A network engineer is troubleshooting an unsuccessful PPP multilink connection between two routers. The multilink interface has been created and assigned a number, the interface has been enabled for multilink PPP, and the interface has been assigned a multilink group number that matches the group assigned to the member physical serial interfaces. The physical serial interfaces have also been enabled for PPP multilink. Which additional command should to be issued on the multilink interface?

ip address 192.168.10.1 255.255.255.252

Explanation:

Based on the scenario being described within the question it can be said that the additional command that should be issued would be "ip address 192.168.10.1 255.255.255.252 ". This is because an IP address needs to be assigned to the multi-link interface. Seeing since the physical serial interfaces are designed and programmed to have no IP address as well as  encapsulation ppp, and clock rate commands.

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