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When using IS-IS in native mode for routing in a dual-stack IPv4/IPv6 environment, which of the following statements is FALSE?
Suggested Answer: C
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In a dual-stack IPv4/IPv6 IS-IS environment, the SPF (Shortest Path First) algorithm is only run once per router for each protocol (IPv4 or IPv6). The topology is shared, but the SPF calculations for IPv4 and IPv6 are separate. This means that the SPF algorithm will run twice (once for IPv4 and once for IPv6) for each L1/L2 router, not four times.
29 comments · newest first
BR
Brendan
11 months ago
D is definitely a risk if the design isn't solid.
HE
Herschel
11 months ago
Wait, four times for SPF? That seems excessive!
AN
Annita
11 months ago
B makes sense, same topology for both protocols.
EL
Elmer
11 months ago
I think C is the false one, sounds off.
EL
Elza
12 months ago
A is true, all links are IPv4 and IPv6 capable.
MA
Maurine
12 months ago
Option D seems plausible since traffic black-holing can happen in complex setups, but I’m not confident about the specifics.
OM
Omer
1 year ago
I feel like I’ve seen a question similar to this before, and it was about the SPF algorithm, so I’m leaning towards option C being false.
AB
Abel
1 year ago
I remember discussing how IS-IS handles both IPv4 and IPv6, so maybe option A is the false one?
ST
Stephane
1 year ago
I think option C sounds a bit off, but I'm not entirely sure why it needs to run four times.
DA
Dan
1 year ago
I remember learning about this in class. I'm pretty sure the correct answer has to do with the number of times the SPF algorithm needs to be run.
LI
Lina
1 year ago
Okay, let me break this down step-by-step. I think the key is understanding how IS-IS calculates the shortest path tree for both IP versions.
SH
Shizue
1 year ago
Hmm, I'm a little unsure about the details of how IS-IS handles dual-stack IPv4/IPv6. I'll need to think this through carefully.
LI
Lino
1 year ago
This question seems pretty straightforward. I'm pretty confident I can figure this out.
BE
Beckie
2 years ago
I think the answer is B because the same topology information is used for both IPv4 and IPv6.
LO
Loren
2 years ago
I'm not sure, but I think the answer is A.
RO
Ronnie
2 years ago
I disagree, I believe the answer is D.
MI
Milly
2 years ago
I got a headache just reading this question. Maybe I should've stuck to IPv4-only networks, where things are much simpler.
EL
Elliot
2 years ago
Woah, this is some next-level stuff! I'm just hoping I don't accidentally end up in an IPv6 black hole during the exam.
CH
Charlena
2 years ago
User 2: Yeah, you definitely don't want to end up in a traffic black hole.
DE
Delmy
2 years ago
User 1: Don't worry, just remember to properly design your network.
JO
Jospeh
2 years ago
Option D sounds the most plausible. Improper design can definitely lead to traffic black-holing in a dual-stack environment.
BA
Barrett
2 years ago
This question is a real brainteaser! I'm not sure if I agree with any of the answer choices. Maybe they're all false?
AN
Anna
2 years ago
User 2: I agree, all links are assumed to be IPv4- and IPv6-capable.
RO
Rosio
2 years ago
User 1: I think option A is true, not false.
JI
Jina
2 years ago
I think option C is false. The SPF algorithm needs to be run only twice, once for IPv4 and once for IPv6.
DE
Deja
2 years ago
C) In a multi-area environment, the SPF algorithm needs to be run four times on each L1/L2 router.
SH
Sherill
2 years ago
B) The same topology information is used to calculate the shortest path tree for both IPv4 and IPv6.
GR
Gracia
2 years ago
A) All links are assumed to be IPv4- and IPv6-capable.
LU
Luis
2 years ago
I think the answer is C.