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We've had a number of logistical meetings today with the ship 's crew regarding survival at sea , the ship 's communications systems ( including email access ) , and ship and lab safety . Subject matter and methods of presentation varies from semester to semester . The stack behaves as a single unit managed by a master switch elected from one of the member switches . Managing the administrative stuff is important . If the lookup returns that the network does indeed exist out that interface , the packet is forwarded . The stuff is in a primitive state .