Refer to the exhibit.
R1
interface gigabitethernet0/0
ip address 192.168.2.1 255.255.255.0
ip router isis
!
router isis
net 49.0022.1111.1111.1111.00
is-type level-1
R2
interface gigabitethernet0/1
ip address 192.168.1.2 255.255.255.0
ip router isis
!
router isis
net 49.0021.1111.1111.1112.00
is-type level-1
Routers R1 and R2 cannot form a neighbor relationship, but the network is otherwise configured correctly and operating normally. Which two statements describe the problem?