Which IPv6 multicast address represents the 'All Nodes' group for the entire site (Site-Local scope), rather than just the local link?

A router has a summary aggregate route configured for EIGRP 192.168.0.0/16. What Administrative Distance is assigned to this summary route on the router where it is configured (locally)?

Which EAP (Extensible Authentication Protocol) method requires digital certificates to be installed on BOTH the server and the client for mutual authentication, offering the highest security?

Which component in a software-defined network (SD-Access) serves as the 'Gateway' between the fabric overlay and the external non-fabric network?

You are configuring a 'helper address' on a router interface to forward DHCP requests. A colleague asks if this command forwards any other UDP traffic by default. What is the correct answer?