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300-410 Practice Question: Which TWO statements correctly describe the…
Which TWO statements correctly describe the behavior of BGP conditional route injection? (Choose TWO.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The condition for injection is defined by an exist-map, which must match a less specific prefix in the BGP table.
BGP conditional route injection allows a router to inject a more specific prefix into BGP when a condition (the existence of a less specific prefix) is met. The injected route is sourced from a route-map that defines the inject-map, and the condition is checked via an exist-map. The injected route is not automatically redistributed into other protocols unless explicitly configured. The 'show ip bgp neighbors' command does not display injection statistics; instead, 'show ip bgp injected-paths' is used. The injected prefix must be in the BGP table of the injecting router, but not necessarily learned from the neighbor specified in the inject-map.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The injected route is automatically redistributed into connected and static routes.
Why it's wrong here
Incorrect. The injected route is only injected into the BGP table; redistribution into other protocols requires separate configuration.
- ✓
The condition for injection is defined by an exist-map, which must match a less specific prefix in the BGP table.
Why this is correct
Correct. The exist-map specifies the condition prefix that must be present for injection to occur.
- ✓
The inject-map specifies the more specific prefix to be injected along with optional attributes.
Why this is correct
Correct. The inject-map defines the prefix to be injected and can set attributes like next-hop and community.
- ✗
The 'show ip bgp neighbors' command displays the number of injected prefixes per neighbor.
Why it's wrong here
Incorrect. 'show ip bgp neighbors' does not show injection statistics; use 'show ip bgp injected-paths' instead.
- ✗
The injected prefix must be learned from the neighbor specified in the inject-map.
Why it's wrong here
Incorrect. The injected prefix must be in the BGP table of the injecting router, but it can be learned from any source or be locally originated.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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