Cisco Certified Network Associate (CCNA) The Cisco Certified Network Associate (CCNA) certification is the second level of Cisco's five-level career certification process. A CCNA certification certifies a technician's ability to install, set up, configure, troubleshoot and operate a medium-sized routed and switched computer network.
Freebase(0.00 / 0 votes)Rate this definition: Retraining. Vocational rehabilitation or retraining is the process of learning a new skill or trade, often in response to a change in the economic environment. Generally it reflects changes in profession rather than an upward movement in the same field.
A derailleur is often erroneously called a gear shifter, though that is, in fact, what it does. It is part of a bicycleâs drivetrain that moves the bicycle forward; this device moves the bicycle chain across the cogs in order to move it â or shift â to a higher or lower gear. There are two classifications of derailleur: front and rear.