The answer is a route-map that matches the community and sets the local preference to 200, specifically the configuration under route-map SET_LP permit 10 with match community 100 and set local-preference 200. This is correct because BGP local preference is an attribute used to influence outbound traffic from an AS, and setting it via a route-map that matches a specific community allows for granular policy control without altering the community itself. On the Cisco SPCOR / CCNP Service Provider Core 350-501 exam, this question tests your understanding of BGP path manipulation and the distinction between attributes like local preference, weight, MED, and community. A common trap is confusing set community with set local-preference, or mixing up weight (Cisco-proprietary and local to the router) with local preference (propagated within the AS). Remember the mnemonic: "Local Loves Community" — when you match a community, you can set local preference to love that route more.
350-501 Networking Practice Question
This 350-501 practice question tests your understanding of networking. 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.
A router is receiving a BGP prefix with community 100:100. The operator wants to modify the local preference to 200 for this prefix. Which configuration will achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
route-map SET_LP permit 10, match community 100, set local-preference 200
Option D is correct because the 'set local-preference 200' command under a route-map that matches the community will achieve this. Option A is incorrect because the 'set community' modifies community, not local preference. Option B is incorrect because 'set weight' modifies weight. Option C is incorrect because 'set metric' modifies MED.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
route-map SET_LP permit 10, match community 100, set local-preference 200
Why this is correct
Correct. This sets local preference as desired.
Related concept
Standard ACLs match source addresses.
✗
route-map SET_LP permit 10, match ip address prefix-list, set weight 200
Why it's wrong here
Incorrect. This sets weight.
✗
ip bgp-community new-format, route-map SET_LP permit 10, match community 100, set community 200
Why it's wrong here
Incorrect. This sets community, not local preference.
✗
route-map SET_LP permit 10, match community 100, set metric 200
Why it's wrong here
Incorrect. This sets MED.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-501 ACL questions on filtering logic and placement.
Networking — This question tests Networking — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: route-map SET_LP permit 10, match community 100, set local-preference 200 — Option D is correct because the 'set local-preference 200' command under a route-map that matches the community will achieve this. Option A is incorrect because the 'set community' modifies community, not local preference. Option B is incorrect because 'set weight' modifies weight. Option C is incorrect because 'set metric' modifies MED.
What should I do if I get this 350-501 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-501 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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