350-501 · Question #215
Refer to the exhibit. An engineer configured BGP summarization on a customer's network. Which route is advertised to BGP peers?
The correct answer is B. 192.168.0.0/16. BGP summarization reduces routing table size by aggregating multiple specific routes into a single, broader prefix. The correct summarization choice should encompass the relevant specific routes efficiently.
Question
Refer to the exhibit. An engineer configured BGP summarization on a customer's network. Which route is advertised to BGP peers?
Exhibit
Options
- A192.0.0.0/16
- B192.168.0.0/16
- C192.168.1.0/24
- D192168.0.5/30
How the community answered
(19 responses)- A5% (1)
- B89% (17)
- C5% (1)
Why each option
BGP summarization reduces routing table size by aggregating multiple specific routes into a single, broader prefix. The correct summarization choice should encompass the relevant specific routes efficiently.
192.0.0.0/16 is too broad and would advertise a range of addresses far beyond the typical 192.168.x.x block, potentially leading to incorrect routing for other networks.
A 192.168.0.0/16 prefix correctly summarizes all IP addresses from 192.168.0.0 through 192.168.255.255, providing a common and effective aggregation for networks within this range.
192.168.1.0/24 is a specific network prefix and not a summary route for a larger block of addresses.
192.168.0.5/30 is a highly specific subnet or host route and does not serve as a summary for a broader network range.
Concept tested: BGP route summarization and prefix aggregation
Source: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/200782-BGP-Route-Summarization-Configuration-Exa.html
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