For the description of URPF technology, which of the following options are correct? (multiple choice)
- The main function is to prevent network attacks based on source address spoofing.
- In strict mode, it does not check whether the interface matches. As long as there is a route to the source address, the message can pass.
- The loose mode not only requires corresponding entries in the forwarding table, but also requires that the interface must match to pass the URPF check.
- Use URPF's loose mode in an environment where routing symmetry cannot be guaranteed.
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