After executing the displaospf interface command on the MSR router RTA, the router output is as follows:

From the above output it can be judged that ______.

When the area authentication and domain authentication are configured in IS-IS, the IS-IS message types that are authenticated include _________.

The advantages of DR/BDR election in OSPF protocol include ______.

As shown in the picture, PC1 and RTA establish connection through ISATAP tunnel, RTA and RTB establish 6to4 tunnel, all configurations are correct. If PC1 obtains the IPv6 address correctly, then send out the message whose destination address is PC2 (2002:201:2:2009::2). Then the IPv4 destination address encapsulated in the message sent from PC1 is ______; and the IPv4 source address encapsulated in the message sent from RTA is ______.

The BGP protocol is carried by _________, and its port number is _________