Checkpoint Systems Interview Questions, Process, and Tips

To find the middle of a linked list, use the slow and fast pointer technique.

• Initialize two pointers, slow and fast, at the head of the linked list.

• Move the slow pointer by one node and the fast pointer by two nodes until the fast pointer reaches the end of the list.

• The node pointed to by the slow pointer at this point is the middle of the linked list.

ANR stands for Application Not Responding, it occurs when the main UI thread is blocked for too long.

• ANR can be prevented by offloading long-running tasks to background threads or services.

• Optimizing code and reducing UI thread workload can also help prevent ANR.

• Using tools like StrictMode can help identify potential ANR issues during development.

Threading in Android allows multiple tasks to run concurrently, improving performance and responsiveness.

• Threading can be implemented using classes such as AsyncTask, Handler, and Thread.

• AsyncTask is used for short background tasks that need to update the UI, while Handler is used for communication between threads.

• Thread is a low-level way to create a new thread for longer background tasks.

• Care must be taken to avoid m...read more

ArrayList is faster for accessing elements, while LinkedList is better for frequent insertions and deletions.

• ArrayList uses an array to store elements, allowing for fast random access but slower insertions and deletions.

• LinkedList uses nodes with references to the next and previous elements, making insertions and deletions faster but access slower.

• For example, if you need to frequently add or remove elements in the mid...read more

TCP flow refers to the sequence of packets exchanged between two devices over a TCP connection.

• TCP flow involves the establishment, data transfer, and termination of a TCP connection.

• It includes the exchange of TCP segments containing data, acknowledgment, and control information.

• TCP flow control mechanisms like sliding window and congestion control help regulate the flow of data.

• TCP flow can be analyzed using tools li

DNS flow refers to the process of how a DNS query is resolved from start to finish.

• Client sends a DNS query to the recursive resolver.

• Recursive resolver checks its cache for the answer, if not found, it sends the query to authoritative nameservers.

• Authoritative nameservers respond with the IP address of the requested domain.

• Recursive resolver caches the response and sends it back to the client.

• Client now has the IP add