Arista Networks Interview Questions, Process, and Tips

Q1. Check if the linked list is palindrome or not
Ans. 
To check if a linked list is a palindrome, compare the first half of the list with the reversed second half.
• Traverse the linked list to find the middle node

• Reverse the second half of the linked list

• Compare the first half with the reversed second half to check for palindrome
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Q2. C string questions
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Q1. Operating systems questions
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Q2. Linked list and system design question
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Q1. C++ Pointer, address debugging question
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Q2. Internal working of Hashmap in c C++ debugging the code
Ans. 
Hashmap in C/C++ stores key-value pairs using a hash function for fast retrieval.
• Hashmap uses a hash function to map keys to indices in an array.

• Collision handling is done using techniques like chaining or open addressing.

• Hashmap allows for fast insertion, deletion, and lookup of key-value pairs.

• Example: std::unordered_map in C++ implements a hashmap.

• Debugging hashmap code involves checking hash function, collision res
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Q1. Trie based question
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Q2. Design LRU cache
Ans. 
Design a data structure for LRU cache with get and put operations, evicting least recently used item when capacity is reached.
• Implement a doubly linked list to keep track of the order of keys based on their usage

• Use a hashmap to store key-value pairs for quick access

• Update the order of keys in the linked list when a key is accessed or inserted

• Evict the least recently used item when the cache reaches its capacity
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Q1. Unique ID generator
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Q2. Project related questions
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Q1. Operating systems, DBMS
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Q2. Few question on projects from my previous company
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Javascript concepts. Polyfill for debounce. Event loop. Questions based on your resume.

Q1. Design a ticket booking platform(Core problem: How would you prevent concurrent ticket booking by multiple users)
Ans. 
Implement session locking to prevent concurrent ticket booking by multiple users.
• Implement session locking mechanism to ensure only one user can book tickets at a time.

• Use a unique session ID for each user to track their booking process.

• Lock the session when a user starts booking tickets and release the lock once the booking is completed.

• Display a message to other users trying to book tickets if the session is already ...read more
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Q2. Questions from resume(The entire interview went on for 2 hours)
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Q1. This was the final round(on-site) and was based on Architecture + cultural fit, conducted by one of their Directors / Associate Director. Was asked questions like reasons for switch, expectation in Arista,...read more
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Q2. In a todo application a user's data is supposed to be synced in multiple devices. When there is a change made in the todo list in one device, the other device's UI needs to update without refresh. How woul...read more
Ans. 
Real-time synchronization of todo list across multiple devices using short polling and web sockets.
• Implement short polling to regularly check for updates on the server and update the UI accordingly.

• Use web sockets for real-time communication between devices to instantly push updates to all connected clients.

• Maintain a centralized database to store and retrieve the todo list data for all devices.

• Utilize a messaging queu...read more
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Q3. Pick one of your projects from your resume and explain.
Ans. 
Developed a responsive e-commerce website using React and Redux
• Utilized React for building the user interface

• Implemented Redux for managing the application state

• Designed a responsive layout for optimal viewing on different devices
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Q1. Linked list and double pointers
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