switch config

Hi Experts,

I have a question to my switch config.
This is an cisco access switch C2960X connected with fiber to my main switch.

I have seen, on some switches I miss a command :

ip route 0.0.0.0 0.0.0.0 10.20.30.40

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is it alwys needed ?
When do I need it ?

And what about this command :

ip default-gateway 10.20.30.40

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