Implementing and Operating Cisco Data Center Core Technologies (DCCOR) Free Sample Questions

The APIC GUI in Advanced mode should not be mixed with other configuration methods because it provides unrestricted access to the Management Information Tree (MIT) and allows direct manipulation of managed objects. Unlike Basic mode which provides a simplified interface, Advanced mode bypasses policy validation and can lead to configuration conflicts. The other methods (NX-OS CLI, REST API, and Basic mode GUI) can be safely combined as they follow proper policy enforcement.

The port-channel load-balance dst-port module 4 command configures port channel load balancing to use the destination port as the load balancing criteria specifically for module 4. When dst-port is specified, traffic distribution across port channel members is based on the destination TCP/UDP port number in the packet headers. The other options are incorrect because source port, IP addresses, and MAC addresses are not specified in this command, and the syntax is valid for NX-OS.

An endpoint registry is best described as a collection of current endpoints known to the Cisco ACI fabric. The endpoint registry maintains a database of all discovered endpoints including their MAC addresses, IP addresses, VLAN assignments, and location information. This registry works with the policy repository to apply appropriate policies to known endpoints. The other options describe policy controllers, rule collections, or policy distribution mechanisms rather than the endpoint registry itself.

A virtual Port Channel (vPC) logically combines ports from multiple physical Nexus switches into a single logical port channel bundle, allowing downstream devices to connect to both switches simultaneously while appearing as a single port channel. This provides redundancy and increased bandwidth without Spanning Tree Protocol blocking. VIC (Virtual Interface Card), VRF instances, and VDC (Virtual Device Context) do not combine ports from multiple switches into bundles.

A contract is the primary tenant element that can be of type regular, taboo, or out-of-band (OOB). Regular contracts define allowed communication between EPGs, taboo contracts define prohibited communication, and OOB contracts govern management traffic. Bridge domains, EPGs, and filters do not have these type classifications - they serve different functions in the ACI policy model.

REST API and HTTPS are the technologies most likely in use. The GET request indicates a REST API call being made to retrieve data, and TCP port 443 confirms HTTPS (HTTP Secure) is being used for encrypted communication. XML format is a common data format returned by REST APIs when querying Cisco APIC. JSON would be an alternative format, HTTP would use port 80 (not 443), and SOAP API typically uses different request methods and XML structures.

HTTPS is confirmed by the use of TCP port 443, which is the standard secure HTTP port that provides encrypted communication between the client and the APIC device. This ensures secure transmission of the XML data being retrieved.

Link-Layer Discovery Protocol (LLDP) is used for discovering private IP addresses during the Cisco APIC cluster discovery process. LLDP enables APIC controllers to discover each other and exchange private IP address information for cluster formation. This allows the APICs to establish secure tunnels and coordinate cluster operations without relying on public IP addresses or external discovery mechanisms.

REST APIs commonly produce output in XML format, which is a structured markup language that uses tags to define data elements and provides hierarchical data representation. XML is widely supported by web services and APIs, making it a standard format for data exchange. CSV and HTML are not standard REST API output formats, and binary formats are typically not used for REST API responses.

REST APIs frequently produce output in JSON (JavaScript Object Notation) format, which is a lightweight, human-readable data interchange format. JSON has become the preferred format for many REST APIs due to its simplicity, native support in web browsers and programming languages, and smaller payload size compared to XML. Binary and CSV formats are not standard REST API output formats.

Community is a cloud computing deployment model that shares infrastructure with multiple organizations that have common needs, concerns, or compliance requirements. Unlike public clouds that serve any customer, community clouds are restricted to specific groups with shared interests such as government agencies, healthcare organizations, or financial institutions. Hybrid clouds combine multiple deployment models, and public/private clouds do not specifically address shared infrastructure among organizations with common needs.

Communication between members of the same endpoint group (EPG) is not governed by contracts in a Cisco ACI fabric. By default, members of an EPG can communicate freely with each other without requiring contracts, as they are considered to be in the same security domain. Contracts are only required for inter-EPG communication, communication between different bridge domains, and external network access. This intra-EPG communication uses the bridge domain forwarding behavior.