Add 24 new questions

README.md

@@ -3,7 +3,7 @@
 
 :information_source:  This repository contains interview questions on various DevOps related topics
 
-:bar_chart:  There are currently **461** questions
+:bar_chart:  There are currently **485** questions
 
 :warning:  You don't need to know how to answer all the questions in this repo. DevOps is not about knowing all :)
 
@@ -48,7 +48,7 @@
     <td align="center"><a href="#azure"><img src="images/azure.png" width="80px;" height="75px;" alt="azure"/><br /><b>Azure</b></a><br /><sub><a href="#azure-beginner">Beginner :baby:</a></sub><br><sub></td>
     <td align="center"><a href="#gcp"><img src="images/gcp.png" width="75px;" height="75px;" alt="gcp"/><br /><b>Google Cloud Platform</b></a><br /><sub><a href="#gcp-beginner">Beginner :baby:</a></sub><br><sub></td>
     <td align="center"><a href="#openstack"><img src="images/openstack.png" width="75px;" height="75px;" alt="openstack"/><br /><b>OpenStack</b></a><br /><sub><a href="#openstack-beginner">Beginner :baby:</a></sub><br><sub><a href="#openstack-advanced">Advanced :star:</a></sub></td>
-    <td align="center"><a href="#security"><img src="images/security.png" width="75px;" height="75px;" alt="security"/><br /><b>Security</b></a><br /><sub><a href="#security-beginner">Beginner :baby:</a></sub><br><sub></td>
+    <td align="center"><a href="#security"><img src="images/security.png" width="75px;" height="75px;" alt="security"/><br /><b>Security</b></a><br /><sub><a href="#security-beginner">Beginner :baby:</a></sub><br><sub><a href="#security-advanced">Advanced :star:</a></sub></td>
     <td align="center"><a href="#puppet"><img src="images/puppet.png" width="75px;" height="75px;" alt="puppet"/><br /><b>Puppet</b></a><br /><sub><a href="#puppet-beginner">Beginner :baby:</a></sub><br><sub><a href="#puppet-advanced">Advanced :star:</a></sub></td>
     <td align="center"><a href="#openshift"><img src="images/openshift.png" width="75px;" height="75px;" alt="OpenShift"/><br /><b>OpenShift</b></a><br /><sub><a href="#openshift-beginner">Beginner :baby:</a></sub><br><sub></td>
   </tr>
@@ -192,6 +192,10 @@ Stateful applications depend on the storage to save state and data, typically da
 
 ##### SRE
 
+<details>
+<summary>Compare SRE to DevOps</summary><br><b>
+</b></details>
+
 <details>
 <summary>What SRE team is responsible for?</summary><br><b>
 
@@ -206,6 +210,15 @@ One can argue whether it's per company definition or a global one but at least a
 <summary>What are MTTF (mean time to failure) and MTTR (mean time to repair)? What these metrics help us to evaluate?</summary><br><b>
 </b></details>
 
+<details>
+<summary>What is a post-mortem meeting? Why is it important?</summary><br><b>
+</b></details>
+
+<details>
+<summary>What is "infrastructure as code"? What implementation of IAC are you familiar with?</summary><br><b>
+</b></details>
+
+
 <a name="devops-advanced"></a>
 #### :star: Advanced
 
@@ -516,6 +529,14 @@ Stop the instance, the type of the instance to match the desired RAM and start t
 2. Read Replicas - for better performences
 </b></details>
 
+<details>
+<summary>What is EBS?</summary><br><b>
+</b></details>
+
+<details>
+<summary>What is VPC?</summary><br><b>
+</b></details>
+
 ## Network
 
 <a name="network-beginner"></a>
@@ -1094,6 +1115,10 @@ related to the file like its size, owner, permissions, etc.
 <summary>What is NTP? What is it used for?</summary><br><b>
 </b></details>
 
+<details>
+<summary>Explain Kernel OOM</summary><br><b>
+</b></details>
+
 <details>
 <summary>What is SELiunx?</summary><br><b>
 </b></details>
@@ -1183,6 +1208,24 @@ While an A record points a domain name to an IP address, a PTR record does the o
 <summary>How do you list the content of a package without actually installing it?</summary><br><b>
 </b></details>
 
