SR-MPLS is enabled on all routers. The label information encapsulated by R1 into a data packet is shown in the figure. Which of the following MPLS labels is carried in the data packet when it is sent from R2 to R4?
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H12-891 Exam - Question 6
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Correct Answer: B
The MPLS label stack originating from R1 encapsulates the path information through the network. When a packet traverses through intermediary routers, each router swaps the top label with the appropriate label for the next hop. Starting from R1, the packet is labeled with 2013 (R1 to R3), then 2032 (R3 to R2), and then 2024 (R2 to R4). When R2 forwards the packet to R4, it uses the top label 2024 because that’s the next hop label instructed by the label switching mechanism.
Discussion
4 commentsFighter2k
Feb 4, 2024why not B?! 2024
Jevza
Apr 13, 2024B is the correct Answer
6702b63
Jul 26, 2024C, Segment ID 2024 is removed by R2
LucasBueeOption: C
Dec 5, 2024Option C, the label stack is removed hope by hope. When the packet reaches R2 the label stack contains the following labels 2024 and 2046. The label 2024 is removed by R2 and the packet is forward to R4 with label 2046.