Loading…
Explore questions associated with Cisco. Review the source details, then use the workspace for code, notes, and diagrams.
13 questions in the library. A source association does not guarantee a future interview question.
Behavioral and leadership · Coding · System design
Loading questions…
Practice system design interviews out loud with an AI interviewer, a shared whiteboard and a scorecard for your level.
© 2026 SysRound. SysRound is an AI practice tool. The AI interviewer and the AI feedback can be wrong. Use it for your own practice, not to hire people.
Showing 1–13
Design an embedded buffer system that efficiently manages temporary data storage, handles read/write operations, and ensures reliable data flow between producers and consumers…
Companies: Cisco
Last reported Oct 2026
A shared API entry point must enforce request policies, translate protocols, and isolate failures at high request rates.
Companies: Cisco, MongoDB
authentication · configuration-distribution · fault-isolation · protocol-translation
Last reported Oct 2026
Implement a data structure that supports the following operations, all in O(1) time complexity: - get(key): Returns the value associated with the given key. -…
Companies: Cisco, Microsoft
Last reported Oct 2026
Design an API for generating and distributing unique meeting IDs across multiple servers, supporting incremental scalability requirements such as uniqueness guarantees, high…
Companies: Cisco
Last reported Aug 2026
Companies: Cisco
Last reported Aug 2026
Design a hit counter that records timestamps of hits and returns the number of hits in the past 5 minutes (300 seconds). The challenge is…
Companies: Cisco, Adyen, Apple, Databricks +5
Array · Binary Search · Data Stream · Design
Last reported Jul 2026
Choose an integer x in [0, 2^n) to maximize (a XOR x) * (b XOR x) (answer mod 1e9+7); the core challenge is picking x’s…
Companies: Cisco, Atlassian, Zomato
Bit Manipulation · Greedy · Math
Last reported Jul 2026
Implement an LFU cache with O(1) average-time get and put operations that evicts the least-frequently-used key when capacity is exceeded, breaking ties by least-recently-used…
Companies: Cisco, Amazon, Apple, Goldman Sachs +3
Design · Doubly-Linked List · Hash Table · Linked List
Last reported Apr 2026
Check a 9x9 Sudoku board is valid by verifying that no digit 1–9 (ignoring '.') appears more than once in any row, column, or 3x3…
Companies: Cisco, Amazon, Microsoft
Array · Hash Table · Matrix
Last reported Apr 2026
Given heights of vertical lines at unit-spaced x-coordinates, pick two indices i<j to maximize the area min(height[i],height[j])*(j-i). With n up to 1e5, the problem requires…
Companies: Cisco, Amazon, Bloomberg, Flipkart +4
Array · Greedy · Two Pointers
Find the maximum length of a contiguous subarray in a binary array that contains an equal number of 0s and 1s. This is solved by…
Companies: Cisco
Array · Hash Table · Prefix Sum
Implement an LRUCache that supports O(1) average-time get(key) returning the value or -1 and put(key, value) which inserts or updates a key and, if capacity…
Companies: Cisco, Adobe, Amazon, Anthropic +29
Data Structure Design · Design · Doubly-Linked List · Hash Table
Find the minimum number of steps from the top-left to bottom-right in a 4-directional binary grid if you may remove up to k obstacles; treat…
Companies: Cisco, Amazon, D. E. Shaw, Databricks +2
Array · Breadth-First Search · Matrix