Huawei Certified ICT Associate – Data Center Network (HCIA-DCN) — Question 80

Which of the following statements about the "S" field in the MPLS packet header are true? (Choose all that apply.)

Answer options

• A. The field indicates whether there are other labels behind the current label. 1: Yes; 0: No.
• B. The "S' field is 1 bit long in frame mode and 2 bits long in cell mode.
• C. The field indicates whether there are other labels behind the current label. 0: Yes; 1: No.
• D. The "S" field exists in each MPLS packet header.

Correct answer: A, D

Explanation

Option A is correct because the 'S' field indeed indicates whether additional labels are present. Option D is also correct as the 'S' field is found in all MPLS packet headers. Options B and C are incorrect; B misstates the length of the 'S' field in different modes, while C incorrectly reverses the meaning of the field's values.