Can all the instances in a VPC can ping each other by default?

Yes. Instances in one region can communicate with each other using Inter-Region VPC Peering, public IP addresses, NAT gateway, NAT instances, VPN Connections or Direct Connect connections.

Can VPC communicate with each other?

Instances in either VPC can communicate with each other as if they were within the same network. Data can be transferred across these resources with more security.

What is the default VPC and what are its advantages?

Default VPC is a Virtual network which is automatically created for customer AWS account the very 1st time EC2 resources are provisioned. Another key benefit of Default VPC is that access to Internet is available by default and default VPC has an internet gateway and public subnets with corresponding route table.

Can subnets in a VPC talk to each other?

When you create new subnets within a custom VPC, by default they can communicate with each other, across availability zones.

What does a default VPC comes with?

All default VPCs will be associated with an IPv4 CIDR block with a 172.31. 0.0/16 address range. This will give you 65,536 possible IP addresses, minus some AWS reserved addresses. VPCs can be created with smaller CIDR blocks, such as a /20, which would yield 4091 possible addresses.

How can instances in private subnet of different VPC communicate with each other?

Instances launched into the subnets can receive IPv6 addresses. We do not support IPv6 communication over a Site-to-Site VPN connection on a virtual private gateway; however, instances in the VPC can communicate with each other via IPv6, and instances in the public subnet can communicate over the internet via IPv6.

Can subnets talk to each other?

Devices in different subnets can communicate. That is the purpose of a router. Routers route packets between different networks. Even if devices in different networks are on the same layer-2 broadcast domain, you need a router to let the devices communicate at layer-3.

Can VPC peering can be implemented with two VPCs having the same IP address ranges?

You cannot have more than one VPC peering connection between the same two VPCs at the same time. If the IPv4 CIDR block of a VPC in a VPC peering connection falls outside of the private IPv4 address ranges specified by RFC 1918, private DNS hostnames for that VPC cannot be resolved to private IP addresses.

Can a VPC span multiple Availability Zones?

A VPC spans all of the Availability Zones in the Region. The following diagram shows a new VPC with an IPv4 CIDR block. After you create a VPC, you can add one or more subnets in each Availability Zone. A subnet is a range of IP addresses in your VPC.

Can a VPC span multiple regions?

Amazon VPC is currently available in multiple Availability Zones in all Amazon EC2 regions. Q. Can a VPC span multiple Availability Zones? Yes.

Can NAT gateway be in private subnet?

You can create a NAT gateway for EC2 instances in a private VPC subnet to connect securely over the Internet. Because the subnet is private, the IP addresses assigned to the instances cannot be used in public.

Can we create additional subnets in default VPC?

You can use a default VPC as you would use any other VPC: Add additional nondefault subnets. Modify the main route table. Add additional route tables.

How do you check if a subnet is public or private?

‘private’. Public subnets have a default route to an Internet Gateway; private subnets do not. So, to determine if a given subnet is public or private, you need to describe the route table that is associated with that subnet. That will tell you the routes and you can test for a 0.0.

Should you use the default VPC?

Avoid them when using automation. On the networking side, the default VPC enables the assignment of public addresses in public subnets by default. This is a security no-no. If a developer errs in automation or the console, you don’t want the instance to be reachable by the Internet.

Can we create default VPC?

Amazon Virtual Private Cloud (VPC) now allows customers to create a new default VPC directly from the console or by using the CLI. With this release, customers no longer need to contact AWS support if the default VPC has been deleted, as they can create a new default VPC by using this self-service feature.

Should I delete the default VPC?

There shouldn’t be any problems if you delete the default VPC. You won’t get the default settings (like a public IP when creating an EC2 instance) in the VPC you created unless you explicitly define it.

ncG1vNJzZmivp6x7pbHKqKakrJmlwG%2BvzqZmn5mhZLCiuoyao6VlpJ2ybrXNrKuappOawG61zWaYZq6gmHqkrc1mp6Kml2Kyoq%2FHZqatoJWneqPFjJ2cn5mlocFvtNOmow%3D%3D