Arista Networks DSA Interview Questions

What Arista Networks asks in the DSA round

Arista runs a rigorous loop: medium-hard DSA, strong C and Python fundamentals, and deep networking questions on switching, routing and protocol design.

Across the 43 questions on this page, the weight sits on these patterns:

• Linked List — 8 questions · read the reversal of linked list (in-place) guide
• Dynamic Programming — 6 questions · read the dynamic programming guide
• Backtracking — 4 questions · read the backtracking guide
• Binary Search — 4 questions · read the modified binary search guide
• Design — 4 questions · read the design data structure guide
• Sliding Window — 3 questions · read the sliding window guide
• Two Pointers — 3 questions · read the two pointers guide
• Binary Search Tree — 2 questions · read the trees guide

How to prepare for the Arista Networks interview

1. 1. Start at the top of the list above. The patterns are ordered by how often Arista Networks uses them, so the first two or three buy you the most coverage per hour.
2. 2. Solve by pattern, not at random. Doing eight linked list problems in a row is what makes the ninth recognisable in an interview — jumping between topics does not.
3. 3. Tick problems off as you go so the gaps are visible. The per-pattern counts tell you which Arista Networks topic you have actually covered.
4. 4. Write the approach before the code. Arista Networks interviews are judged on the reasoning as much as the working solution.
5. 5. Pair this with the pattern guides when a topic is new, and the system design sheet if the role is senior enough to have that round.
6. 6. If this is a campus or off-campus drive rather than a lateral move, the placement preparation guide covers the stages around the DSA round — aptitude, core subjects and the HR interview — in the order they actually happen.

Arista Networks interview questions — FAQ

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