In the process of establishing a PPP session, when the physical layer is unavailable, the PPP link is in the ______ phase.

The DNS domain name server can complete the resolution of domain names to IP addresses, and the server that can provide specific domain name mapping authority information must be ______.

Which of the following routing protocols only cares about the distance and direction to the destination network segment? (multiple choice)

An MSR router is connected to the Internet through the S1/0 interface, and the GE0/0 interface is connected to the LAN host. The network segment of the LAN host is 10.0.0.0/8, and there is an FTP server with an IP address of 202.102.2.1 on the Internet.
By configuring the IP address and routing on the router, the hosts in the current LAN can access the Internet normally (including the public network FTP server). Now the following configuration is added to the router:
firewall enable
acl number 3000
rule 0 deny tcp source 10.1.1.1 0 source-port eq ftp destination 202.102.2.1 0
Then apply this ACL to the inbound and outbound directions of the GE0/0 interface, then which of the following intentions can this ACL achieve?

If a port running STP in the Ethernet switch does not receive or forward data, receives and sends BPDUs, and does not perform address learning, then the port should be in the ______ state.