{"id":24299,"date":"2025-05-13T07:28:00","date_gmt":"2025-05-13T01:58:00","guid":{"rendered":"https:\/\/cloudsoftsol.com\/2026\/?p=24299"},"modified":"2025-05-13T07:28:41","modified_gmt":"2025-05-13T01:58:41","slug":"aws-vpc-azure-networking-interview-questions-4-6-years-experience","status":"publish","type":"post","link":"https:\/\/cloudsoftsol.com\/2026\/news\/aws-vpc-azure-networking-interview-questions-4-6-years-experience\/","title":{"rendered":"AWS VPC Interview Questions (4\u20136 Yrs Experience)"},"content":{"rendered":"\n

VPC Basic to Intermediate Concepts (AWS)<\/h2>\n\n\n\n
    \n
  1. What is a VPC and why is it needed in AWS?<\/li>\n\n\n\n
  2. What are the key components of a VPC?<\/li>\n\n\n\n
  3. Differentiate between public and private subnets.<\/li>\n\n\n\n
  4. How do you make a subnet public or private?<\/li>\n\n\n\n
  5. What is the difference between a route table and a network ACL?<\/li>\n\n\n\n
  6. How do security groups and NACLs differ?<\/li>\n\n\n\n
  7. What is the CIDR range and how do you plan it in VPC design?<\/li>\n\n\n\n
  8. What is the purpose of an Internet Gateway (IGW)? Can you attach it to multiple VPCs?<\/li>\n<\/ol>\n\n\n\n
    \n\n\n\n

    Advanced Configuration and Real-Time Scenarios (AWS)<\/h2>\n\n\n\n
      \n
    1. How would you connect two VPCs? What are the pros and cons of VPC Peering vs Transit Gateway?<\/li>\n\n\n\n
    2. Can you explain how NAT Gateway works? When would you use it?<\/li>\n\n\n\n
    3. Have you configured VPN or Direct Connect in a VPC? What are the use cases?<\/li>\n\n\n\n
    4. How do you secure a VPC to allow access only from a specific IP range or service?<\/li>\n\n\n\n
    5. How would you troubleshoot connectivity issues in a VPC?<\/li>\n\n\n\n
    6. Can a private subnet access the internet? If yes, how?<\/li>\n\n\n\n
    7. Explain how DNS resolution works in a VPC.<\/li>\n<\/ol>\n\n\n\n
      \n\n\n\n

      Design and Best Practices (AWS)<\/h2>\n\n\n\n
        \n
      1. How would you design a VPC for a multi-tier application (Web, App, DB)?<\/li>\n\n\n\n
      2. What best practices do you follow for subnetting and IP range planning?<\/li>\n\n\n\n
      3. What is a flow log in VPC? What insights can you gain from it?<\/li>\n\n\n\n
      4. What is the impact of overlapping CIDR blocks in VPC peering?<\/li>\n\n\n\n
      5. How would you design a VPC for high availability and fault tolerance?<\/li>\n<\/ol>\n\n\n\n
        \n\n\n\n

        Scenario-Based Questions (AWS)<\/h2>\n\n\n\n
          \n
        1. You are asked to allow external users to access a web app hosted in a private subnet. How would you do it securely?<\/li>\n\n\n\n
        2. A VPC peering connection is established, but traffic is not flowing. What would you check?<\/li>\n\n\n\n
        3. Your NAT Gateway is costing too much. What alternatives would you consider?<\/li>\n\n\n\n
        4. You need to allow your EC2 instances in private subnets to pull data from S3 without going over the internet. How would you achieve that?<\/li>\n\n\n\n
        5. How do you restrict SSH access to only a jump box or bastion host in a VPC?<\/li>\n<\/ol>\n\n\n\n
          \n\n\n\n

          VNet Security and NSGs (Azure)<\/h2>\n\n\n\n
            \n
          1. What is a Network Security Group (NSG)? How does it work?<\/li>\n\n\n\n
          2. How are NSGs different from Azure Firewall?<\/li>\n\n\n\n
          3. Where can you associate an NSG in Azure (subnet vs. NIC)?<\/li>\n\n\n\n
          4. What happens if you apply NSGs at both subnet and NIC levels?<\/li>\n\n\n\n
          5. Can NSGs be used to block traffic between subnets? How?<\/li>\n\n\n\n
          6. What are Application Security Groups (ASGs) and how are they used in NSGs?<\/li>\n\n\n\n
          7. Can NSGs be applied to VPN Gateway subnets? Why or why not?<\/li>\n\n\n\n
          8. How do you monitor and troubleshoot denied NSG traffic?<\/li>\n\n\n\n
          9. What is the default behavior of NSG inbound and outbound rules?<\/li>\n\n\n\n
          10. Can you restrict RDP or SSH access using NSGs securely?<\/li>\n<\/ol>\n\n\n\n
            \n\n\n\n

