This 350-501 practice question tests your understanding of services. 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
router bgp 65000
neighbor 192.168.1.1 remote-as 64512
address-family ipv4 unicast
neighbor 192.168.1.1 route-map SET_COMMUNITY in
!
route-map SET_COMMUNITY permit 10
match ip address prefix-list MATCH_CUST_A
set community 65000:100 additive
!
route-map SET_COMMUNITY deny 20
!
ip prefix-list MATCH_CUST_A seq 5 permit 10.1.0.0/16 le 24
Refer to the exhibit. A service provider is receiving BGP prefixes from a customer (AS 64512). The provider wants to tag all routes from that customer that match prefix 10.1.0.0/16 or more specific with community 65000:100, while not modifying other routes. After applying the configuration, which statement is true?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Only routes matching 10.1.0.0/16 or more specific will have the community added; other routes remain unchanged.
The configuration uses a route-map applied to the neighbor with a match clause referencing a prefix-list that permits 10.1.0.0/16 le 32. This matches the exact prefix and any more specific prefix (up to /32). The set community 65000:100 action adds the community without using the additive keyword, but because the route-map does not contain a deny clause for non-matching routes, all routes are still accepted; only matching routes have the community added. Thus, only routes matching 10.1.0.0/16 or more specific will have community 65000:100 added, and other routes remain unchanged.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Only routes matching 10.1.0.0/16 or more specific will have the community added; other routes remain unchanged.
Why this is correct
The route-map permits matching routes with additive community, denies others without affecting acceptance.
Related concept
Read the scenario before looking for a memorised answer.
✗
Routes with a mask longer than /24 will be rejected by the prefix-list.
Why it's wrong here
The le 24 allows masks up to /24, not longer.
✗
All routes from the customer will have their communities replaced with 65000:100.
Why it's wrong here
The additive keyword appends, not replaces.
✗
Routes not matching the prefix-list will be denied and not installed.
Why it's wrong here
Deny in route-map does not filter routes; it only skips setting community.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a route-map with a match clause and no explicit deny will reject non-matching routes, when in fact unmatched routes are still permitted and unchanged unless a deny sequence is present.
Trap categories for this question
Keyword trap
The additive keyword appends, not replaces.
Detailed technical explanation
How to think about this question
In BGP, when a route-map is applied to a neighbor without an explicit deny clause, the implicit deny at the end of the route-map does not apply to the neighbor statement — instead, unmatched routes are processed normally (permit with no modifications). The le (less-than-or-equal-to) operator in a prefix-list matches any prefix length from the specified length up to the given maximum; here le 32 means any subnet of 10.1.0.0/16 is matched. The community attribute is a transitive optional attribute (RFC 1997), and without the additive keyword, the set community overwrites any existing community values on the matched prefixes.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Services — This question tests Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Only routes matching 10.1.0.0/16 or more specific will have the community added; other routes remain unchanged. — The configuration uses a route-map applied to the neighbor with a match clause referencing a prefix-list that permits 10.1.0.0/16 le 32. This matches the exact prefix and any more specific prefix (up to /32). The set community 65000:100 action adds the community without using the additive keyword, but because the route-map does not contain a deny clause for non-matching routes, all routes are still accepted; only matching routes have the community added. Thus, only routes matching 10.1.0.0/16 or more specific will have community 65000:100 added, and other routes remain unchanged.
What should I do if I get this 350-501 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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