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Which is true?

Created: Sep 3, 2021 14:21:15Latest reply: Sep 16, 2021 14:27:24 420 13 1 0 0
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Which of the following statement is true?

•    A.) ASBR-Summary-LSAs describe the route to an ASBR and are flooded within an AS.
•    B.) ASE-LSAs describe the route to an external AS and are flooded to an external AS.
•    C.) AS-external-LSAs do not belong to any particular OSPF area,

•    D.) The Type-1 external metrics include only the AS external metric.


Exaplanation is highly required.


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chenhui
Admin Created Sep 3, 2021 14:51:53

Hi,
The answer is C.
ASBR-Summary-LSA is the type 4 LSA, and it will flood in all the ASs.
ASE-LSA, I think you mean the AS-external-LSA, it is the type 5 LSA, it floods in all the ASs.
Type 1 external metrics include both the AS external metric and the metric to the ASBR.
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Rumana
Rumana Created Sep 6, 2021 05:52:53 (0) (0)
Thanks for your clarification  
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Y_T_Z
Y_T_Z Admin Created Sep 3, 2021 14:22:41

I guess it is C.
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Rumana
Rumana Created Sep 6, 2021 05:52:23 (0) (0)
 
Hi,
The answer is C.
ASBR-Summary-LSA is the type 4 LSA, and it will flood in all the ASs.
ASE-LSA, I think you mean the AS-external-LSA, it is the type 5 LSA, it floods in all the ASs.
Type 1 external metrics include both the AS external metric and the metric to the ASBR.
View more
  • x
  • convention:

Rumana
Rumana Created Sep 6, 2021 05:52:53 (0) (0)
Thanks for your clarification  
zaheernew
zaheernew MVE Author Created Sep 4, 2021 09:30:26

Hi,

My answer is D and its true because


Type 1 (EI)- This type includes the external cost to the destination as well as the cost (metric) to reach the AS boundary router.

from the following source: https://support.riverbed.com/bin/support/static/n0glmtc5kegfi7htfe7msdsgcb/html/uc6d3bbkbug83sroi75ersdj9i/sc_ug_html/index.html#page/sh_sd/bgp_ospf.html

Please correct me If am I wrong?
@Y_T_Z @chenhui @BAZ


ggggg





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chenhui
chenhui Created Sep 6, 2021 02:18:32 (1) (0)
Yes, the OSPF E1 route includes the external cost as well as the cost to the ASBR. But selection D says 'The Type-1 external metrics include only the AS external metric.', the cost to the ASBR is not included.  
zaheernew
zaheernew Reply chenhui  Created Sep 6, 2021 04:48:17 (0) (0)
So, My answer is wrong?  
chenhui
chenhui Reply zaheernew  Created Sep 6, 2021 05:43:02 (0) (0)
Yes.  
zaheernew
zaheernew Reply chenhui  Created Sep 6, 2021 05:49:20 (0) (0)
thanks dear  
Thanks to both of did good job Which is true?-4120921-1 Which is true?-4120921-2
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zaheernew
zaheernew Created Sep 6, 2021 08:25:21 (1) (0)
 
Great answer
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Rumana
Rumana Created Sep 16, 2021 15:12:13 (0) (0)
 

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