            Flow Logs (Azure)<\/h2>\n\n\n\n
              \n
            1. What are Network Watcher Flow Logs in Azure?<\/li>\n\n\n\n
            2. How do flow logs help in troubleshooting and security auditing?<\/li>\n\n\n\n
            3. What are the retention options for flow logs in Azure?<\/li>\n\n\n\n
            4. Can flow logs be integrated with other tools like Log Analytics or Sentinel?<\/li>\n\n\n\n
            5. What is the performance impact of enabling flow logs?<\/li>\n\n\n\n
            6. What is the difference between NSG flow logs version 1 and version 2?<\/li>\n\n\n\n
            7. How would you use flow logs to detect suspicious activity?<\/li>\n\n\n\n
            8. Can you visualize NSG flow logs? If so, how?<\/li>\n\n\n\n
            9. What are common scenarios where flow logs are crucial?<\/li>\n\n\n\n
            10. How do flow logs work with peered VNets?<\/li>\n<\/ol>\n\n\n\n
              \n\n\n\n

              VNet Peering (Azure)<\/h2>\n\n\n\n
                \n
              1. What is VNet Peering in Azure and how does it differ from VPN Gateway connections?<\/li>\n\n\n\n
              2. What is the difference between global and regional peering?<\/li>\n\n\n\n
              3. Can you apply NSGs between peered VNets?<\/li>\n\n\n\n
              4. Can you use overlapping IP ranges in VNet peering? Why or why not?<\/li>\n\n\n\n
              5. What happens if you delete a peering connection from one side only?<\/li>\n\n\n\n
              6. What limitations should be considered when planning for transitive peering?<\/li>\n\n\n\n
              7. Can you use custom DNS across peered VNets?<\/li>\n\n\n\n
              8. Is traffic between peered VNets encrypted?<\/li>\n\n\n\n
              9. How does bandwidth cost work in VNet peering?<\/li>\n\n\n\n
              10. Can you peer VNets across different Azure subscriptions or tenants?<\/li>\n<\/ol>\n\n\n\n
                \n\n\n\n

                Azure Firewall<\/h2>\n\n\n\n
                  \n
                1. What is Azure Firewall? How is it different from NSGs and Application Gateway?<\/li>\n\n\n\n
                2. How do you deploy Azure Firewall in a hub-and-spoke architecture?<\/li>\n\n\n\n
                3. What are Firewall policies and how do they simplify rule management?<\/li>\n\n\n\n
                4. How does threat intelligence-based filtering work in Azure Firewall?<\/li>\n\n\n\n
                5. Can Azure Firewall perform TLS inspection?<\/li>\n\n\n\n
                6. How does Azure Firewall handle DNS filtering?<\/li>\n\n\n\n
                7. What\u2019s the difference between Azure Firewall and a third-party NVA?<\/li>\n\n\n\n
                8. What are NAT and DNAT rules in Azure Firewall?<\/li>\n\n\n\n
                9. Can you use Azure Firewall with Forced Tunneling?<\/li>\n\n\n\n
                10. How do you monitor and log traffic through Azure Firewall?<\/li>\n<\/ol>\n\n\n\n
                  \n\n\n\n

                  VPC Security and Network ACLs \/ Security Groups (AWS)<\/h2>\n\n\n\n
                    \n
                  1. What is the difference between Security Groups and Network ACLs in AWS?<\/li>\n\n\n\n
                  2. Can you block a specific IP using a Security Group?<\/li>\n\n\n\n
                  3. How do you design security for a multi-tier app in a VPC (Web, App, DB)?<\/li>\n\n\n\n
                  4. What are the default rules in a Security Group?<\/li>\n\n\n\n
                  5. How do you secure your EC2 instances in private subnets?<\/li>\n\n\n\n
                  6. What\u2019s the best practice to allow internal traffic between EC2s across different subnets?<\/li>\n\n\n\n
                  7. How would you allow only a specific IP to access port 22 of an EC2 instance?<\/li>\n\n\n\n
                  8. Can NACLs be stateful? What are the implications of that?<\/li>\n\n\n\n
                  9. What would happen if both NACL and SG allow the traffic in, but NACL denies it out?<\/li>\n\n\n\n
                  10. How do you control outbound traffic to the internet from private subnets?<\/li>\n<\/ol>\n\n\n\n
                    \n\n\n\n

