Answer:
maybe select an instrument
It sounds like you are looking for a network. If a node can not find a network to connect to, then it cannot connect.
A hub can be used to connect multiple computers and networks.
Answer:
CASE
Explanation:
Case Structure is a mechanism that allows different executions when there are several distinct possible values for a single variable, and each value requires a different subsequent action depending on the value of the label.
Case structure is also a conditional control structure that appears in most modern programming languages and allows a selection to be made between several sets of program statements.