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It is not possible to route a MAC address since it works on a layer above Ethernet. To understand why IP addressing is used in a computer network or over the internet you need to understand how IP routing works. Basic IP Routing When your computer (PC1) wants to send a packet to some IP address (IPv4) like x.x.x.x, then the first check is if the destination address is in the same IP network as the PC1 itself. If x.x.x.x is in the same network, then the destination IP can be reached directly, otherwise the packet needs to be sent to the route configured on PC1 and if a route for the destination network / host is not configured explicitly, the packet is routed to the default gateway configured on PC1. Well that was about how IP routing works at a very high-level. Routers also use dynamic routing protocols and algorithms to find the best possible path. MAC addresses Once the packet has reached the local network of the destination computer, the communication happens over

Horizontal Scaling means that you scale by adding more machines   into your pool of resources whereas  Vertical Scaling means that you scale by adding more power (CPU, RAM) to an existing machine . Alternative term for Horizontal and Vertical Scaling is also known as Scale Out and Scale Up respectively. Scale up : Get more CPU, memory, disk space, and extra features like dedicated virtual machines (VMs), custom domains and certificates, staging slots, autoscaling, and more. You scale up by changing the pricing tier of the App Service plan that your app belongs to. Scale out : Increase the number of VM instances that run your app. You can scale out to as many as 30 instances, depending on your pricing tier.  App Service Environments  in  Isolated  tier further increases your scale-out count to 100 instances. For more information about scaling out, see  Scale instance count manually or automatically . There, you find out how to use autoscaling, which is to scale instance