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Which BGP feature allows BGP routing tables to be refreshed without impacting established BGP sessions?
Correct Answer: B
Explanation/Reference: Explanation: Clearing a BGP session using a hard reset invalidates the cache and results in a negative impact on the operation of networks as the information in the cache becomes unavailable. Soft reset is recommended because it allows routing tables to be reconfigured and activated without clearing the BGP session. Soft reset is done on a per-neighbor basis. Reference: http://www.cisco.com/en/US/products/ps6599/products_data_sheet09186a0080087b3a.html