const routes: Routes = [
  {
    path: '',
    component: Component1,
    pathMatch: 'full'
  },
  {
    path: 'foo/bar',
    component: Component2
  },
  {
    path: 'user/profile',
    component: ProfileComponent
  },
  {
    path: '404',
    component: NotFoundComponent
  },
  {
    path: '**',
    redirectTo: '404',
    pathMatch: 'full'
  }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule],
  providers: []
})
export class RoutingModule {
}

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    ErrorModule,
    HeaderModule,
    HttpModule,
    SharedModule,
    RoutingModule,
    UserModule
  ],
  providers: [
    {
      provide: LOCALE_ID,
      useValue: window.navigator.userLanguage || window.navigator.language
    },
    {provide: RequestOptions, useClass: DefaultRequestOptions},
    {provide: ConnectionBackend, useClass: XHRBackend},
    {provide: Http, useExisting: HttpInterceptor},
  ],
  bootstrap: [AppComponent]
})
export class AppModule {
}

{
    path: '',
    component: Component1,
    pathMatch: 'full'
  },

declarations: [
    AppComponent,
    Component1,
    Component2
    ...
  ]

const routes: Routes = [
  {
    path: '',
    component: HeaderComponent
  },
  {
    path: 'shared',
    component: SharedComponent
  },
  {
    path: '**',
    redirectTo: '404'
  }
];
@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule],
  providers: []
})
export class RoutingModule {
}

@NgModule({
  imports: [
    CommonModule
  ],
  declarations: [SharedComponent]
})
export class SharedModule { }