Which of the following types of attacks does DHCP snooping prevent？（Choose all that apply.）（）

• A、Attacker sends multiple DHCP requests flooding DHCP server
• B、Attacker connects rogue server initiating DHCP requests
• C、Attacker connects rogue server replying to DHCP requests
• D、Attacker sends DHCP jam signal causing DHCP server to crash
• E、Attacker sends gratuitous ARP replies， thereby jamming the DHCP server
• F、Attacker sends unsolicited DHCP replies， thereby jamming the DHCP server