                    VPC Flow Logs (AWS)<\/h2>\n\n\n\n
                      \n
                    1. What are VPC Flow Logs and where can they be enabled?<\/li>\n\n\n\n
                    2. What kind of traffic can you capture using VPC Flow Logs (accepted, rejected, all)?<\/li>\n\n\n\n
                    3. Where can you send Flow Logs \u2013 CloudWatch or S3? What are the pros and cons?<\/li>\n\n\n\n
                    4. How can you use flow logs to troubleshoot connectivity issues?<\/li>\n\n\n\n
                    5. What are the limitations of VPC Flow Logs (e.g., UDP traffic capture)?<\/li>\n\n\n\n
                    6. How would you use flow logs to detect a DDoS or scanning attempt?<\/li>\n\n\n\n
                    7. What fields are included in a VPC flow log record?<\/li>\n\n\n\n
                    8. Can flow logs be enabled at the VPC level?<\/li>\n\n\n\n
                    9. Do VPC Flow Logs capture traffic to\/from Amazon DNS and VPC endpoints?<\/li>\n\n\n\n
                    10. How do you aggregate or visualize VPC Flow Logs for analysis?<\/li>\n<\/ol>\n\n\n\n
                      \n\n\n\n

                      VPC Peering (AWS)<\/h2>\n\n\n\n
                        \n
                      1. What is VPC Peering? What are its use cases?<\/li>\n\n\n\n
                      2. Can peered VPCs communicate across regions?<\/li>\n\n\n\n
                      3. What are the limitations of VPC Peering in terms of transitive routing?<\/li>\n\n\n\n
                      4. Can two VPCs with overlapping CIDR blocks be peered?<\/li>\n\n\n\n
                      5. How do route tables change when peering is configured?<\/li>\n\n\n\n
                      6. How do you troubleshoot traffic not flowing between peered VPCs?<\/li>\n\n\n\n
                      7. Can you use security groups across peered VPCs?<\/li>\n\n\n\n
                      8. How is VPC Peering billed?<\/li>\n\n\n\n
                      9. What\u2019s the difference between VPC Peering and Transit Gateway?<\/li>\n\n\n\n
                      10. Is VPC Peering encrypted by default?<\/li>\n<\/ol>\n\n\n\n
                        \n\n\n\n

                        AWS Network Firewall<\/h2>\n\n\n\n
                          \n
                        1. What is AWS Network Firewall and how does it differ from Security Groups and NACLs?<\/li>\n\n\n\n
                        2. What are stateful vs stateless rules in AWS Network Firewall?<\/li>\n\n\n\n
                        3. How do you deploy AWS Network Firewall in a centralized architecture?<\/li>\n\n\n\n
                        4. Can AWS Network Firewall inspect east-west traffic?<\/li>\n\n\n\n
                        5. What types of rule groups can you configure in AWS Network Firewall?<\/li>\n\n\n\n
                        6. How do you log and monitor traffic using AWS Network Firewall?<\/li>\n\n\n\n
                        7. What is the role of Suricata rules in AWS Network Firewall?<\/li>\n\n\n\n
                        8. How do you handle TLS traffic inspection with AWS Network Firewall?<\/li>\n\n\n\n
                        9. How does AWS Network Firewall integrate with Route Tables and Subnet routing?<\/li>\n\n\n\n
                        10. What are the limitations of AWS Network Firewall compared to third-party solutions?<\/li>\n<\/ol>\n\n\n\n
                          \n\n\n\n

                          Site-to-Site VPN (AWS)<\/h2>\n\n\n\n
                            \n
                          1. What is an AWS Site-to-Site VPN? How is it different from Client VPN?<\/li>\n\n\n\n
                          2. What components are needed to establish a Site-to-Site VPN connection?<\/li>\n\n\n\n
                          3. What are the two tunnels in a VPN connection used for?<\/li>\n\n\n\n
                          4. How does AWS ensure high availability in Site-to-Site VPNs?<\/li>\n\n\n\n
                          5. What encryption protocols are used in AWS VPN connections?<\/li>\n\n\n\n
                          6. What happens if one VPN tunnel goes down? How do you monitor failover?<\/li>\n\n\n\n
                          7. How do you configure BGP vs Static routing in AWS VPN?<\/li>\n\n\n\n
                          8. Can you connect multiple on-prem networks to the same VPC via VPN?<\/li>\n\n\n\n
                          9. What are the bandwidth and latency considerations for VPN vs Direct Connect?<\/li>\n\n\n\n
                          10. How would you troubleshoot a non-working VPN tunnel in AWS?<\/li>\n<\/ol>\n\n\n\n
                            \n\n\n\n

