The answer is that incoming TCP packets with destination port 80 on GigabitEthernet0/2 are forwarded out GigabitEthernet0/3, overriding the routing table. This occurs because the PBR set interface command within the route-map CHECK directs the router to bypass its normal routing decision for matched traffic, forcing the specified egress interface regardless of the destination IP address in the routing table. On the Cisco CCNP ENARSI 300-410 exam, this configuration tests your understanding of Policy-Based Routing (PBR) and the distinction between route-map clauses that modify forwarding versus those that set attributes like next-hop. A common trap is assuming the set interface command requires a next-hop IP; in reality, it directly specifies the output interface, which can cause traffic to fail if that interface is down or the destination is not directly connected. Remember the mnemonic "PBR Pushes Packets Past the Routing Table" to recall that set interface forces a specific path.
300-410 Policy-Based Routing (PBR) Practice Question
This 300-410 practice question tests your understanding of policy-based routing (pbr). 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.
Router R2 has the following configuration:
```
interface GigabitEthernet0/2
ip address 10.2.2.2 255.255.255.0
ip policy route-map CHECK
!
route-map CHECK permit 10
match ip address 101
set interface GigabitEthernet0/3
!
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Incoming TCP packets with destination port 80 on G0/2 are forwarded out G0/3, overriding the routing table.
The route-map matches TCP traffic with destination port 80 (HTTP) and sets the output interface to GigabitEthernet0/3. This is applied inbound on GigabitEthernet0/2.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Incoming TCP packets with destination port 80 on G0/2 are forwarded out G0/3, overriding the routing table.
Why this is correct
PBR matches the ACL and sets the output interface, bypassing the routing table.
Related concept
Static NAT maps one inside address to one outside address.
✗
Outgoing TCP packets with source port 80 on G0/2 are forwarded out G0/3.
Why it's wrong here
PBR is applied inbound, and the ACL matches destination port 80, not source.
✗
All TCP traffic is forwarded out G0/3 regardless of port.
Why it's wrong here
The ACL specifically matches port 80, so only HTTP traffic is affected.
✗
The configuration is invalid because 'set interface' cannot be used with a route-map.
Why it's wrong here
'set interface' is a valid PBR action.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
Policy-Based Routing (PBR) — This question tests Policy-Based Routing (PBR) — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Incoming TCP packets with destination port 80 on G0/2 are forwarded out G0/3, overriding the routing table. — The route-map matches TCP traffic with destination port 80 (HTTP) and sets the output interface to GigabitEthernet0/3. This is applied inbound on GigabitEthernet0/2.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which statement about PBR and the 'set interface' command is correct?
medium
A.The 'set interface' command can only be used with point-to-point interfaces.
B.If the specified interface is down, the router uses the routing table.
C.The 'set interface' command requires a next-hop IP address to be specified.
✓ D.The 'set interface' command forces the packet out the specified interface, and if the interface is down, the packet is dropped.
Why D: The 'set interface' command forces the packet out a specific interface, overriding the routing table. If the interface is down, the packet is dropped unless a fallback is configured.
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Question Discussion
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