There is one major difference between an open DNS and a closed DNS. Open DNSs allow multiple users to connect easily while closed ones do not allow more users.
there is no difference. they are both 42.
Shoes are closed in and Sandals are open.
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Public is open, private is closed.
Open populations allow for movement of individuals in and out, leading to changes in population size and composition over time. Closed populations have no movement of individuals in or out, maintaining a constant population size and composition.
Gutters are normally open Sewer piping is closed
Pressure rises in the tube.
an inlet has a closed end a straight is open both ends
The answer is in the question itself. Open-source software has it's source code available to everyone. Closed-source software does not.
The difference between an open and closed tender is located on the range of the bidders. Open tenders allow any supplier to bid for your business and also can be useful in establishing the average cost of systems and standard inclusions/ exclusions which closed tender invites select suppliers who have been identified meet or close to your requirements.
Most community colleges are open.