NSE7 Advanced Networking and SD-WAN Practice Question
An administrator runs 'get router info routing-table bgp' and sees that a route for 10.20.0.0/16 is learned via BGP from a neighbor. However, the route does not appear in the routing table. The administrator checks the BGP configuration and sees that 'network 10.20.0.0 255.255.0.0' is not configured under BGP. What is the most likely reason?
⚠ Common exam trap
Many exam-takers assume a missing 'network' statement prevents any BGP route from being installed, but the network statement only affects route origination, not the installation of received routes from a neighbor.
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
✓
A route map is filtering the received route
The route for 10.20.0.0/16 is learned via BGP from a neighbor and appears in the BGP table, but it is not installed in the routing table. The most likely reason is that a route map is filtering the received route, preventing it from being installed. Since the network statement is not configured under BGP, the route is not originated locally, but it can still be received from a neighbor; however, an inbound or outbound route map can deny the route from entering the routing table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A route map is filtering the received route
Why this is correct
Even though the route is learned, it may be filtered by an inbound route map before being installed in the routing table.
- ✗
The route is a default route (0.0.0.0/0) and is being suppressed
Why it's wrong here
The route is 10.20.0.0/16, not default. Also, suppression is for advertisement, not for installation.
- ✗
The BGP neighbor is not in the Established state
Why it's wrong here
If the neighbor were not Established, the route would not show as learned. The output confirms it is learned.
- ✗
The route is not in the routing table because BGP requires the network statement to originate the route
Why it's wrong here
The network statement is for originating routes, not for receiving them. The received route should still appear.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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