Regarding the characteristics of the routing table, which of the following items is described correctly

Which of the following protocols is a multichannel protocol?

IKE SA is a one-way logical connection, and only one IKE SA needs to be established between two peers.

DES is a stream encryption algorithm, because the cipher capacity is only 56 bits, so it is not enough to deal with the weakness of insufficient security, and later 3DES was proposed.

Social engineering is a means of harm such as deception, harm, etc. through psychological traps such as psychological weaknesses, instinctive reactions, curiosity, trust, and greed of victims ( )