Top SRE Interview Questions & Answers
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No.
Questions
1
Write Efficient data structure for a particular query?
2
Shuffle an array, make sure every element is not on the previous position
3
Implement a data structure that supports the operations flipBits(ith bit, # of bits) and getBit(ith bit), billions of possible bits, <= O(n log n) preferably?
5
Print a tree
6
How to find if two binary trees have the same structure?
7
Given an array of integers find indices I < j < k such that a[I] < a[j] < a[k].
8
Do you have any recent personal projects?
9
What is graph traversal?
10
What is a tree?
11
Given a collection of ads (data structure given), what is the mean and median of the array?
12
Find the Height of a Binary Search Tree?
13
Write a program in C, that implements a shell's facilities for (1) initiating a background process, and (2) command line pipes.
14
Asked me the difference between a hard and soft link in Linux
15
Find all pairs of 3 in an array that add to n.
16
What's 2^32
17
Merging intervals
18
Merge lists/arrays
19
Implement read() using read4k()
20
1 round of distributed system and large scale system design
21
Compress string "aabcaaaaade" to "aabc5xade". Only compress if it shortens the string. 5xa means char a is repeated 5 times.
22
Question on 2 lists and their union/ intersection/ remove elements present in L1 which are also present in L2
23
Basic list processing
24
What information is contained in a file inode?
25
HashMap/Hashtable questions?
26
Design a "snakes" game
27
networking, java, and linux/unix
28
Linux system call for inode data
29
[How would you design a real-time sports data collection app] (#at-are-laravel-scout-search-and-algolia)
30
Made me do a regex of getting just the phone numbers out of a contacts.txt file over Google Docs
31
large scale systems design detail
32
design a phone number search tools
33
bit manipulation
34
familiarity with Unix/Linux Internals
35
familiarity with TCP/IP
36
which system call returns inode information
37
What signal does the "kill" command send by default
38
How many IP addresses are usable on a /23 network
39
Can you describe a connection setup in TCP
40
Filesystems, networking, scripting
41
Implement a hash table
42
What's the default signal used in a kill command?
43
describe exactly what happens when you type 'telnet google.com 80' at a bash prompt, including shell interpretation, network connections
44
What happens when I type "ps" into a UNIX prompt?
45
How does RAID work?
46
Something about how a switch works in its internals.
47
How would you design a thumbnail service?
48
String manipulation, Trees, Graphs and recursion.
49
Given a data structure of rows (source, ratio, destination), find the value of conversion for a given source to a given destination. Example (EUR, 1.23, GBP)
50
How many IP addresses does a network have with a netmask of 21
51
Questions about sorting algorithms and their efficiency. Which one is faster, merge sort or bubble sort? As well as the Big O Notation
52
Troubleshoot a production incident
53
Design the architecture of a system and plan capacity for it
54
How does fork() work?
55
Remove chars at first string from second string
56
Best and worst case of Quicksort
57
How would you design hangouts
58
Explain linux virtual memory
59
Simple questions such as maximum length of binary tree (n, as it could be unbalanced)
60
Given a numerym (first letter + length of omitted characters + last letter), how would you return all possible original words? E.G. i18n the numeronym of internationalization
61
large systems design?
62
theoretical best trans-continental round-trip ping time
63
Find the shortest path between two words (like "cat" and "dog), changing only one letter at a time.
64
number of bit in mac address
65
3 first packet in tcpip connection?
66
what a AAAA record?
67
Write the tail program, in C, on the whiteboard
68
Write a function to return the most frequently occurring number in a list (the mode).
69
Describe Linux from its kernel level?
Its an opensource PHP framework used for CMS, website creation and ecommerce.
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Which year was WordPress released? 2003
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What are minimum requirements to run WordPress? PHP, MYSQL, Apache.
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List some features of WordPress. ...
What is a plugin in WordPress? List plugin that comes with WordPress. ..
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What is the difference between wordpress.com and wordpress.org WordPress.com is cloud hosted WordPress while WordPress.org is the cummunity edition.
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Where is WordPress content stored?
wp_posts
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What are the differences between Posts and Pages?
...
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What are the types of hooks in WP and what are their functions? Filters and actions.
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When we type a URL, a request is sent to the server. The server goes from /public to bootstrap folder from which is goes to the routes file. The route files sends it the right controller/view.
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Migrations help us keep SQL tables in code. When we have to setup the DB, we just run the migration.
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How do you enable debug mode in WP? Service providers are responsible for booting and configuration (binding all resources.)
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What is a WordPress taxonomy? Middleware checks for authentication.
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Object oriented and Model based way of DB query
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How many default tables are the WordPress, Can you list them? The ORM wrapper Laravel uses is called Eloquent. Every table has a model associated with it.
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What is default table prefix for wordpress?
A database wrapper that makes it easy to access DB.
