JN0-130單項選擇題每日一練(2019.01.22)

The output of the show aaa domain-map displays the following information:
Domain: isp1.com; virtual-router: vr1; loopback: 1
Domain: isp2.com; virtual-router: vr2; loopback: 1
Domain: none; virtual-router: vr3; loopback: 1
Domain: default; virtual-router: vr4; loopback: 1
The end user supplies a login name of joe@isp7.com .
Which virtual router is responsible for authenticating this user?（）

An OSPF non-backbone area allows external routes to be flooded within the area. These external routes are propagated into the backbone. However, external routes from other areas are not allowed to enter this area.
Which type of OSPF area does this describe?（）