[多选] Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？（）

A . Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot.
B . UDLD protects against STP failures caused by cabling problems that create one-way links.
C . Loop guard detects and protects against duplicate packets being received and transmitted on different ports.
D . UDLD protects against unidirectional cabling problems on copper and fiber media.
E . Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.

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[多选] Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？（）

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