How to apply canActivate guard on all the routes?

You can introduce a componentless parent route and apply the guard there:

const routes: Routes = [    {path: '', canActivate:[AuthenticationGuard], children: [      { path : '', component: UsersListComponent },      { path : 'add', component : AddComponent},      { path : ':id', component: UserShowComponent },      { path : 'delete/:id', component : DeleteComponent },      { path : 'ban/:id', component : BanComponent },      { path : 'edit/:id', component : EditComponent }    ]}];

You can also subscribe to the router's route changes in your app.component's ngOnInit function and check authentication from there e.g.

    this.router.events.subscribe(event => {        if (event instanceof NavigationStart && !this.token.isLoggedIn()) {            this.router.navigate(['/login'],{ queryParams: { returnUrl: state.url}});         }    });

I prefer this way of doing any kind of app wide check(s) when a route changes.

I think you should implement "child routing" which allow you to have a parent (with a path "admin" for example) and his childs.

Then you can apply a canactivate to the parent which will automatically restrict the access to all his child. For example if I want to access "admin/home" I'll need to go throught "admin" which is protectected by canActivate. You can even define a parent with an empty path "" if you want