Static routing - involves manually configuring routers with specific paths to reach network destinations, Border gateway protocol (BGP) - Essential for inter-domain routing on the internet. Uses path attributes to select the best route., Enhanced interior Gateway routing protocol (EIGRP - Enhanced distance-vector protocol. Combines features of distance- vector and link-state protocols., Open shortest path first (OSPF) - Link-state routing protocol. Fast convergence and supports large networks., route selection - process of selecting paths in a network along which to send network traffic., administrative distance - metric used by routers to rank the trustworthiness of routes received from different routing protocols., prefix length - specifies the number of contiguous bits of the network mask that are set to 1., Metric - used by routing protocols to evaluate the cost of path traversal, NAT - translates one IP address to another IP address, Port address translation (PAT - often referred to as NAT overload, allows multiple devices on a local network to be mapped to a single public IP address but with a different port number for each session., First hop redundancy protocol (FHRP) - set of protocols that create a virtual router from multiple physical routers to provide redundancy and failover for a network's default gateway, Virtual IP (VIP) - IP address that is not tied to a specific physical network interface, Subinterfaces - is a virtual interface created by dividing a single physical interface into multiple logical interfaces., Dynamic routing  - a networking technique where routers automatically learn and update the best paths for data to travel without manual intervention by a network administrator. It uses routing protocols to exchange information, allowing routers to adapt to changes like network congestion or link failures by rerouting traffic,

2.1 routing technologies

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