observes that microservices communication between certain tiers is failing. She has verified that the underlying physical infrastructure is sound and that IP address assignments are correct. What fundamental ACI policy construct must Anya ensure is correctly defined and associated to permit the intended inter-EPG communication?

Accepted Answer

Cisco ACI Contracts

Question 30

A network architect is designing an ACI fabric to host multi-tenant environments. Within Tenant \'Alpha\', two distinct Application Network Profiles (ANPs), \'Web-Services\' and \'Database-Tier\', are defined. Each ANP contains a single Endpoint Group (EPG): EPG-Web residing in Bridge Domain \'BD-Web\' and EPG-DB residing in Bridge Domain \'BD-DB\'. Both BD-Web and BD-DB are associated with the same VRF, \'VRF-Alpha\', within Tenant \'Alpha\'. A contract named \'WebAccess\' is created and permits TCP traffic on port 8080. This contract is then applied to both EPG-Web and EPG-DB. Considering this configuration, what is the fundamental outcome regarding the communication between endpoints registered in EPG-Web and EPG-DB?

Accepted Answer

Communication is permitted between EPG-Web and EPG-DB for TCP traffic on port 8080, as governed by the 'WebAccess' contract.

Implementing Cisco Application Centric Infrastructure (DCACI) Free Practice Test — 30 Questions

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