In the BGP MPLS VPN network, which of the following functions need to be supported by the P device ?
When a PPP frame is encapsulated by adding an L2TP header, it will be marked with the correct Tunnel ID and Session ID to identify its tunnel and session attributes.The Tunnel ID ( tunnel identifier ) in the L2TP header is assigned by ____ , and the Session ID ( session identifier ) is assigned by ____ .
Based on SOA network architecture to enterprise IT systems into which of the following levels ? ( Select one or more )
The ZLB ( Zero-Length Bod ) message is a control message with only an L2TP header, and its function is to serve as an explicit response to ensure reliable delivery of the control message.
In the following four cases, LNS does not send ZLB message to LAC as a response: ____ .
