In a network accident, it was discovered that a certain host A received a large number of ICMPechorepl messages.The source address of the ICMPechorep was almost all the host addresses in the subnet where the host is located.What kind of attacks might this host have received ?

The following options belong to CPE are

As shown in the figure, when HostA accesses HostB , which device is the most downstream device ?

When a user's private network message is forwarded in the BGP MPLS VPN network, which of the following parameters may appear in the user's private network message ?

An operator hopes to deploy ADSL ( ADSL2 ) to kill the system in a community with relatively dense users and short transmission distance .Users do not require high bandwidth, and pay more attention to its economy and ease of installation and maintenance.
Based on the above requirements, when choosing ADSL ( ADSL2 ) standard, the ideal is ____ .( Choose one or more )