mediumMultiple Choice
350-401 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip route 10.1.1.0
Routing entry for 10.1.1.0/24 Known via "bgp 65001", distance 200, metric 0 Tag 65002, type external Last update from 192.168.1.2 00:00:15 ago Routing Descriptor Blocks:
* 192.168.1.2, from 192.168.1.2, 00:00:15 ago
Route metric is 0, traffic share count is 1 AS Hops 1 Route tag 65002 MPLS label: 18
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the misconception that MPLS labels only appear in the CEF table or MPLS forwarding table, but they can also be displayed in the routing table when MPLS forwarding is active, leading candidates to incorrectly dismiss option B.
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 is learned via BGP and has an MPLS label assigned, indicating MPLS forwarding.
The output shows the route is known via BGP (AS 65001) with a distance of 200, which is the administrative distance for external BGP routes. The presence of an MPLS label (18) in the routing table indicates that MPLS forwarding is enabled for this prefix, typically via Label Distribution Protocol (LDP) or BGP label distribution. This confirms that the route is learned via BGP and has an MPLS label assigned, making option B correct.
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 is learned via OSPF and tagged with an MPLS label.
Why it's wrong here
OSPF is an Interior Gateway Protocol (IGP) that builds the IP routing table and does not appear in the BGP table; the output explicitly states 'Known via bgp 65001'. While OSPF routes can receive MPLS labels via LDP, that label is a transport label used for IGP forwarding, not a BGP VPN label. The presence of an MPLS label here does not mean the route was learned by OSPF, so this option misidentifies the routing protocol.
- ✓
The route is learned via BGP and has an MPLS label assigned, indicating MPLS forwarding.
Why this is correct
The command output shows 'Known via bgp 65001' and 'MPLS label: 18', which together confirm that the route was received from a BGP peer in AS 65001 and that an MPLS label has been assigned to the prefix. In BGP labeled unicast or MPLS VPN operation, the label is propagated with the route so that ingress PEs can impose the correct label and forward traffic along the LSP. This is the only option that correctly correlates both the routing protocol source and the MPLS forwarding indicator.
- ✗
The route is a directly connected interface with an MPLS label.
Why it's wrong here
A directly connected interface route would be marked with a 'C' in the IP routing table and would not be seen in a BGP table with AS-path information or remote next-hop details. Although a connected interface can have a local MPLS label if LDP is enabled on that interface, the BGP table entry here clearly references an externally learned prefix with BGP attributes. The phrase 'Known via bgp' directly contradicts the concept of a directly connected network, so this option is incorrect.
- ✗
The route is a static route with an MPLS label.
Why it's wrong here
A static route would be configured manually and displayed with an 'S' in the routing table, not learned through BGP. Static routes do not carry BGP path attributes, and a BGP table entry would never list a static route as its source unless redistribution occurred, which is not the case here. The output's 'Known via bgp 65001' proves the route was learned dynamically through BGP, and the MPLS label is a label binding associated with BGP, not with a manually configured static route.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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