                            VPC Endpoints (AWS)<\/h2>\n\n\n\n
                              \n
                            1. What is the difference between an Interface Endpoint and a Gateway Endpoint?<\/li>\n\n\n\n
                            2. Which AWS services support Gateway Endpoints?<\/li>\n\n\n\n
                            3. How do VPC Endpoints enhance security for accessing AWS services?<\/li>\n\n\n\n
                            4. Can you use VPC Endpoints to restrict internet access for EC2 instances?<\/li>\n\n\n\n
                            5. What is PrivateLink and how does it relate to Interface Endpoints?<\/li>\n\n\n\n
                            6. How do you restrict access to an S3 bucket using a VPC Endpoint policy?<\/li>\n\n\n\n
                            7. Can you use VPC endpoints across accounts or regions?<\/li>\n\n\n\n
                            8. How do DNS names work for Interface Endpoints?<\/li>\n\n\n\n
                            9. What are the limitations of VPC Endpoints?<\/li>\n\n\n\n
                            10. Can VPC Endpoints be used with Transit Gateway?<\/li>\n<\/ol>\n\n\n\n
                              \n\n\n\n

                              AWS Direct Connect<\/h2>\n\n\n\n
                                \n
                              1. What is AWS Direct Connect and what are its key use cases?<\/li>\n\n\n\n
                              2. What\u2019s the difference between a public and private Direct Connect connection?<\/li>\n\n\n\n
                              3. How is Direct Connect different from a Site-to-Site VPN?<\/li>\n\n\n\n
                              4. What are Direct Connect Gateway and Virtual Interfaces (VIF)?<\/li>\n\n\n\n
                              5. How do you ensure redundancy and failover in Direct Connect?<\/li>\n\n\n\n
                              6. What is the minimum bandwidth offered in Direct Connect?<\/li>\n\n\n\n
                              7. Can you use Direct Connect for multiple VPCs? How?<\/li>\n\n\n\n
                              8. How does billing work with Direct Connect?<\/li>\n\n\n\n
                              9. What are the steps to configure Direct Connect from scratch?<\/li>\n\n\n\n
                              10. How do you secure your Direct Connect traffic?<\/li>\n<\/ol>\n\n\n\n
                                \n\n\n\n

                                AWS Transit Gateway<\/h2>\n\n\n\n
                                  \n
                                1. What is AWS Transit Gateway and why would you use it?<\/li>\n\n\n\n
                                2. How does Transit Gateway improve over traditional VPC peering?<\/li>\n\n\n\n
                                3. Can you explain the difference between attachments and route tables in TGW?<\/li>\n\n\n\n
                                4. What types of attachments are supported in TGW?<\/li>\n\n\n\n
                                5. How would you connect multiple VPCs and an on-prem data center using TGW?<\/li>\n\n\n\n
                                6. Can Transit Gateway support multicast traffic?<\/li>\n\n\n\n
                                7. How does traffic isolation work with multiple route tables in TGW?<\/li>\n\n\n\n
                                8. What are Transit Gateway Connect and TGW VPN attachments?<\/li>\n\n\n\n
                                9. What are the throughput limits of a Transit Gateway?<\/li>\n\n\n\n
                                10. How do you monitor and log Transit Gateway traffic?<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

                                  VPC Basic to Intermediate Concepts (AWS) Advanced Configuration and Real-Time Scenarios (AWS) Design and Best Practices (AWS) Scenario-Based Questions (AWS) VNet Security and NSGs (Azure) Flow Logs (Azure) VNet Peering (Azure) Azure Firewall VPC Security and Network ACLs \/ Security … <\/p>\n","protected":false},"author":1,"featured_media":24300,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-24299","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/cloudsoftsol.com\/2026\/wp-json\/wp\/v2\/posts\/24299","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cloudsoftsol.com\/2026\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cloudsoftsol.com\/2026\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cloudsoftsol.com\/2026\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cloudsoftsol.com\/2026\/wp-json\/wp\/v2\/comments?post=24299"}],"version-history":[{"count":1,"href":"https:\/\/cloudsoftsol.com\/2026\/wp-json\/wp\/v2\/posts\/24299\/revisions"}],"predecessor-version":[{"id":24301,"href":"https:\/\/cloudsoftsol.com\/2026\/wp-json\/wp\/v2\/posts\/24299\/revisions\/24301"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cloudsoftsol.com\/2026\/wp-json\/wp\/v2\/media\/24300"}],"wp:attachment":[{"href":"https:\/\/cloudsoftsol.com\/2026\/wp-json\/wp\/v2\/media?parent=24299"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cloudsoftsol.com\/2026\/wp-json\/wp\/v2\/categories?post=24299"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cloudsoftsol.com\/2026\/wp-json\/wp\/v2\/tags?post=24299"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}