mediumMultiple Choice
300-410 Practice Question: Router R4 has the following configuration: ```…
Router R4 has the following configuration:
```
interface GigabitEthernet0/5 ip address 10.4.4.4 255.255.255.0 ip policy route-map PBR-DEFAULT
! route-map PBR-DEFAULT permit 10 set ip default next-hop 192.168.3.1 ``` What is the effect of this configuration?
⚠ Common exam trap
300-410 often tests the distinction between `set ip next-hop` (unconditional override) and `set ip default next-hop` (fallback only when no route exists), so candidates who miss the `default` keyword pick 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
✓
All packets received on G0/5 are forwarded to 192.168.3.1 if they do not have a route in the routing table.
The `set ip default next-hop` command in a route-map applies policy-based routing only when the router has no explicit route in the routing table for the destination — it is a fallback, not an override. So packets received on G0/5 that lack a matching route entry are forwarded to 192.168.3.1, while packets with a valid route follow normal destination-based forwarding. Option A describes this conditional fallback behaviour accurately.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
All packets received on G0/5 are forwarded to 192.168.3.1 if they do not have a route in the routing table.
Why this is correct
The `set ip default next-hop` command applies policy routing only to packets lacking a specific routing-table entry, so traffic with no matching route is forwarded to 192.168.3.1. Packets that do have a route follow normal destination-based forwarding, satisfying the default-path constraint in the stem.
- ✗
All packets received on G0/5 are forwarded to 192.168.3.1 regardless of the routing table.
Why it's wrong here
'set ip default next-hop' applies only when the routing table has no explicit route to the destination; traffic with a matching route is forwarded normally. It is tempting because 'set ip next-hop' does override the routing table unconditionally, which is the correct choice when all packets must be redirected regardless of existing routes.
- ✗
The route-map is missing a match statement, so it does nothing.
Why it's wrong here
A route-map permit sequence with no match statement matches all packets by default, so the set action still applies. It is tempting because match statements are common in policy routing, and omitting one would matter if the intent were to filter specific traffic rather than apply a default next-hop to everything.
- ✗
The configuration is invalid because 'set ip default next-hop' requires an ACL.
Why it's wrong here
'set ip default next-hop' is valid without an ACL; the route-map permit sequence alone matches all traffic, and the default keyword only applies when no explicit route exists. It is tempting because policy route-maps commonly pair match statements with set actions, and an ACL is required for 'set ip next-hop' with match criteria.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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.