View Full Cisco CCNP Data Center 300-635 Exam Dumps and Practice Test Dumps

 

Question 41.

Which Cisco data center platform commonly exposes a REST API for policy-driven automation of an ACI fabric?

1. Cisco APIC
   2. Cisco ASA only
   3. Cisco Unified Communications Manager
   4. Cisco Webex Control Hub

Correct Answer: 1

Explanation:

Cisco APIC is the policy controller for Cisco ACI and provides APIs that allow automation systems to query and modify fabric configuration. Through APIC, scripts can interact with tenants, application profiles, bridge domains, contracts, endpoint groups, interface policies, and many other managed objects. API-driven interaction is especially useful because it provides structured, machine-readable access rather than requiring CLI screen scraping. The API follows the ACI managed-object model, so developers need to understand classes, distinguished names, parent-child relationships, and attributes. The other listed platforms are not the primary controllers for ACI fabric automation.

Question 42.

Which API request type is most appropriate when a script needs to retrieve the current state of a resource without modifying it?

1. POST
   2. GET
   3. DELETE
   4. PATCH

Correct Answer: 2

Explanation:

GET is the standard HTTP method used to retrieve the representation or state of a resource without intentionally modifying it. In data center automation, a script might use GET to retrieve switch inventory, interface state, ACI object information, or server profile details before deciding whether changes are required. POST is generally used to create or submit data, DELETE removes resources, and PATCH is commonly associated with partial updates when supported. Reliable automation should inspect the returned status code and validate the response body before using retrieved data to drive later configuration decisions.

Question 43.

A REST API returns HTTP status code 201 after a POST request. What does this normally indicate?

1. Authentication failed
   2. The resource was not found
   3. A resource was successfully created
   4. The server encountered an internal error

Correct Answer: 3

Explanation:

HTTP status code 201 typically indicates that the server successfully created a new resource as a result of the request. It is commonly returned after a successful POST operation. A 401 response generally indicates an authentication problem, 404 indicates that a resource could not be found, and 500-level responses generally indicate server-side failures. Automation code should not simply assume that a POST succeeded because no exception occurred at the transport layer. It should check the status code, inspect the response when relevant, and confirm that the newly created object has the expected properties.

Question 44.

Which HTTP status code usually indicates an internal server error?

1. 200
   2. 204
   3. 404
   4. 500

Correct Answer: 4

Explanation:

HTTP status code 500 indicates that the server encountered an internal error while processing the request. A 200 response normally indicates success with content returned, and 204 usually means successful processing without a response body. A 404 response indicates that the requested resource could not be found. Automation scripts should handle 500-series responses carefully because retrying immediately may or may not be appropriate depending on the cause. Good error handling includes logging the request context, preserving relevant response information, and applying controlled retry logic rather than repeatedly sending potentially disruptive requests.

Question 45.

Which Python library is widely used to make HTTPS calls to Cisco REST APIs?

1. requests
   2. tkinter
   3. turtle
   4. decimal

Correct Answer: 1

Explanation:

The Python requests library is widely used for sending HTTP and HTTPS requests and provides convenient methods such as get(), post(), put(), patch(), and delete(). It also supports headers, authentication, cookies, certificates, proxies, timeouts, and JSON payloads. This makes it highly useful for interacting with Cisco APIs such as APIC, Intersight, and other REST-based interfaces. Other modules listed here serve unrelated purposes. Production automation should also configure sensible timeouts and error handling instead of relying on default behavior, because network or API failures can otherwise cause scripts to hang or terminate unexpectedly.

Question 46.

Which Python keyword is used to define a reusable function?

1. class
   2. def
   3. except
   4. import

Correct Answer: 2

Explanation:

The def keyword defines a function in Python. Functions allow automation developers to organize code into reusable units, such as functions for authentication, API requests, response validation, inventory retrieval, or configuration changes. This improves maintainability and reduces duplicated code. class defines a class, except handles exceptions in a try/except structure, and import loads modules. Functions are especially useful in infrastructure automation because many operations must be repeated across multiple devices or APIs, and centralizing logic makes future updates easier and safer.

Question 47.

Which Python structure is most appropriate for storing a collection of ordered device names that may contain duplicates?

1. Dictionary only
   2. Set only
   3. List
   4. Integer

Correct Answer: 3

Explanation:

A Python list stores an ordered sequence of items and can contain duplicate values. This makes it appropriate for collections such as device names, interface identifiers, task results, or API objects where order may matter. A set stores unique elements without the same ordering guarantees and automatically removes duplicates. A dictionary stores key-value pairs, while an integer stores a single numeric value. Choosing appropriate data structures makes automation logic clearer and reduces unnecessary processing. Lists are also easily iterable using for loops, which is common in network and data center automation.

