React-Router 4 catch all route

My React routes are defined as follows:

...
<Route component={Header} />
<Route exact path="/" component={Landing} />
<Route path="/about" component={About} />
<Route path="/contact" component={Contact} />
<Route component={Footer} />
...

I want to define a catch all route that catches anything that does not match the Landing, About or Contact routes, and instead redirects to a 404 Not found page. How can I do it with React Router 4?

Try this implementation

const AppRouter = (props) => {
        return (
            <BrowserRouter>
                <div>
                    <Header />
                    <Switch>
                        <Route exact path="/" component={Landing} />
                        <Route path="/about" component={About} />
                        <Route path="/contact" component={Contact} />
                        <Route component={NotFoundPage} />
                    </Switch>
                    <Footer />
                </div>
            </BrowserRouter>
        );
    }