Explanation
https://community.cisco.com/t5/other-network-architecture/out-of-band-router-access/td-p/333295

Explanation
The imp-null (implicit null) tag instructs the upstream router to pop the tag entry off the tag stack before forwarding the packet.
Note: pop means remove the top MPLS label

Explanation

DHCPACK
The server-to-client communication with configuration parameters, including committed network address.
DHCPINFORM
The client-to-server communication, asking for only local configuration parameters that the client already has externally configured as an address.
DHCPNAK
The server-to-client communication, refusing the request for configuration parameter.
DHCPDECLINE
The client-to-server communication, indicating that the network address is already in use

Let's see how the "logging synchronous" command affect the typing command:
Without this command, a message may pop up and you may not know what you typed if that message is too long. When trying to erase (backspace) your command, you realize you are erasing the message instead.

With this command enabled, when a message pops up you will be put to a new line with your typing command which is very