Referring to the exhibit, which two configuration changes must you apply for packets to reach from R1 to R3 using IS-IS? (Choose two.)
Referring to the exhibit, which two configuration changes must you apply for packets to reach from R1 to R3 using IS-IS? (Choose two.)
For packets to reach from R1 to R3 using IS-IS, you need to ensure that the correct IS-IS levels are enabled on the interfaces. On R1, you should enable Level 1 on the ge-0/0/1 interface because R1 must participate in Level 1 routing for intra-area communication. On R3, enable Level 1 on the ge-0/0/4 interface so that it can also participate in Level 1 routing. This enables R1 and R3 to communicate within the same IS-IS area.
Looks like the right answer based on https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/example/routing-protocol-is-is-security-configuring-cli.html
Right answer in IS-IS, routing between areas is organized hierarchically. This organization is accomplished by configuring Level 1 and Level 2 intermediate systems. Level 1 systems route within an area. When the destination is outside an area, Level 1 systems route toward a Level 2 system. Level 2 intermediate systems route between areas and toward other ASs. No IS-IS area functions strictly as a backbone. https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/concept/isis-levels-understanding.html
A,D are correct