Which of the following is true about the ISIS GR description?

ICMPv6 has two types: Error Messages and Information Messages.

Intranet users of a certain company use NAT's No-pat method to access the Internet. If all public IP addresses are used, what will happen to intranet users who subsequently go online?

In the MPLS-BGP-VPN environment, if the label is only distributed through BGP or LDP, the MPLS label of the packet has at most two layers of labels.

Which AS_PATH can the command ip as-path-filter1 permit^12*74$ match?