Microsoft Azure Essentials Fundamentals of Azure Second Edition e-optimized 5x11 pdf



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9781509302963 Microsoft Azure Essentials Fundamentals of Azure 2nd ed pdf

Virtual Network 
In an on-premises physical infrastructure, you may have many components that all allow you to 
operate your virtual machines in a scalable and secure manner. These components could include 
equipment such as separate network spaces for Internet-facing and backend servers, load balancers, 
firewalls, and more. Many of these components can logically be deployed in an Azure Virtual Network 


75 
CHAPTER 3  |    Azure Virtual Machines 
 
(often referred to as VNET). Azure Virtual Network provides many similar features, such as the 
following: 
 
Subnet  A subnet is a range of IP addresses within a virtual network. A VM must be placed in a 
subnet within the VNET. VMs placed in one subnet of a VNET can freely communicate with VMs in 
another subnet of the same virtual network. However, you can use network security groups 
(NSGs) and user-defined routes to control such communication. 
 
IP address  An IP address can be either public or private. Public IP addresses allow 
communication from the Internet to the VM. A public IP address can be allocated dynamically—
that is, created only when the associated resource (such as a VM or load balancer) is started and 
released when said resource is stopped—or statically, in which case the IP address is assigned 
immediately and persists until deleted. Private IP addresses are non–Internet routable addresses 
used for communication with VMs and load balancers in the same VNET. 
 
Load balancer  VMs are exposed to the Internet or other VMs in a VNET by using Azure load 
balancers. There are two types of load balancers: 
 

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