The client router's interface GigabitEthernet0/0 is connected to the LAN host HostA, and its IP address is 192.168.0.2/24;
The interface Serial6/0 interface is connected to the remote end and is currently operating normally. The ACL configuration is now added as follows:
firewall enable
firewall default permit
acl number 3003
rule 0 permit tcp
rule 5 permit icmp
acl number 2003
rule 0 deny source 192.168.0.0 0.0.0.255
interface GigabitEthernet0/0
firewall packet-filter 3003 inbound
firewall packet-filter 2003 outbound
ip address 192.168.0.1 255.255.255.0
interface Serial6/0
link-protocol ppp
ip address 6.6.6.2 255.255.255.0
Assuming other related configurations are correct, then ______. (Multiple choice)

The following statements about OSPF information display and debugging commands are correct _____. (Multiple choice)

After configuring the relevant configuration of the Telnet service on the router, the router can be pinged from the PC, but the Telnet router fails, and the PC keeps showing that it is connecting to x.x.x.x. The possible reason is ______. (Multiple choice)

On the MSR router, if you want to view the files in the recycle bin, you can use the ______ command.

After the DHCP client receives the DHCP ACK message, if it finds that the IP address it will use already exists on the network, what message will it send to the DHCP server?