Q1: What is an Oracle Virtual Cloud Network (VCN)?
Answer: Oracle Virtual Cloud Network (VCN) is a modified private network created by Oracle Cloud Infrastructure (OCI). It provides isolation and control of network resources, allowing users to create and manage their own virtual networks in the cloud.
Q2: What are the main features of Oracle VCN?
Answer: The main components of an Oracle VCN are:
1)Subnet: A subnet is part of a VCN that can be used to isolate and manage network resources in a single domain.
2)Safe List: A safelist acts as a virtual machine and controls access to and from the subnet.
3)Routing Table: A routing table defines routing rules for network traffic in the VCN.
- Internet Gateway: The Internet Gateway provides communication between the VCN and the public Internet.
4)NAT Gateway: A network address translation (NAT) gateway allows private subnets to access the Internet while hiding their internal IP addresses.
5)Dynamic Routing Gateway: The dynamic routing gateway provides a connection between the VCN and the home network.
6)Service Gateway: Service Gateway provides access to Oracle services such as Oracle Object Storage without using the Internet.
Q3: How to connect different VCNs in Oracle Cloud Infrastructure?
Answer: There are several options for connecting different VCNs in Oracle Cloud Infrastructure:
1)VCN Peering: VCN Peering allows direct communication between VCNs in the same region or different regions without the need for gateway or VPN connection.
2)Transit Routing: Mass transit routing supports a hub and spoke architecture in which the central VCN acts as a hub and transit is used to connect multiple VCNs.
3)VPN Connection: VPN Connection creates a secure connection between VCNs or between a VCN and a home location on the Internet.
4)FastConnect: Oracle Cloud Infrastructure FastConnect offers dedicated connectivity options that allow VCNs to connect to home networks or other VCNs with high bandwidth and low latency.
Q4: How is the VCN secured in Oracle Cloud Infrastructure?
Answer: To protect your VCN in Oracle Cloud Infrastructure, you can follow the following best practices:
1)Network Security Groups: Use Network Security Groups to manage internal traffic inside and outside the subnet level by defining security rules.
2)SafeLists: Fix safelists to control traffic at subnet level.
3)Access Control List (ACL): Follow ACL to define VCN level access and exit rules.
4)Private Subnet: Put resources in a private subnet to block direct access to the Internet.
5)Bastion Host: Use a bastion host to securely access VCN addresses.
6)Virtual Private Network (VPN) or FastConnect: Use VPN or FastConnect to establish a secure connection between your VCN and your home network.
Q5: How about interest and breach in Oracle VCN?
Answer: Oracle VCN ensures availability and security through the following mechanisms:
1)Availability Domain (AD): Oracle Cloud Infrastructure is divided into multiple ADs in a domain, each AD has independent power, air conditioning, and central network .
Distributing resources across multiple ADs provides flexibility in the event of a failure.
2)Fault Domains (FD): In each AD, Oracle divides resources into fault domains to ensure that a fault in one fault domain does not affect resources in another fault domain.
3)Regional Subnets: By extending subnets to multiple ADs, regional subnets can be immune from connection even if AD fails.