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350-501 · Question #204

Refer to the exhibit. An engineer is reviewing the BGP configuration. Which router must be advertised to 10.10.10.1?

The correct answer is D. All routes whether local or from other ASNs are permitted. This question inquires about the BGP advertisement policy to a neighbor with IP address 10.10.10.1, based on a presumed BGP configuration exhibit.

Networking

Question

Refer to the exhibit. An engineer is reviewing the BGP configuration. Which router must be advertised to 10.10.10.1?

Exhibit

350-501 question #204 exhibit

Options

  • ALocal routes are permitted, and routes from other ASNs are denied.
  • BAll routes whether local or from other ASNs are denied.
  • CLocal routes are denied, and routes from other ASNs are permitted.
  • DAll routes whether local or from other ASNs are permitted.

How the community answered

(24 responses)
  • B
    4% (1)
  • C
    4% (1)
  • D
    92% (22)

Why each option

This question inquires about the BGP advertisement policy to a neighbor with IP address 10.10.10.1, based on a presumed BGP configuration exhibit.

ALocal routes are permitted, and routes from other ASNs are denied.

This option describes a specific filtering policy that would require explicit configuration (e.g., using route-maps or filter-lists) to permit local routes and deny external ones, which is not the default BGP behavior.

BAll routes whether local or from other ASNs are denied.

Denying all routes would effectively disable BGP route exchange with the neighbor, which contradicts the fundamental purpose of establishing a BGP peering relationship.

CLocal routes are denied, and routes from other ASNs are permitted.

This option also describes a specific filtering policy that would require explicit configuration to deny local routes and permit external ones, which is not the default BGP advertisement behavior.

DAll routes whether local or from other ASNs are permitted.Correct

In the absence of any explicit outbound filtering rules in the BGP configuration, a router will, by default, advertise all valid and best routes from its BGP routing table to its neighbors, regardless of whether they originated locally or were learned from other ASNs.

Concept tested: Default BGP advertisement behavior

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/15-mt/irs-15-mt-book/irs-basic-bgp.html

Topics

#BGP#Route Filtering#Route Advertisement#Autonomous Systems

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