Question 48.

Which Python structure is best suited for storing unique values when duplicate entries should automatically be removed?

1. Tuple only
   2. String
   3. Dictionary values only
   4. Set

Correct Answer: 4

Explanation:

A Python set stores unique elements, so duplicate values are automatically removed. Sets are useful when automation needs to identify unique VLAN IDs, switch names, IP addresses, or other items collected from multiple sources. Sets also support operations such as union, intersection, and difference, which can be useful when comparing current and desired infrastructure state. Lists preserve order and duplicates, while strings represent text. Selecting a set can simplify data-cleanup logic because the language itself enforces uniqueness.

Question 49.

Which Python statement can stop the current loop entirely when a specified condition is met?

1. break
   2. import
   3. pass only
   4. return only

Correct Answer: 1

Explanation:

The break statement immediately exits the current loop. This is useful when an automation workflow has found the target object it was searching for or when an error condition means continuing the loop is unnecessary. For example, a script searching through API results for a specific switch can exit once the correct record is located. pass performs no action, while import loads modules. return exits a function rather than specifically controlling loop execution. Proper loop control helps automation run efficiently and avoids unnecessary API calls.

Question 50.

Which Python statement skips the rest of the current loop iteration and proceeds to the next iteration?

1. raise
   2. continue
   3. return
   4. import

Correct Answer: 2

Explanation:

The continue statement skips the remaining statements in the current iteration of a loop and proceeds directly to the next item. This can be useful when an automation script encounters a device that does not meet certain criteria but should continue processing other devices. For example, a script may skip an offline switch while continuing through the rest of an inventory. raise generates an exception, return exits a function, and import loads a module. Understanding loop control is important for resilient automation across large infrastructure inventories.

Question 51.

What is the primary purpose of a timeout value in an API request?

1. Prevent a script from waiting indefinitely for a response
   2. Encrypt the API payload
   3. Change the HTTP method
   4. Increase the server’s CPU capacity

Correct Answer: 1

Explanation:

A timeout prevents an automation script from waiting indefinitely when a server, controller, or network path does not respond. Without timeouts, one unreachable endpoint can cause a workflow to hang and block processing of all remaining systems. Well-designed automation should use reasonable connection and response timeouts and handle timeout exceptions gracefully. Depending on the workflow, the script may retry, skip the failed device, or escalate the issue. Timeouts do not provide encryption or alter HTTP semantics. They are a reliability feature that helps automation behave predictably under failure conditions.

Question 52.

What is the primary purpose of retry logic in an infrastructure automation script?

1. Guarantee that an invalid request eventually succeeds
   2. Recover from temporary failures such as transient connectivity or service availability issues
   3. Remove the need for validation
   4. Replace authentication

Correct Answer: 2

Explanation:

Retry logic can help automation recover from temporary issues such as brief network interruptions, controller overload, or transient service errors. However, retries should be controlled rather than infinite. The script should distinguish temporary conditions from permanent errors such as invalid credentials or malformed requests. Exponential backoff can reduce load by gradually increasing the wait time between retries. Retrying an invalid request repeatedly does not make it valid, so error classification remains important. Robust automation combines retries with timeouts, exception handling, logging, and clear limits on the number of attempts.

Question 53.

Which technique gradually increases the delay between repeated API retry attempts?

1. Exponential backoff
   2. VLAN pruning
   3. Route redistribution
   4. Link aggregation

Correct Answer: 1

Explanation:

Exponential backoff increases the delay between retry attempts, often doubling or otherwise expanding the waiting period after each failure. This reduces the chance that an automation system will overload an API that is already experiencing problems. It is commonly combined with a maximum retry count and sometimes random jitter. If an API returns a rate-limit or temporary server error, controlled backoff can be much safer than immediate rapid retries. VLAN pruning, route redistribution, and link aggregation are networking concepts unrelated to API retry behavior.

Question 54.

Which HTTP response code commonly indicates that the client has sent too many requests in a given period?

1. 200
   2. 429
   3. 404
   4. 302

Correct Answer: 2

Explanation:

HTTP status code 429 indicates that the client has exceeded the server’s allowed request rate. APIs use rate limiting to protect resources and maintain service stability. When automation encounters a 429 response, it should avoid immediately retrying at full speed. The API may provide a header indicating when the client should try again. A controlled retry strategy with backoff is usually appropriate. A 200 indicates success, a 404 means the resource was not found, and 302 typically represents redirection. Respecting rate limits is important when automating large environments with many API operations.

