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An autonomous system has 7 routers configured with BGP. How many iBGP sessions are required for a fully meshed configuration?
Suggested Answer: C
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26 comments · newest first
DE
Denna
11 months ago
Definitely 21, it's a standard formula.
JA
Janae
11 months ago
I thought it was way more than that!
VE
Veronica
11 months ago
Wait, how does that even work?
PE
Peggie
11 months ago
Totally agree, it's 21!
GE
Gerald
12 months ago
You need 21 iBGP sessions for 7 routers.
IV
Ivette
12 months ago
I remember calculating this before, and I think it’s definitely more than 7. I’m leaning towards 21 sessions based on that formula.
GL
Glory
1 year ago
I’m a bit confused; I thought it was just the number of routers, so maybe it’s 7? But that doesn’t seem right.
OR
Oretha
1 year ago
I recall practicing a similar question, and I think the answer was related to combinations of routers. Could it be 21 sessions?
CE
Celia
1 year ago
I think for iBGP sessions, we need to remember the formula n(n-1)/2, but I'm not entirely sure how to apply it here.
MI
Miesha
1 year ago
I've got this! The formula for the number of iBGP sessions in a fully meshed configuration is n(n-1)/2, where n is the number of routers. So for 7 routers, the answer is 21.
DU
Dulce
1 year ago
I'm a bit unsure about this one. The number of iBGP sessions seems to depend on the number of routers, but I'm not sure of the exact formula.
AR
Artie
1 year ago
Okay, let's think this through step-by-step. If there are 7 routers, that means we need to calculate the number of iBGP sessions required for a fully meshed configuration.
EL
Elena
1 year ago
Hmm, this looks like a classic BGP topology question. I think I know how to approach this, but let me double-check my work.
MA
Marion
2 years ago
But for a fully meshed configuration, each router needs to have a session with every other router, so it should be 7 * 6 / 2 = 21. So, I think C) 21 is correct.
CO
Cordie
2 years ago
I disagree, I believe the answer is C) 21.
MA
Marion
2 years ago
I think the answer is B) 13.
WE
Wenona
2 years ago
Let's see, 7 routers... Hmm, I think the answer is B - 13 sessions. Gotta keep that mesh tight, you know?
QU
Quinn
2 years ago
Oh, I see. So the correct answer is D - 42 sessions.
SH
Shalon
2 years ago
Actually, it's C - 21 sessions.
DO
Dominic
2 years ago
No, I believe it's B - 13 sessions.
FA
Fannie
2 years ago
I think the answer is A - 7 sessions.
RO
Rodney
2 years ago
Woah, 42 iBGP sessions? That's a lot of handshakes! I'm gonna go with option C - 21 sessions, seems like the right balance of connectivity and sanity.
KR
Kristeen
2 years ago
Agreed, option C it is.
JE
Jestine
2 years ago
Definitely, 21 sessions strikes a good balance.
SH
Shawna
2 years ago
Yeah, setting up 42 sessions would be a nightmare.
MA
Marquetta
2 years ago
I think 21 is the right answer too, it's the most efficient option.