Which option is a valid IPv6 multicast address?
A.
fe80::205:8640:471:3200/64
B.
::172.16.0.5/126
C.
ff03:365:ba::23
D.
ff01:cgfc:345::226:8ff:fee4:bf6f
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This is confusing. As all of the choices except C are not closely related to a multicast address, we can say C is the answer [A and B don’t have the first 8 bits of 1’s, and D is a wrong IPv6 address as there is no such thing as ‘g’ in hex].
But lets look at C. An IPv6 multicast address has the first 16 bits of format
[8bits of 1’s][4 bits for flags][4 bits for scope ID]
But in C, the scope ID is 3, which is not one of the currently defined scope ID values (defined decimal values are 0,1,2,5,8,14,15).
Any thoughts?
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0
https://www.ietf.org/rfc/rfc7346.txt
+——+————————–+————————-+
| scop | NAME | REFERENCE |
+——+————————–+————————-+
| 0 | Reserved | [RFC4291], RFC 7346 |
| 1 | Interface-Local scope | [RFC4291], RFC 7346 |
| 2 | Link-Local scope | [RFC4291], RFC 7346 |
| 3 | Realm-Local scope | [RFC4291], RFC 7346 |
| 4 | Admin-Local scope | [RFC4291], RFC 7346 |
| 5 | Site-Local scope | [RFC4291], RFC 7346 |
| 6 | Unassigned | |
| 7 | Unassigned | |
| 8 | Organization-Local scope | [RFC4291], RFC 7346 |
| 9 | Unassigned | |
| A | Unassigned | |
| B | Unassigned | |
| C | Unassigned | |
| D | Unassigned | |
| E | Global scope | [RFC4291], RFC 7346 |
| F | Reserved | [RFC4291], RFC 7346 |
+——+————————–+————————-+
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