350-401 Question 154
Select 3A network engineer is tasked with implementing policy-based routing (PBR) to ensure traffic from a specific subnet (192.168.10.0/24) is routed through a secondary WAN link instead of the default route. Which of the following components are required to successfully configure policy-based routing?
- A
Access control list (ACL) to match traffic
- B
Route-map to define the PBR policy
- C
Static route to the secondary WAN link
- D
PBR applied to the correct interface
- E
Redistribution of PBR policies into the routing protocol
Show answer and explanation
Correct answers: A, B, D
Explanation
Policy-based routing allows administrators to override the default routing behavior by defining specific policies for traffic forwarding. To configure PBR, an ACL is used to identify the traffic, a route-map specifies the policy actions, and the policy is applied to the appropriate interface. Static routes and routing protocol redistribution are not inherently part of PBR configuration.
- A. Correct.
An access control list (ACL) is required to match the specific traffic that will be subject to policy-based routing.
- B. Correct.
A route-map is necessary to define the PBR policy, including the conditions and actions to take for matched traffic.
- C. Incorrect.
A static route is not mandatory for PBR. PBR can redirect traffic to a next-hop IP or outbound interface without requiring a static route.
- D. Correct.
PBR must be applied to the correct interface (usually inbound) for it to take effect and impact the specified traffic.
- E. Incorrect.
Redistribution of PBR policies into the routing protocol is not required, as PBR operates independently of the routing protocol and does not modify the routing table.