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Review the exhibit.
In the exhibit, which action is performed by router R3 for traffic arriving from router R2 towards router R4?
Suggested Answer: C
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In an Ethernet frame carrying a VLAN tag, the VLAN tag appears before the type field. A VLAN tag is a 4-byte field that is inserted into an Ethernet frame to indicate the VLAN membership and priority of the frame. The VLAN tag consists of two subfields: the tag protocol identifier (TPID) and the tag control information (TCI). The TPID subfield is a 16-bit field that identifies the frame as an IEEE 802.1Q-tagged frame, with a value of 0x8100. The TCI subfield is a 16-bit field that contains the priority code point (PCP), the drop eligible indicator (DEI), and the VLAN identifier (VID). The VLAN tag appears between the source MAC address and the type fields of the original frame, shifting the type field by four bytes. The type field indicates the type of the payload, such as IP or ARP .
37 comments · newest first
BI
Billye
10 months ago
Seems like a straightforward pop to me, no doubt about it.
NI
Nickole
11 months ago
I thought PHP was just for web stuff, not routing!
HE
Helaine
11 months ago
Wait, are we sure it's not a swap? That could fit too.
MA
Mable
11 months ago
I agree, pop makes the most sense for this scenario.
HY
Hyman
11 months ago
R3 is definitely doing a pop action here.
LE
Lemuel
12 months ago
I think "PHP" might be the right answer, but I need to double-check what that stands for in this context. It feels familiar from my studies.
JO
Jolene
12 months ago
I’m confused about the terms used here. I vaguely recall "push" and "pop" being related to how data is managed, but I can't remember which one applies here.
SA
Sarah
12 months ago
I practiced a similar question where we had to identify actions in a routing context. I feel like "swap" could be a possibility too.
PA
Pamella
1 year ago
I think R3 might be performing a "pop" action, but I'm not entirely sure. I remember something about how packets are handled in a stack.
LE
Leonor
1 year ago
This is a tricky one. I'm not 100% sure, but I'm leaning towards the PUSH option since that seems to be the most logical MPLS operation for the scenario described. I'll make sure to double-check my understanding before submitting.
MA
Maira
1 year ago
Okay, I think I've got this. Based on the exhibit, it looks like R3 is performing a PUSH operation on the traffic arriving from R2 and destined for R4. That makes sense given the MPLS topology shown.
JU
Julie
1 year ago
I'm a bit confused by the options here. Push, pop, and swap seem like MPLS-related actions, but PHP? That doesn't seem to fit. Let me re-read the question and exhibit closely.
FR
Francesco
1 year ago
Hmm, this looks like a MPLS-related question. I'll need to carefully review the exhibit and think through the MPLS operations that could be performed by the router.
LE
Leota
1 year ago
Ghidra is definitely the right answer here. I've used it before for malware analysis, and it's a powerful tool for reverse engineering. I'm confident in selecting option A.
JI
Jimmie
1 year ago
This question looks pretty straightforward. I think I can work through the cash flows and tax implications to find the right answer.
CA
Catalina
1 year ago
Wait, why are they even asking about MPLS operations? I thought this was a cooking exam. *scratches head* Oh, right, this is an IT certification. My bad, let me think about this swap, pop, push thing again...
RO
Rodrigo
1 year ago
D. PHP, definitely. I mean, who doesn't love a good PHP these days? *laughs* Okay, okay, I'm just kidding. C. Swap is the right answer, I'm sure of it.
HA
Han
1 year ago
D) PHP
SH
Sharee
1 year ago
C) swap
IZ
Izetta
1 year ago
B) pop
BE
Bernardine
1 year ago
A) push
XU
Xuan
1 year ago
Hmm, this is a tricky one. I'm going to go with A. Push, just to be different. Who knows, maybe the exam writers are trying to trick us!
RO
Ronna
1 year ago
User 3: I agree with Ena, B) pop seems like the correct answer.
EN
Ena
1 year ago
User 2: I'm leaning towards C) swap.
FA
Fatima
1 year ago
User 1: I think the answer is B) pop.
LE
Leonora
1 year ago
B. Pop seems like the right choice to me. The label is being removed, so the router must be popping the label off the stack.
RA
Ramonita
1 year ago
Definitely, B) pop is the right choice here. The label is being removed.
VA
Valentin
1 year ago
Yes, I think B) pop is the correct action for router R3 in this scenario.
DA
Daniel
1 year ago
I agree, B) pop makes sense. The label is being removed.
MA
Martina
1 year ago
D) PHP
CH
Chantell
1 year ago
C) swap
KR
Krissy
1 year ago
B) pop
MA
Markus
1 year ago
A) push
GL
Glendora
1 year ago
I think the correct answer is C. Swap. The exhibit shows a MPLS label operation, and swap is the correct action for traffic arriving from R2 and going to R4.
SH
Shawna
1 year ago
I'm not sure, but I think the answer might be D) PHP because router R3 performs the penultimate hop popping in this scenario.
TA
Tamala
1 year ago
I agree with Patrick, because router R3 needs to remove the label before forwarding the traffic to router R4.
PA
Patrick
2 years ago
I think the answer is B) pop.