Elena learned the dark magic of , where hosts whisper to routers, "I want this channel." She learned the PIM (Protocol Independent Multicast) language— PIM Sparse-Mode being the butler who only sends data when someone explicitly requests a subscription, versus PIM Dense-Mode which floods the house first and cleans up later.
While the examples use Cisco IOS, Doyle explains the logic of the protocols. This makes the knowledge transferable to Juniper, Arista, or Nokia environments. Routing TCP IP- Volume II -CCIE Professional Development
She was standing at a crossroads. To her left, a road sign read "Classful Forest." To her right, a massive, bustling interchange labeled "BGP AS 65001." Elena learned the dark magic of , where