300-320 · Question #263
Which two features can you implement to control which networks are advertised by a BGP router? (Choose two.)
The correct answer is A. prefix lists B. route maps. BGP route advertisement can be controlled using prefix lists to filter networks by prefix/mask and route maps to match and manipulate routing policy.
Question
Which two features can you implement to control which networks are advertised by a BGP router? (Choose two.)
Options
- Aprefix lists
- Broute maps
- Cpolicy maps
- Drouter SNMP statements
- Ecrypto maps
How the community answered
(52 responses)- A88% (46)
- C4% (2)
- D2% (1)
- E6% (3)
Why each option
BGP route advertisement can be controlled using prefix lists to filter networks by prefix/mask and route maps to match and manipulate routing policy.
Prefix lists filter BGP advertised or received routes by matching specific network prefixes and prefix lengths, providing granular control over which networks are advertised.
Route maps can match on prefix lists, AS paths, or communities and then permit or deny BGP route advertisements, allowing complex conditional filtering and attribute manipulation.
Policy maps are a QoS tool used for classifying and marking traffic, not for controlling BGP route advertisements.
SNMP statements configure network monitoring and management traps, and have no function in BGP route filtering.
Crypto maps are used to define IPsec VPN parameters and have no role in controlling BGP route advertisements.
Concept tested: BGP route advertisement filtering with prefix lists and route maps
Source: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13754-10.html
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