MCSD MCSD Performance Optimization and Scalability

Question 1

Which .NET profiling tool built into Visual Studio helps identify CPU hotspots and memory allocations in running applications?

Accepted Answer

Visual Studio Diagnostic Tools / Performance Profiler

Answer

The Visual Studio Performance Profiler includes CPU Usage, Memory Usage, and other tools that sample or instrument running code to pinpoint performance bottlenecks.

Question 2

What is the primary advantage of using async/await in ASP.NET Core for I/O-bound operations?

Accepted Answer

It frees thread pool threads to handle other requests while waiting for I/O to complete

Answer

async/await returns the thread to the pool during I/O waits, allowing a small number of threads to serve many concurrent requests without blocking.

Question 3

In Azure, which service provides a distributed, in-memory cache that reduces database load for frequently accessed data?

Accepted Answer

Azure Cache for Redis

Answer

Azure Cache for Redis is a fully managed Redis service that stores frequently read data in memory so applications can retrieve it without hitting the database on every request.

Question 4

Which IMemoryCache method in ASP.NET Core stores a value and specifies that it should expire 10 minutes after it was last accessed?

Accepted Answer

cache.Set() with SlidingExpiration = TimeSpan.FromMinutes(10)

Answer

SlidingExpiration resets the expiration timer each time the cached entry is accessed, keeping hot items in cache while evicting unused ones after the specified idle period.

Question 5

What does the Response Caching middleware in ASP.NET Core do when a [ResponseCache] attribute is applied to a controller action?

Accepted Answer

It stores the HTTP response and serves it directly for matching subsequent requests without executing the action

Answer

Response Caching middleware intercepts requests matching cached entries and returns stored responses, bypassing controller execution and reducing server CPU and database load.

MCSD - Microsoft Certified Solutions Developer Practice Test

MCSD - Microsoft Certified Solutions Developer Practice Test

MCSD MCSD Performance Optimization and Scalability