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As a result ArrayList is slower than LinkedList and the latter is preferred in case you need to perform insert and delete operations in the middle of a collection.LinkedList worked 200 times faster than ArrayList when 0.1 million elements were inserted at the start of the collection.
Thanks for you explanation. I was also sure that Port fast is an optional feature that need to enable by administrator but some friend made me confuse So Please correct if i am wrong ... 1] So Port Fast is optional feature that can enable as per requriment, Not automatically enable when we run RSTP. 2] Port Fast can be used with STP or PVST.