The following description of the optional attributes in BGP is correct: (Multiple Choice)
A . In addition to the recognized attributes, each UPDATE message can contain one or more optional attributes, and each BGP Speaker requires support for these optional attributes.
B . Optional attributes are divided into optional transitions and optional non-transitions.
C . The optional transition attribute is that the BGP router can choose whether to carry this attribute in the Update message. If the received router does not recognize this attribute, it can forward it to the neighboring router. The neighbor router may identify and use this attribute.
D . The optional non-transition attribute is that the BGP router can choose whether to carry this attribute in the Update message. If the receiving router does not recognize this attribute, it will discard this attribute and no longer need to forward it to the neighboring router.
Answer: BCD
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