How does DNS work and what types of records are encountered?
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31
DevOps
What is the key difference between TCP and UDP? Provide examples of applications for each protocol.
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31
What does an HTTP request and response consist of? Which HTTP methods and status codes are most commonly used?
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29
A connection to the database fails with an error. What could be the problem and how to diagnose it?
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27
What is load average, how is it calculated, and what does it show?
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26
You need to reach a remote server. What steps will you take for diagnosis? How to check the availability of a remote port?
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22
Explain the difference between MAC and IP addresses: why is each needed? Can a local network operate without IP addresses?
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22
What are the most commonly used Dockerfile instructions? How do ENTRYPOINT and CMD differ?
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20
What main Kubernetes resources are usually described in a Helm chart? What is the purpose of Ingress and which resources are used for traffic egress from the cluster?
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19
What version control systems have you worked with?
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19
CPU is lightly loaded and memory is free, but the application still lags. What could this mean?
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16
What is Kubernetes and why is it needed? What are the main components of a Kubernetes cluster?
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14
Which utilities are used to search for a file by name and substring inside a file?
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14
What types of networks does Docker use and which one do you use most often?
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11
What happens when a computer sends a packet to another computer: how does it find out the recipient's MAC address and what changes if the recipient is in a different subnet?
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11
Which service meshes have you used? When is a service mesh needed? What is a circuit breaker?
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8
What is the difference between git merge and git rebase? When should each approach be used?
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6