mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Examine the following configuration on a PE…
Examine the following configuration on a PE router:
ip vrf CUSTOMER-E
rd 400:1 route-target export 400:1 route-target import 400:2 !
interface GigabitEthernet0/5 ip vrf forwarding CUSTOMER-E ip address 10.4.4.1 255.255.255.252
!
router bgp 65000 neighbor 10.0.0.1 remote-as 65000 neighbor 10.0.0.1 update-source Loopback0
! address-family vpnv4
neighbor 10.0.0.1 activate neighbor 10.0.0.1 send-community extended
exit-address-family ! address-family ipv4 vrf CUSTOMER-E
neighbor 10.4.4.2 remote-as 65003 neighbor 10.4.4.2 activate neighbor 10.4.4.2 route-map SET-COMMUNITY in
exit-address-family ! route-map SET-COMMUNITY permit 10 set community 100:100
What is the effect of the route-map on the incoming routes from the CE?
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
✓
The route-map will set the standard community 100:100 on the routes received from the CE, but the RT is still determined by the route-target export command.
The route-map is applied inbound on the eBGP session from the CE. It sets a standard community on the routes. However, for MPLS L3VPN, the extended community (route-target) is what matters for VRF import/export. The standard community set here does not affect the RT. The route-map will modify the standard community attribute, but the RT is still set by the route-target export command. The route-map does not interfere with the VPNv4 process.
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 route-map will set the standard community 100:100 on the routes received from the CE, but the RT is still determined by the route-target export command.
Why this is correct
The route-map modifies the standard community, which is a different attribute. The RT is set by the VRF configuration and is not affected by this route-map.
- ✗
The route-map will override the route-target export and set the RT to 100:100.
Why it's wrong here
Route-maps cannot change the RT; RT is set by the route-target export command under the VRF.
- ✗
The route-map will cause the BGP session to reset because the community format is incorrect.
Why it's wrong here
The community format 100:100 is valid.
- ✗
The route-map will have no effect because the community is not sent to the CE.
Why it's wrong here
The route-map is applied inbound, so it modifies attributes on routes received from the CE. The community is set locally.
Go deeper
Related to this question
Learn chapter
OSPF Neighbor Adjacency and Basics
Key term
MP-BGP for VPN
MP-BGP for VPN is an extension of the Border Gateway Protocol that carries multiple types of network layer information to enable scalable, isolated virtual private networks over a shared provider infrastructure.
Key term
LDP Protocol
LDP, or Label Distribution Protocol, is a protocol that routers use to automatically exchange labels that enable MPLS (Multiprotocol Label Switching) to create fast, efficient paths for data packets across a network.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.