Which option describes a difference between EIGRP for IPv4 and IPv6?

Question:
Which option describes a difference between EIGRP for IPv4 and IPv6?

• Only EIGRP for IPv6 advertises all connected networks.
• Only EIGRP for IPv6 requires a router ID to be configured under the routing process
• As numbers are configure in EIGRP but not in EIGRPv3.
• Only EIGRP for IPv6 is enabled in the global configuration mode.

Explanation: To configure EIGRP for IPv6 we must explicitly specify a router ID before it can start running. For example:

ipv6 router eigrp 1 
eigrp router-id 2.2.2.2 
no shutdown

EIGRPv3 also uses the AS number (for example: ipv6 eigrp 1 under interface mode).Notice that EIGRP for IPv6 router-id must be an IPv4 address. EIGRP for IPv4 can automatically pick-up an IPv4 to use as its EIGRP router-id with this rule:

+ The highest IP address assigned to a loopback interface is selected as the router ID.

+ If there are not any loopback addresses configured, the highest IP address assigned to any other active interface is chosen as the router ID

Exam with this question: CCNA v3.0 (200-125) Study Guide – Exam Dumps