Click the Exhibit button.
user@R1# show interfaces lo0
unit 0 {
family inet {
address 10.220.1.1/32;
}
family iso {
address 49.0001.0010.0220.0101.00;
}
}
{edit protocols isis}
user@R1# show
interface ge-1/0/1.0 {
level 2 disable;
}
interface ge-1/1/0.0 {
level 1 disable;
}
interface ge-1/1/1.0 {
level 2 disable;
}
interface lo0.0;
user@R7# show interfaces lo0
unit 0 {
family inet {
address 10.220.1.7/32;}
family iso {
address 49.0002.0010.0220.0107.00;
}
}
{edit protocols isis]
user@R7 show
interface ge-1/0/1.0 {
level 2 disable;
}
interface lo0.0
You are trying to establish an IS-IS Level 1 adjacency over ge-1/0/1 between R1 and R7 without impacting the
other IS-IS adjacencies on R1.
Which configuration change would satisfy this requirement?

A.
Disable Level 2 globally on R7.

B.
Change the area on R7 to match R1.

C.
Disable Level 2 globally on R1.

D.
Change the area on R1 to match R7.

Explanation:
Level 1 adjacencies can be formed between routers that share a common area number, while a Level 2
adjacency can be formed between routers that might or might not share an area number.
https://www.juniper.net/techpubs/en_US/junos16.1/topics/example/isis-multi-level.html