Question 55.

In Cisco ACI, which object logically groups application endpoint groups within an application definition?

1. Application Profile
   2. Physical Domain only
   3. Leaf Interface Profile
   4. VLAN Pool only

Correct Answer: 1

Explanation:

An Application Profile in Cisco ACI logically groups application Endpoint Groups, or EPGs, within a tenant. It represents part of the application-centric policy model and helps organize endpoints and their communication requirements. EPGs within an Application Profile can consume or provide contracts to define permitted communication. Physical domains, VLAN pools, and interface profiles are important fabric constructs but do not serve the same application-grouping purpose. When using the APIC API, automation scripts may create an application profile and then create child EPG managed objects beneath it.

Question 56.

In Cisco ACI, what is the primary function of a contract?

1. Assign IP addresses using DHCP
   2. Define permitted communication between endpoint groups
   3. Replace the tenant object
   4. Store API credentials

Correct Answer: 2

Explanation:

Contracts define the communication policy between endpoint groups in Cisco ACI. One EPG can provide a contract and another can consume it, allowing specific types of traffic as defined by subjects and filters. This policy-driven approach allows administrators to control communication based on application relationships rather than only network addresses. Contracts do not assign IP addresses or store credentials. Automation through APIC APIs can create contracts, filters, and EPG relationships programmatically, making it possible to deploy application policy consistently across environments.

Question 57.

Which Cisco ACI object represents a logical group of endpoints that share common policy requirements?

1. Endpoint Group
   2. Route reflector only
   3. Spine interface
   4. API token

Correct Answer: 1

Explanation:

An Endpoint Group, or EPG, is a logical collection of endpoints that share common policy requirements within Cisco ACI. Endpoints in an EPG may be associated with similar application roles, security requirements, or connectivity needs. Communication between EPGs is typically governed by contracts. EPGs exist within application profiles and belong to tenants. Because EPGs are represented as managed objects, automation can create, query, modify, and delete them through APIC APIs. Understanding this logical model is essential when using code to deploy ACI application policies.

Question 58.

Which Cisco ACI object provides Layer 2 forwarding context and commonly connects EPGs to a subnet or Layer 3 gateway configuration?

1. Application Profile
   2. Bridge Domain
   3. Contract Subject only
   4. VMM Controller only

Correct Answer: 2

Explanation:

A Bridge Domain provides Layer 2 forwarding context in Cisco ACI and can contain subnet configuration used for Layer 3 gateway functionality. EPGs are associated with Bridge Domains, allowing endpoints to participate in the appropriate forwarding environment. Bridge Domains also include policy settings related to routing, flooding, and endpoint learning. Application Profiles organize EPGs, while contracts govern communication policy. Automation scripts working with APIC often need to create the Bridge Domain, associate it with the appropriate context, define subnets, and then link EPGs to it.

Question 59.

Which practice best reduces risk before running a new automation workflow against a production data center?

1. Test it in a controlled environment and review expected changes
   2. Run it directly against every production device first
   3. Disable logging before execution
   4. Store credentials inside the script for convenience

Correct Answer: 1

Explanation:

Testing automation in a lab, sandbox, staging environment, or limited pilot scope helps identify syntax, logic, API, and operational problems before they affect production. Engineers should also review expected changes, validate inputs, and confirm rollback procedures. Production automation can make large-scale changes quickly, so mistakes can have a wide blast radius. Disabling logging reduces observability, and hardcoding credentials introduces security risk. Controlled testing, peer review, change approval, and incremental deployment are core practices for safe data center automation.

Question 60.

A script is about to delete several infrastructure objects returned by an API query. Which safeguard is most appropriate before executing the deletions?

1. Validate the target objects against explicit selection criteria and require confirmation or policy approval where appropriate
   2. Delete all returned objects immediately
   3. Disable audit logging first
   4. Ignore the API response contents

Correct Answer: 1

Explanation:

Destructive automation should validate targets carefully before performing deletions. The script should confirm that each object matches the intended selection criteria, verify environment and scope, and, for high-impact operations, require explicit approval or confirmation. Dry-run capabilities, change previews, backups, and rollback plans can further reduce risk. Deleting every returned object blindly is dangerous because an overly broad query or malformed filter could affect unrelated infrastructure. Audit logging should remain enabled so actions can be traced. Safe automation combines technical controls with operational governance, particularly when actions are irreversible or disruptive.