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Facades are used to hide implementation details and complexities from end user making him/her feel like interacting with a black box.
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What are disadvantages of WordPress? Repository pattern is used to create templates where implementation details are left to be implemented in child classes. It helps with further expansion of code and avoid bottlenecks in class updation.
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What is the difference between installing and activating a theme? Passport provides a better way to create API.
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Which ‘meta box’ is not hidden by default on Post and Page screens?
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What is the difference between the two URLs in General Settings? (Hint: WordPress Address AND Site Address). Configured using config/cache.php. Used for database caching. Popular ways Redis and Memcache.
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What are Importers in WordPress? Writing a test for every unit (function or class) you write.
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What do you mean by the custom field in WordPress? Using PHP's mail() function amnd Laravel's sendmail() function. You can custoimize it using templates.
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In WordPress, objects are passed by value or by reference? Queue is a line of jobs to be proccessed. You can create multiple queues which is multiple lines of jobs
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What is the loop in WordPress? Job is a task being performed in the background.
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Use Laravel's sendmail() function and create a mail template.
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) How can you disable comments in WordPress?
Complex eloquent queries are called advanced eloquent. Query builder is wrapper for database queries.
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Which JS frameworks do you know?
Error handling is managing exception in a Laravel application.
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1 yard of string cost $0.10 . If you have 60 cents how many strings can you buy?
Use api.php. Link will be x.com/api/slug
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How to create a WordPress child theme and why should we create a child theme?
You get notified when an action is triggered.
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Can we create a child plugin like child theme? Which listen to the events.
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What plugins are you familiar with in WP? Payment processing is difficult. Cashier is a package which makes it easy. Its installed using composer.
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How would you change all the occurrences of “Hello” into “Good Morning” in post/page contents, when viewed before 11AM? Test is written first and then the function is written.
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What is the $wpdb variable in WordPress? Larvel uses composer which gets packages. You can develop your own package and submit.
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How to add a script in WordPress?
https://laravel.com/docs/5.8/scout
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How to add a style in WordPress? Socialite is Social login for Laravel.
Auth is Laravel's authentication.
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In easy way to do SPA where you can change state.
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Go to config/database.php
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Add the entry to config/database.php
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What are the requirements of Wordpress? Lumen is the lightweight version of Laravel used usually for making microservices.
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How to turn on debugging in WordPress? Key-value database making query faster.
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Key-value database making query faster.
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By adding more servers we scale horizontally.
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How to recover from a hack? By increasing the size of the same server we scale vertically.
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Can Deactivated Plugins Slow Down a WP Website? There is single URL. The assets are loaded once and only content keeps changing using JSON request. Its not great for SEO but there are workarounds to create virtual URL.
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What are the types of hooks in WordPress and mention their functions? There are many services which are similar sized. Each performs exactly one function and they talk to each other.
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What is the prefix of WordPress tables by default?
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There are many services which are similar sized. Each performs exactly one function and they talk to each other.
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How can you disable the WordPress comment?
Validations are used to make sure input is of the kind function wanted. Custom validators are custom made valiators.
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What is white screen of death? Composer is PHP's package manager.
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What are the plugins you can use to create a contact form in WordPress?
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Describe WordPress files and directory structure Caching of routes to make going to routes faster. Command: php artisan route:cache
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What are Default packages?
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How to get a website URL in WordPress? You can give route a name using a parameter.
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How to secure in our WordPress site? Laravel injects dependencies as function parameters.
Read more: https://medium.com/a-young-devoloper/how-laravel-injects-our-dependencies-14e1b1a044e
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How to change the homepage URL in WordPress? https://laravel.com/docs/7.x/contracts
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How to display custom Post in WordPress?
You can enable logging queries and Laravel will record the queries which were run.
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What is wp_footer() in WordPress?
They solve diamond problem which is when you have to inherit from two classes.
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How to add custom dynamic sidebars in WordPress?
Used for grouping stuff like route groups (CRUD in one line.)
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How to Create a Widget in WordPress? PHP version, MySQL, PHP packages mentioned on Laravel.com, apache server
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What is a permalink in WordPress? Max, min, sum etc
$price = DB::table('orders')->max('price');
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How do you create a page template? A single object of a class is created throughout the lifecycle.
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How to make any others pages to front page in WordPress?
To generate the process of generating the URL which leads to a route. Its used in MVC apps. You can use it using named routes in laravel.
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Why WordPress is the best CMS? Guzzle
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What are the difference between post and page in WordPress? Answer: Subquery, union.
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Explain the usermeta function in WordPress. php artisan list
php artisan make:migrate
php artisan make:controller
php artisan make:model
php artisan config:clear
php artisan serve
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Explain Avatar in WordPress? Session is data related to a specific user.
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What is Category in WordPress? Cookies is generalized data.
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