mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip policy Interface Route-map
GigabitEthernet0/0 PBR-TRACK
R1# show route-map PBR-TRACK
route-map PBR-TRACK, permit, sequence 10 Match clauses:
ip address (access-lists): 170
Set clauses:
ip next-hop verify-availability 10.0.0.2 10 track 2
Policy routing matches: 100 packets, 8000 bytes
R1# show track 2 Track 2 IP SLA 2 reachability
Reachability is Up 2 changes, last change 00:01:30 Latest operation return code: ok
Tracked by:
ROUTE-MAP 0
R1# show ip route 10.0.0.2
Routing entry for 10.0.0.2/32 Known via "eigrp 1", distance 90, metric 28160 Last update from 192.168.1.2 on GigabitEthernet0/1
Based on this output, what is the most likely behavior for packets matching ACL 170?
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
✓
Packets are forwarded to 10.0.0.2.
The route map uses 'ip next-hop verify-availability' with track 2. Track 2 is Up (IP SLA 2 reachability is ok). Therefore, the next-hop 10.0.0.2 is considered available, and packets matching ACL 170 are forwarded to 10.0.0.2.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Packets are forwarded to 10.0.0.2.
Why this is correct
Since track 2 is Up, the next-hop is verified as available and used for policy routing.
- ✗
Packets are forwarded using the routing table because the next-hop is not reachable.
Why it's wrong here
The next-hop is reachable and the track is Up.
- ✗
Packets are dropped because the track object is not configured correctly.
Why it's wrong here
Track 2 is configured and Up.
- ✗
Packets are load-balanced between the next-hop and the routing table.
Why it's wrong here
PBR does not load-balance with the routing table; it uses the next-hop if available.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
IP SLA for Path Control
IP SLA for Path Control is a Cisco technology that uses active network measurements to dynamically influence routing decisions and redirect traffic along a preferred path when network conditions change.
Key term
Policy Based Routing
Policy Based Routing (PBR) is a technology that allows network traffic to be forwarded based on user-defined policies rather than just the destination IP address in the routing table.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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