Here is the second episode of my AZ-303 study notes series.
Video Notes
Virtual Networks
A VNET is an isolated container within Azure that provides network connectivity to resources.
Important components
Subnet: A VNET has one more more subnets. Resources that require network connectivity must reside in a subnet.
Address space: VNETs require one or more address spaces to provide private IP addresses to resources.
Important Considerations
Default connectivity: After creating a VNET, some connectivity is enabled by default. (Internet access, inter-subnet access).
Address range restrictions: Private IP address ranges are allowed. The smallest allowed is /29 and the largest is /8.
Reserved IP addresses: 5 IP addresses are reserved in each subnet. This includes the first 3 and last one. (x.x.x.0-3, x.x.x.255).
DNS and DHCP: Custom DNS can be configured for your VNET. DHCP is built-in and cannot be custom deployed.
Supported Protocols: VNETs support TCP, UDP, TCP/IP protocols.
Integrated Connectivity: VNETs are also built for various forms of integration. Including ExpressRoute, Private Link, VPN, and more.
Routing and Connectivity: NSG are more like a firewall, VNET routing is more about the actual pathway.
System Routes: Default routes configured by Azure to allow specific connectivity to work automatically.
Any subnet within a vnet will have outbound access to the internet.
Subnet to Subnet connectivity.
Custom Routes: User-defined routes which allow custom paths of communication to be enforced or blocked.
Route priority when you have multiple routes: Custom > BGP > System. The longest prefix match is always going to precedence first. a /32 will override a /24 when the other octets of the IP are matching.
Virtual Machines
A VM allows you to deploy virtualized Windows or Linux machines. They are helpful when you want to migrate existing compute workloads to the cloud and deploy advance compute solutions.
Key Components
- Belongs to a resource group.
- Created in a specific region.
- Is configured with a given size that you can change also once it's created (requieres restart).
- Built from an image of an OS.
Virtual Machine Sizes
The size of a VM influences several characteristics:
- CPU resource allocation
- Total available memory
- Network Interface Card (NIC performance
- Storage (Azure Disks) performance
- Graphics capabilities
- Influences limits (maximum NICs, disks)
Available sizes for your VM depend on Whether the virtual machine is running and the location of the virtual machine.
Thanks for tuning in.
I plan on creating more content around Azure; it's great to share what I've been learning.
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Thanks for reading and possibly watching!
Top comments (1)
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