+##### Applications and Services
+
+<details>
+<summary>What is a load balancer?</summary><br><b> 
+</b></details>
+
+<details>
+<summary>What load balancer algorithms are you familiar with?</summary><br><b>
+</b></details>
+
+<details>
+<summary>What is a proxy?</summary><br><b> 
+</b></details>
+
+<details>
+<summary>What is a reverse proxy?</summary><br><b> 
+</b></details>
+
 <a name="linux-advanced"></a>
 #### :star: Advanced
 
@@ -1788,6 +1831,10 @@ Swarm management which means you can create new swarms in Docker Cloud.
 Re-install the OS IS NOT the right answer :)
 </b></details>
 
+<details>
+<summary>What is sudo? How do you set it up?</summary><br><b>
+</b></details>
+
 ## Coding
 
 <a name="coding-beginner"></a>
@@ -1813,6 +1860,19 @@ Re-install the OS IS NOT the right answer :)
 <summary>Explain big O notation</summary><br><b>
 </b></details>
 
+##### Code Review
+
+<details>
+<summary>What are your code-review best practices?</summary><br><b>
+</b></details>
+
+<details>
+<summary>Do you agree/disagree with each of the following statements and why?:
+
+  * The commit message is not important. When reviewing a change/patch one should focus on the actual change</summary><br><b>
+  * You shouldn't test your code before submitting it. This is what CI/CD exists for.
+</b></details>
+
 ##### Strings
 
 <details>
@@ -3189,6 +3249,27 @@ the pseudo table to retrieve the sum of the prices spent by each customer, then
 <summary>How do you manage passwords in different tools and platforms?</summary><br><b>
 </b></details>
 
+<details>
+<summary>Explain the following:
+
+  * Vulnerability
+  * Exploits
+  * Risk
+  * Threat</summary><br><b>
+</b></details>
+
+<details>
+<summary>What is XSS?</summary><br><b>
+</b></details>
+
+<details>
+<summary>What is an SQL injection? How to manage it?</summary><br><b>
+</b></details>
+
+<details>
+<summary>What is Certification Authority?</summary><br><b>
+</b></details>
+
 <details>
 <summary>How do you identify and manage vulnerabilities?</summary><br><b>
 </b></details>
@@ -3197,10 +3278,18 @@ the pseudo table to retrieve the sum of the prices spent by each customer, then
 <summary>Explain "Privilege Restriction"</summary><br><b>
 </b></details>
 
+<details>
+<summary>What types of firewalls are there?</summary><br><b>
+</b></details>
+
 <details>
 <summary>What is DDoS attach? How do you deal with it?</summary><br><b>
 </b></details>
 
+<details>
+<summary>What is the difference between asynchronous and synchronous encryption?</summary><br><b>
+</b></details>
+
 <details>
 <summary>Explain Man-in-the-middle attach</summary><br><b>
 </b></details>
@@ -3209,10 +3298,27 @@ the pseudo table to retrieve the sum of the prices spent by each customer, then
 <summary>Explain CVE and CVSS</summary><br><b>
 </b></details>
 
+<details>
+<summary>What is ARP Poisoning?</summary><br><b>
+</b></details>
+
 <details>
 <summary>Describe how do you secure public repositories</summary>
 </b></details>
 
+<details>
+<summary>How do cookies work?</summary><br><b>
+</b></details>
+
+<details>
+<summary>Do you think open source project is more secured when compared to a proprietary software?</summary><br><b>
+</b></details>
+
+<details>
+<summary>Explain OAuth</summary><br><b>
+<a name="puppet-advanced"></a>
+</b></details>
+
 ##### Containers
 
 <details>
@@ -3223,6 +3329,13 @@ the pseudo table to retrieve the sum of the prices spent by each customer, then
 <summary>Explain what is Docker Bench</summary><br><b>
 </b></details>
 
+<a name="security-advanced"></a>
+#### :baby: Advanced
+
+<details>
+<summary>Explain MAC flooding attach</summary><br><b>
+</b></details>
+
 ## Puppet
 
 <a name="puppet-beginner"></a>