The answer is that communities 65000:100 and 65000:200 will be attached to the route. This is because the route-map SET_COMM explicitly matches the prefix 172.16.1.0/24 via the prefix-list CUSTOMER, and the set community command within that route-map applies both values simultaneously. When a route-map is applied to a neighbor statement for inbound updates, any matched prefix inherits all communities listed in the set clause, regardless of whether the standard community list is named or inline. On the Cisco SPCOR / CCNP Service Provider Core 350-501 exam, this scenario tests your ability to trace the flow of a BGP community setting route-map, where a common trap is assuming only one community is applied or that the route-map must explicitly reference a community-list to attach values. Remember, the set community command acts like a stamp—it applies every community in the list to the matched route. A useful memory tip: “Match the prefix, set the list—every community in the set will persist.”
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.
Exhibit
Refer to the exhibit.
router bgp 65000
neighbor 10.1.1.1 remote-as 65001
neighbor 10.1.1.1 route-map SET_COMM in
!
route-map SET_COMM permit 10
match ip address prefix-list CUSTOMER
set community 65000:100 65000:200
!
ip prefix-list CUSTOMER seq 5 permit 172.16.0.0/16 le 24
A network engineer applies the above configuration on a PE router. The PE receives route 172.16.1.0/24 from eBGP peer 10.1.1.1. Which communities will be attached to this route?
Refer to the exhibit.
router bgp 65000
neighbor 10.1.1.1 remote-as 65001
neighbor 10.1.1.1 route-map SET_COMM in
!
route-map SET_COMM permit 10
match ip address prefix-list CUSTOMER
set community 65000:100 65000:200
!
ip prefix-list CUSTOMER seq 5 permit 172.16.0.0/16 le 24
A
65000:100 only
Why wrong: Route-map sets two communities, not just one.
B
No communities are attached because the route-map does not specify additive.
Why wrong: Without 'additive', the set community overwrites existing, but no existing were present. The route gets these communities.
C
65000:200 only
Why wrong: Both are set.
D
65000:100 and 65000:200
The set community command can include multiple values.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
65000:100 and 65000:200
The route-map SET_COMM matches prefix 172.16.1.0/24 (permitted by prefix-list CUSTOMER). It sets two communities: 65000:100 and 65000:200. Standard community list includes both.
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.
✗
65000:100 only
Why it's wrong here
Route-map sets two communities, not just one.
✗
No communities are attached because the route-map does not specify additive.
Why it's wrong here
Without 'additive', the set community overwrites existing, but no existing were present. The route gets these communities.
✗
65000:200 only
Why it's wrong here
Both are set.
✓
65000:100 and 65000:200
Why this is correct
The set community command can include multiple values.
Related concept
Standard ACLs match source addresses.
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: 65000:100 and 65000:200 — The route-map SET_COMM matches prefix 172.16.1.0/24 (permitted by prefix-list CUSTOMER). It sets two communities: 65000:100 and 65000:200. Standard community list includes both.
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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