mediumMultiple Choice
300-410 Practice Question: Given this partial configuration on router R6:…
Given this partial configuration on router R6:
router bgp 65000 neighbor 192.168.1.1 remote-as 65001
address-family ipv4
network 172.16.0.0 mask 255.255.0.0
aggregate-address 172.16.0.0 255.255.0.0
What is missing if the administrator wants to ensure that only the aggregate route is advertised to neighbor 192.168.1.1?
⚠ Common exam trap
The trap is thinking that removing the network statement or using a route-map is necessary; candidates overlook the built-in 'summary-only' keyword that directly solves the problem.
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 'summary-only' keyword is missing from the aggregate-address command.
The 'aggregate-address' command without the 'summary-only' keyword advertises both the aggregate and the more-specific routes. To advertise only the aggregate, the 'summary-only' keyword must be added. The network statement is needed to inject the component route into BGP.
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 'summary-only' keyword is missing from the aggregate-address command.
Why this is correct
Without the summary-only keyword, the aggregate-address command advertises both the aggregate 172.16.0.0/16 and its more-specific component routes. Adding summary-only suppresses those specifics, leaving only the aggregate sent to neighbour 192.168.1.1, satisfying the requirement that solely the aggregate be advertised.
- ✗
The 'network' command should be removed.
Why it's wrong here
Removing the network command would stop 172.16.0.0/16 being originated, but the aggregate alone would not advertise unless a component route exists in the BGP table. It is tempting because the network statement does inject the prefix, but the actual fix is the summary-only keyword on aggregate-address.
- ✗
The 'synchronization' command must be enabled.
Why it's wrong here
Synchronisation governs whether BGP waits for IGP reachability before advertising routes; it does not suppress more-specific prefixes. It is tempting because it is a genuine BGP configuration command affecting route advertisement, but it would matter in a transit-AS design with an IGP, not for hiding component routes behind an aggregate.
- ✗
The 'neighbor 192.168.1.1 route-map' command is needed.
Why it's wrong here
A route-map filters or modifies advertisements; it does not suppress the more-specific network 172.16.0.0/16 that the network command already injects. It is tempting because route-maps do control what neighbours receive, but the required mechanism here is the aggregate-address summary-only keyword, which suppresses all component routes.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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