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Refer to the exhibit.
Routers R1 through R4 in the diagram have established IS-IS adjacencies. Router R1 is L1/L2 and is the DIS of its two broadcast interfaces. How many LSPs will it generate?
Suggested Answer: B
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During the IP forwarding process, routers use the routing table to determine the next hop based on the destination IP address. The source IP address is not directly involved in the lookup process for forwarding.
The ARP table is used to map IP addresses to MAC addresses, specifically for resolving the MAC address of the next hop (destination MAC address) for forwarding packets within the local network.
38 comments · newest first
LA
Lacresha
10 months ago
I agree, 3 makes the most sense here.
LA
Laticia
10 months ago
Definitely 2 LSPs, that's how it works!
HE
Heidy
10 months ago
R1 will generate 3 LSPs.
CE
Cecil
11 months ago
Wait, how can it be 5? That seems off.
NO
Norah
11 months ago
I thought it was 4 LSPs, not sure about this.
DA
Daisy
11 months ago
I remember reading that the DIS generates one LSP for each interface, so maybe it's 4 if we count both broadcast interfaces?
LA
Lashon
11 months ago
I feel like it might be 3 LSPs since R1 is both L1 and L2, but I could be mixing it up with another topic.
GE
Gearldine
11 months ago
I think I practiced a similar question where the DIS generated extra LSPs, but I can't recall the exact number.
MA
Mayra
12 months ago
I remember that L1/L2 routers generate one LSP for each level, but I'm not sure if the DIS role affects that count.
MA
Marvel
12 months ago
Okay, I think I've got it. R1 is the DIS, so it's generating 1 LSP per broadcast interface. And since it's L1/L2, it's generating 1 LSP per level, per interface. That's 2 LSPs per interface, so a total of 4 LSPs. I'm feeling good about this one!
SE
Selma
1 year ago
Ugh, this question is tripping me up. I know R1 is the DIS, but I'm not sure how that affects the number of LSPs it generates. And I'm not totally clear on how the L1/L2 designation comes into play here. I'm going to have to review my IS-IS notes again before I can feel confident about this.
MI
Mitzie
1 year ago
I've got this! R1 is the DIS, so it's generating LSPs for its two broadcast interfaces. And since it's L1/L2, it's generating LSPs for both levels. That means it's generating 4 LSPs total.
DA
Dahlia
1 year ago
Okay, I'm a little confused here. If R1 is L1/L2, does that mean it's generating LSPs for both levels? And if it has two broadcast interfaces, does that mean it's generating 2 LSPs per level? I'm not sure, I'll have to think this through more carefully.
AN
Annice
1 year ago
Hmm, let me think about this. Since R1 is the DIS on its two broadcast interfaces, it should be generating LSPs for each of those interfaces, so I'm going to go with 2.
RE
Refugia
1 year ago
Alright, let's think this through step-by-step. R1 has 2 broadcast interfaces, so that's 2 LSPs. Plus the database summary, so 3 LSPs. And since it's the DIS, one more for that. 4 LSPs, got it!
RO
Roxanne
1 year ago
User 3: Correct, it will generate 4 LSPs.
VA
Vallie
1 year ago
User 2: 4
TA
Talia
1 year ago
User 1: So, how many LSPs will R1 generate?
VA
Vannessa
2 years ago
Haha, I bet the test writer is an IS-IS fanatic. Who else would come up with a question like this?
TE
Tequila
1 year ago
Let's go with option B then, 3 LSPs.
WI
Willard
1 year ago
I agree, R1 will generate 3 LSPs.
MY
Myong
1 year ago
I think the answer is 3, what do you think?
MO
Mona
1 year ago
I know right, this question is definitely for the IS-IS experts.
SH
Sharita
2 years ago
This is a trick question! The answer is 5, because R1 is also the DIS, so it will generate an additional LSP for the DIS.
MA
Margarett
1 year ago
No, it's actually D) 5 because R1 will generate an additional LSP for being the DIS.
MA
Margarett
1 year ago
A) 2
CO
Corinne
2 years ago
That makes sense, I see your point now. Thanks for explaining.
LU
Luisa
2 years ago
If R1 is L1/L2, it should generate 4 LSPs - one for each of its interfaces plus one for the database summary.
DO
Dong
1 year ago
D) 5
AR
Aracelis
1 year ago
C) 4
JE
Jesusita
1 year ago
B) 3
JA
Jacquelyne
1 year ago
A) 2
GA
Gayla
1 year ago
D) 5
GL
Glynda
1 year ago
C) 4
PA
Paola
1 year ago
B) 3
OC
Octavio
2 years ago
A) 2
JO
Johnson
2 years ago
I disagree, I believe the answer is C) 4 because R1 is the DIS of its two broadcast interfaces.
CO
Corinne
2 years ago
I think the answer is A) 2.