350-501 Services Practice Question
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?
⚠ Common exam trap
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.
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
✓
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.
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.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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