The answer is that the router will set the BGP community to 65001:100 on all routes advertised to neighbor 10.0.0.2. This is correct because the route-map SET_COMMUNITY is applied outbound to the neighbor, and the set community command tags every outgoing route with the specified value before transmission. The BGP community is a well-known transitive attribute used to group routes and enforce routing policies across autonomous systems, making it a powerful tool for traffic engineering. On the ENCOR 350-401 exam, this configuration tests your understanding of how route-maps manipulate BGP path attributes during the update process, often appearing in questions that distinguish between setting communities on outbound versus inbound updates. A common trap is confusing the direction: the route-map is applied out, so it affects routes sent to the neighbor, not routes received from it. Remember the mnemonic "Outbound Tags, Inbound Filters" — outbound route-maps set attributes on advertised routes, while inbound route-maps modify received routes before they enter the BGP table.
350-401 Cisco DNA Center Practice Question
This 350-401 practice question tests your understanding of cisco dna center. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Consider the following BGP configuration on a Cisco IOS-XE router:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The router will set the community to 65001:100 on all routes advertised to neighbor 10.0.0.2.
The route-map is applied to outbound updates to neighbor 10.0.0.2. It sets the BGP community value to 65001:100 on all routes advertised to that neighbor. The community is a well-known transitive attribute that can be used for routing policy.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 router will set the community to 65001:100 on all routes received from neighbor 10.0.0.2.
Why it's wrong here
The route-map is applied outbound, affecting routes sent to the neighbor, not received.
✓
The router will set the community to 65001:100 on all routes advertised to neighbor 10.0.0.2.
Why this is correct
The 'out' direction and route-map cause the community to be set on outbound updates.
The router will filter routes with community 65001:100 from being advertised.
Why it's wrong here
The route-map permits all routes and sets the community; it does not filter.
✗
The router will remove the community from routes advertised to the neighbor.
Why it's wrong here
The community is being set, not removed.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.
Cisco DNA Center — This question tests Cisco DNA Center — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The router will set the community to 65001:100 on all routes advertised to neighbor 10.0.0.2. — The route-map is applied to outbound updates to neighbor 10.0.0.2. It sets the BGP community value to 65001:100 on all routes advertised to that neighbor. The community is a well-known transitive attribute that can be used for routing policy.
What should I do if I get this 350-401 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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