DevNet Associate (DEVASC) v1.0

Git branching is a core feature that allows developers to diverge from the main line of development and continue to work in isolation without affecting the main codebase. Each branch represents an independent line of development.

• Creates separate lines of development
• Enables parallel work on features/fixes
• Lightweight and inexpensive to create

The process of routing network traffic between different VLANs using a Layer 3 switch, leveraging specialized hardware for high-speed forwarding.

• Uses Switch Virtual Interfaces (SVIs) as default gateways for VLANs.
• Performs routing in hardware (ASICs) for speed.
• More scalable and efficient than 'router-on-a-stick' for campus networks.

The Ansible `nxos_config` module is used to manage the configuration of Cisco NX-OS devices. It ensures idempotent configuration changes by comparing desired state with current state and applying only necessary modifications, often leveraging NX-API REST or NETCONF.

• Idempotent configuration management.
• Supports various configuration sections (VLANs, interfaces, etc.).
• Leverages native NX-OS APIs for structured interaction.

The TCP/IP Transport layer provides end-to-end communication between applications on different hosts, using protocols like TCP and UDP.

• Responsible for segmentation and reassembly of data.
• Uses port numbers to identify specific applications.
• TCP offers reliable, connection-oriented service; UDP offers unreliable, connectionless service.

Cisco DNA Center Network Device APIs allow programmatic access to retrieve, manage, and update information about network devices discovered and managed by DNA Center, including inventory details.

• Part of the broader Cisco DNA Center API suite.
• Used to query device details like serial number, software version, and platform.
• Enables integration with external inventory, CMDB, and asset management systems.

Cisco IOS XE Model-Driven Telemetry (MDT) is a mechanism for streaming operational data from network devices using a subscription-based, push model. It leverages YANG data models and efficient encoding (e.g., GPB, JSON) for high-frequency, structured data collection.

• Uses YANG models to define data structures.
• Push-based model (publisher-subscriber).
• More efficient and granular than SNMP polling.

Cisco SD-WAN vManage is the centralized network management system (NMS) that provides a single graphical interface for configuring, monitoring, and maintaining the entire Cisco SD-WAN fabric, including policy orchestration and troubleshooting.

• Acts as the single pane of glass for SD-WAN operations.
• Used to define and apply security, routing, and application policies.
• Provides real-time and historical monitoring data.

NX-API REST is a native RESTful API on Cisco Nexus switches running NX-OS, enabling programmatic interaction for configuration and operational data retrieval using HTTP/HTTPS and supporting data formats like XML and JSON.

• Native to NX-OS.
• Uses REST principles over HTTP/HTTPS.
• Supports XML and JSON for data exchange.

A Cisco DevNet Sandbox is a free, pre-provisioned, and isolated environment that provides access to Cisco technologies (hardware and software) for developers to learn, explore, and test code and automation scripts.

• Available 24/7 or on-demand.
• Includes various Cisco platforms (e.g., DNA Center, SD-WAN, Meraki).
• Ideal for prototyping and proof-of-concept development.

The Cisco Identity Services Engine (ISE) External RESTful Services (ERS) API provides a programmatic interface for CRUD operations on ISE configuration objects, such as users, endpoints, identity groups, and network devices.

• Used for configuration management on ISE.
• Supports standard RESTful HTTP methods (GET, POST, PUT, DELETE).
• Requires specific ERS administrative privileges.

DNS is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network.

• Translates human-readable domain names into machine-readable IP addresses.
• Primarily uses UDP port 53 for queries, TCP port 53 for zone transfers.
• Essential for web browsing and many other internet services.

The Cisco ACI REST API is the primary northbound interface to the Application Policy Infrastructure Controller (APIC) for programmatic interaction with the ACI fabric. It allows for declarative configuration of network policies and components.

• Uses HTTP/HTTPS for communication.
• Data exchanged in XML or JSON format.
• Provides full control over ACI fabric configuration and monitoring.

An Incoming Webhook in Cisco Webex Teams is a mechanism for external applications to post messages to a specific Webex Teams space using a simple HTTP POST request to a unique URL, without needing to create a full bot.

• Provides a unique URL for each webhook.
• Supports JSON payload for message content.
• Ideal for automated, one-way notifications.

Git rebase is a command that integrates changes from one branch onto another by moving or combining a sequence of commits to a new base commit, resulting in a linear project history.

• Rewrites commit history
• Creates a linear history (avoids merge commits)
• Moves a branch's commits to a new base

Cisco FSO Query APIs enable programmatic access for external applications to retrieve collected observability data, such as application performance, security events, and infrastructure metrics, based on specific query parameters.

• Used for extracting data from FSO.
• Supports various query parameters for filtering and selection.
• Essential for integration with external analysis or orchestration tools.

Fundamental security principles including Confidentiality, Integrity, and Availability, often extended with Authentication, Authorization, and Non-repudiation.

• Authentication: Verifies identity.
• Authorization: Grants permissions to access resources or functions.
• Integrity: Ensures data is accurate and has not been altered.

A connectionless Transport Layer protocol that provides minimal overhead and best-effort delivery without guaranteed reliability or ordering.

• No connection establishment (three-way handshake).
• Faster, lower latency, and less overhead than TCP.
• Suitable for real-time applications where some data loss is acceptable (e.g., streaming, gaming, DNS).

The IOS XE RESTCONF API is an HTTP-based protocol that uses YANG data models to provide programmatic access to configure and retrieve operational data from Cisco IOS XE devices in a structured format (JSON or XML).

• Based on HTTP/HTTPS.
• Uses YANG models for data definition.
• Provides CRUD (Create, Read, Update, Delete) operations.

Webex Teams Outgoing Webhooks are configured within a Webex Teams space to send notifications (HTTP POST requests) to a specified external URL whenever a new message is posted in that space. They are crucial for chatbots to receive user input.

• Pushes messages from a space to an external endpoint.
• Includes message content, sender, and space details in the payload.
• Requires a verification token for security.

A Cisco proprietary advanced distance-vector routing protocol known for its fast convergence, low overhead, and scalability.

• Uses DUAL (Diffusing Update Algorithm) for fast convergence.
• Supports unequal-cost load balancing.
• Sends partial, bounded updates, reducing bandwidth usage.

The Cisco DNA Center Network Device API provides programmatic access to discover, manage, and retrieve detailed information about network devices managed by DNA Center.

• Used for inventory management and device lifecycle.
• Endpoints for device details, interfaces, modules, and software images.
• Supports filtering and pagination for large datasets.

The IP address of the router interface on a local network that acts as a forwarding host to other networks.

• Enables communication with devices outside the local subnet.
• Must be on the same subnet as the host.
• Often the router's IP address for that network segment.

Encapsulation is one of the fundamental principles of Object-Oriented Programming (OOP). It refers to the bundling of data (attributes) and methods (functions) that operate on the data into a single unit (a class), and restricting direct access to some of the object's components, typically achieved through access modifiers or by simply not exposing internal details.

• Bundles data and methods into a single unit (class)
• Restricts direct access to internal state
• Hides implementation details from the outside world

Cisco DNA Center is an intent-based networking controller that provides centralized management, automation, and assurance for enterprise networks.

• Automates network provisioning and policy application.
• Offers a single pane of glass for network management.
• Supports both wired and wireless enterprise networks.