Why network component need address?

Answer 1

For the same reason that houses and other buildings need a street address: so they can be found, so mail and packages can be delivered, etc.

For the same reason that telephones need a number: so you can select who to call, so the telephone exchange can connect the call correctly, if the person being called has caller ID service so they can tell who is calling, etc.

For the same reason people have names: so they can be identified, etc.