What is a valid router ID configuration for OSPFv3 in the Junos OS?
A.
set routing-options router-id 2001:1:2::1
B.
set protocols ospf3 router-id fe80:223:2887:ab31::1
C.
set routing-options router-id 224.1.0.1
D.
set protocols ospf3 router-id 10.8.3.9
The protocol specification for OSPFv3 mandates the use of a 32-bit router ID, which is the same value used by OSPFv2.
It should be D
http://www.juniper.net/documentation/en_US/junos15.1/topics/example/ospf-router-id-configuring.html
C is correct
Also, check where router-id can be used:
http://www.juniper.net/documentation/en_US/junos13.2/topics/reference/configuration-statement/router-id-edit-routing-options.html
OSPFv3 Router IDs, Area IDs, and LSA link-state IDs remain at the OSPFv2 IPv4 size of 32 bits.
Configure the OSPF router identifier by entering the [router-id] configuration value.
[edit]
user@host# set routing-options router-id x.x.x.x
router-id address;
Hierarchy Level
[edit logical-systems logical-system-name routing-instances routing-instance-name routing-options],
[edit logical-systems logical-system-name routing-options],
[edit routing-instances routing-instance-name routing-options],
[edit routing-options]x
x
http://www.juniper.net/documentation/en_US/junos15.1/topics/reference/configuration-statement/router-id-edit-routing-options.html
BTW, part of that new 80Q JNCIP-ENT JN0-647 dumps for your reference:
https://drive.google.com/open?id=0B-ob6L_QjGLpejBJUUI1X2NuU3M
Best Regards!