Cisco vs ServiceNow Interview Questions
Cisco lists 87 LeetCode interview questions while ServiceNow lists 71. They share 20 problems — 23% of Cisco's bank and 28% of ServiceNow's. Focus on the overlap first, then drill into 67 Cisco-only and 51 ServiceNow-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 20 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Cisco and ServiceNow.
Step 2 — Company-specific depth: Add Cisco-specific problems like House Robber, Predict the Winner, Lucky Numbers in a Matrix and ServiceNow-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: ServiceNow skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
20 Shared Questions
High-priority problems to practice for both Cisco and ServiceNow.
| Problem | Difficulty |
|---|---|
| Longest Palindromic Substring | Medium |
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Maximum Subarray | Medium |
| Two Sum | Easy |
| Valid Parentheses | Easy |
| Trapping Rain Water | Hard |
| Longest Substring Without Repeating Characters | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Letter Combinations of a Phone Number | Medium |
| Number of Islands | Medium |
| Move Zeroes | Easy |
| Reverse Linked List | Easy |
| Gas Station | Medium |
| Group Anagrams | Medium |
| Top K Frequent Elements | Medium |
| Subarray Sum Equals K | Medium |
| Reverse Words in a String | Medium |
| Zigzag Conversion | Medium |
| Sliding Window Maximum | Hard |
Unique to Cisco (67)
Problems in Cisco's list that do not appear at ServiceNow.
| Problem | Difficulty |
|---|---|
| House Robber | Medium |
| Predict the Winner | Medium |
| Lucky Numbers in a Matrix | Easy |
| Rotate Image | Medium |
| Spiral Matrix | Medium |
| Fizz Buzz | Easy |
| Snakes and Ladders | Medium |
| Number of Valid Words in a Sentence | Easy |
| Maximum Difference Between Increasing Elements | Easy |
| Find Third Transaction | Medium |
| Implement Router | Medium |
| Word Search II | Hard |
Unique to ServiceNow (51)
Problems in ServiceNow's list that do not appear at Cisco.
Frequently Asked Questions
How many LeetCode questions do Cisco and ServiceNow share?
Cisco and ServiceNow share 20 LeetCode interview questions. 67 problems appear only in Cisco's list and 51 appear only in ServiceNow's list.
What topics overlap most between Cisco and ServiceNow?
The most common shared topics between Cisco and ServiceNow are Array (12 shared questions), String (7 shared questions), Hash Table (7 shared questions), Two Pointers (4 shared questions), Dynamic Programming (4 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Cisco or ServiceNow?
Cisco has 24 Easy, 50 Medium, and 13 Hard questions. ServiceNow has 7 Easy, 51 Medium, and 13 Hard questions. ServiceNow has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Cisco and ServiceNow?
Start with the 20 shared problems since they cover what both companies ask most often. Then add 20 Cisco-specific and 20 ServiceNow-specific questions to round out your prep.