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AZ-104: Prerequisites for Azure administrators, Route-based VPN type…

- - - - Custom Script Extension - Download and execute scripts on Az VMs. for post-deployment configuration, software installation, or other. Integrates with Az Resource Manger templates, also with Az CLI, Az PowerShell, Az Portal, REST API. Use script to install custom or other OS when deploying VM Scale Sets.
    - - Custom Deployment - only options that you can configure is Subcription, Resource Group and Location, when setting up a custom deployment option.
    - - Web Server Logging - Feature to deal with raw HTTP request data, see log messages about issues with web apps.
    - - **Session Persistence Rule - specifies that traffic from a client should be handled by same VM in backend pool for duration of session**. 3 settings, None, Client IP, Client IP and Protocol.
    - - Scale up and Scale out - this will improve vCPU performance of VMs. Scale up will increase it's size in response to workload. Scale out = use multiple VMs, some apps don't support the use of multiple VMs, so you have to use scale up.
  - - - Stop the Backup of VM first before deleting the backup recovery vault. Can't delete vault without removing dependencies.
    - - "Search in (TableName) "value" or search in (EventLogs) "error" to find a log entry with an error.
      - Azure Log Analytics workspace - Collect data from **Az resources** in your subscription, On-Premises computers monitored by System Center Operations Manager, Device collections from Configuration Manager, Diagnostics or log data from Azure Storage.
      - Action Rules - Help you define or suppress actions at any Az Resource Manager scope (Az subcription, resource group, or target resource)
        Action Group - Collection of notification preferences defined by the owner of an Az subcription. Az use action groups to notify users that an alert has been triggered. Each signal type uses one alert rule. Users are the Action group.
  - - - Configure settings - To allow to add local administrators that will manage joined devices in Microsoft Entra.
    - - MS Entra Registered devices - Devices that are personally owned or mobile devices, and are signed in with personal MS account or another local account.
        MS Entra Joined devices - Owned by an organization, and are signed in with MS Entra account belonging to that organization. They exist only in the cloud.
        MS Entra Hybrid joined devices - Owned by Organization, and are signed in with Active Directory Domain Services account belonging to that organization. Exist in cloud and on-premisses.
        User admin can add device, others can't.
  - - - Load balancing and Application gateway - use an az Application gateway and Internal Load balancer when to distribute resources that are inside of virtual network; app gateway will only allow internal traffic and not expose data to external **internet**.
      - Load Balancer Standart SKU - Can load balance VM's in other Subnets and/or Availability sets within the same Virual Network/Vnet.
        Backend Pool - Defines the group of resources to which the load balancer **distributes traffic**.
    - - DNS zone migration - you can only use **Azure CLI and Azure Portal**.