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Exam 300-410 topic 1 question 382 discussion

Actual exam question from Cisco's 300-410
Question #: 382
Topic #: 1
[All 300-410 Questions]

Which label operations are performed by a label edge router?

  • A. SWAP and POP
  • B. PUSH and POP
  • C. SWAP and PUSH
  • D. PUSH and PHP
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Suggested Answer: B 🗳️
by Titini at Feb. 19, 2023, 12:03 p.m.

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Titini
Highly Voted 2 years, 2 months ago
Selected Answer: B
B. PUSH and POP: A LER pushes a new label onto incoming packets and pops off the label from outgoing packets. The incoming label is used to determine the forwarding path for the packet, while the outgoing label is used to direct the packet to the next hop in the path.
upvoted 6 times
bk989
9 months, 3 weeks ago
Correct. The only way an LER can do PHP9penultimate popping) is if there is LDP/mpls between the PE and CE.
upvoted 1 times
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[Removed]
Most Recent 9 months, 2 weeks ago
Selected Answer: B
B is correct
upvoted 1 times
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[Removed]
9 months, 3 weeks ago
Selected Answer: B
B is correct
upvoted 1 times
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d740f62
1 year, 1 month ago
B Swap for LSR, PHP definitely not for LER.
upvoted 1 times
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KungFuPanda19
1 year, 5 months ago
D. Not sure, though; all semantics here. (ENARSI book p739) Edge router "advertises a pop"; second last router "pops the label".
upvoted 2 times
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KungFuPanda19
1 year, 5 months ago
C. Not sure, though; all semantics here. (ENARSI book p739) Edge router "advertises a pop"; second last router "pops the label".
upvoted 1 times
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inteldarvid
1 year, 9 months ago
Selected Answer: B
yes correct B https://ipcisco.com/lesson/mpls-label-switching/
upvoted 2 times
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