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Which routing protocol classification should you use when full topology information is needed?
Correct Answer: A
Explanation/Reference: ink-State Routing protocols are routing protocols whose algorithms calculate the best paths to networks differently than Distance Vector routing protocols. Whereas Distance Vector protocols know routes by measures of distance and vector(direction) as reported by neighboring routers, Link-State routing protocols calculate their network routes by building a complete topology of the entire network area and then calculating the best path from this topology or map of all the interconnected networks. Link-State Advantages Faster Convergence - Unlike Distance Vector routing protocols which run algorithm calculations before sending updates, Link-State routing protocols send link-state updates to all routers in the network before running route calculations Triggered Updates - Unlike Distance Vector routing protocols (except EIGRP) which send periodic updates at regular intervals, Link-State routing protocols send LSPs during router startup (flooding) and when a link changes states like going up or down. If their are no changes in the network the protocol only sends hello packets to maintain adjacencies. Scalability - Link-State routing protocols support the ability to configure multiple routing "areas" which allows an administrator to segment a routing protocol processes to defined areas which supports the expansion and troubleshooting of much larger networks. Link-State Disadvantages Greater Processing Requirements - Link-State routing protocols typically demand greater processing power and memory resources from the router. Greater Administrator Knowledge - Link-State routing protocols can demand advanced administrator knowledge to configure and troubleshoot the network area