Tell me about a time you dealt with a difficult customer (high frequency question) High Availability for Database server "What is Docker and its use cases, followed by the deep dive into container environment What is a container and concepts around it. Technologies that allow/run containers (that are not in AWS)." What components would you use to build an eCommerce? How to troubleshoot slowness on a system What happens when you enter a website in the computer browser? What is DNS zone? What is DNS cache and how it works? What is traceroute and how is it created? Types of DNS records? How does a session get established in TCP? What are the use cases for UDP? How is UDP different from TCP? How does HTTP get secured? If client A and client B have public key, can they decrypt each other sessions? What is a container and concepts around it. Technologies that allow/run containers (that are not in AWS). How would you protect yourself against DNS poisoning or other DNS attacks? Difference between SQL and NoSQL. Use cases for NoSQL. How would you troubleshoot a performance issue on Windows server. What tools would you use and how? Name some languages that do not need a compiler and what are their advantages? What is the black/red environment setup? Explain a 3 tier architecture. Database is the one you picked and how it's different from other databases DAS vs NAS vs SAN. Types of file systems they support Explain concept of microservices Explain differences between ALB vs NLB What is a table scan. What is deduplication Is compression and deduplication the same thing? If not , why? Basic networking, CDN, architecture design, kubernetes, previous projects What happens when you enter "www.google.com" in your web browser? How would you find out what process was spiking the CPU on a Windows server while you were not on the machine? How do you minimize downtime to an application so you can roll out upgrades/perform maintenance? What is HTTPS and what does it protect against? What is VLAN, what is cloudfront? how do you set it up, what are the diffrent types of storage LDAP What is Linux Kernel? What is it for and how is it used in a boot sequence? DNS, what is it and how does it work? TCP Stack deep dive on an example. DDoS attack and how would you defend from it? Bare Servers vs Virtual Machines vs Docker, their comparison and the use cases. Relational vs NoSQL databases, Deep dive. Data Warehouses, real-life examples and applications. Microservices and their applications on a real-life example Tshooting websit with bad performance Data base types and how to do scaling or increase resources. cashing and it's usage . Load balancer types and which one is preferred over the other. Experience about scripting (any language) Explain the difference between network loadbalancer and application loadbalancer I got one request passing through a load balancer connected to two app servers, a web server and a DB server. Then all of the sudden the whole architecture becomes unresponsive: How would you start troubleshooting this? Database is slow: which resources would you need to increase/decrease to improve its performance? * Compute - Serverless CDN (Content Delivery Network) * Deployment and Management * Administration and Security * Big Data Analytics What is a Federation? What is a TLD (Top-Level Domain)? How is a hostname resolved from the command-line? How is an IP resolved to a domain name? What happens when you initiate a request to Google.com or another site? Explain the SSL HandShake. Give an example of a time where you had to troubleshoot Windows Network Slowness? What tools were used? (Use the STAR question format) How would you troubleshoot an issue with a Windows Process? Share a time in which this was done. (Use the STAR question format) What is CI (Continuous Integration)? What are Containers? What is Database Sharding? What is MapReduce? You have a 2-tier webapp with multiple webservers, a load balancer, and a database server. Customer says all webpages have been loading slow for the past 1 month. What would you do to identify the problem? Some question involving TCP stack and the difference between layer 4 and layer 7 What's a docker container? What's the difference from a VM? What are some of the problems of doing table scans in a database? What's sharding? What are some of the drawbacks of implementing it? Tell me how a packet is routed through the internet. Computer science questions: binary search, TSP, CI/CD, Agile software life-cyle, etc designing a physical data center Walk through troubleshooting connection/networking issues (general overview, then follow-up questions dive deeper). Walk through networking, VPN and DNS basics including how to deploy for scalability. Walk through how to make an existing cloud application more FT and HA. How would you identify and troubleshoot a DDoS attack? Describe Black/Red deployment technique, when and why to use it.