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Exam 350-501 topic 1 question 113 discussion

Actual exam question from Cisco's 350-501
Question #: 113
Topic #: 1
[All 350-501 Questions]


Refer to the exhibit. An engineer is implementing BGP selective prefix suppression. The router must advertise only 10.16.4.0/24, 10.16.5.0/24, and summarized route 10.16.0.0/21, and suppress 10.16.6.0/24. Which configuration must the engineer apply to the router?

  • A. Router (config)# router bgp 300 Router(config-router)# aggregate-address 10.16.6.0 255.255.252.0 as-set suppress-map SuppressMap
  • B. Router (config)# router bgp 300 Router(config-router)# aggregate-address 10.16.0.0 255.255.255.0 as-set suppress-map unSuppressMap
  • C. Router (config)# router bgp 300 Router(config-router)# aggregate-address 10.16.0.0 255.255.248.0 as-set suppress-map SuppressMap
  • D. Router (config)# router bgp 300 Router(config-router)# aggregate-address 10.16.6.0 255.255.255.0 as-set suppress-map SuppressMap
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Suggested Answer: C 🗳️
by djv0da at Sept. 7, 2022, 11:56 a.m.

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thejag
10 months, 1 week ago
Selected Answer: C
The aggregate-address 10.16.0.0 255.255.248.0 command creates the summary route 10.16.0.0/21 itself but the more specific routers are allowed. So then the suppress-map is used to suppresses the 10.16.6.0/24 route.
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djv0da
1 year, 2 months ago
not D? what am I mising here? "When you use as-set with suppress-map, although the suppressed routes are not advertised, the aggregated route inherits the attributes of all the suppressed routes." https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5441-aggregation.html
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NetworkYoda72
1 year, 2 months ago
Answer D will set the aggregate address summary to 10.16.6.0/24 and not the 10.16.0.0/21 as required in the question. Also this will prevent the 10.16.4 and .5 from inclusion (not supressed) as well.
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