350-401 Question 153
Select 3A network administrator is tasked with configuring policy-based routing (PBR) on a router to ensure that traffic from the 192.168.1.0/24 subnet is forwarded to a specific next-hop address (192.168.2.1), regardless of the routing table's default behavior. Which of the following steps are required to implement this configuration?
- A
Define an access control list (ACL) to match traffic from the 192.168.1.0/24 subnet.
- B
Configure a route-map that specifies the next-hop address as 192.168.2.1.
- C
Apply the route-map to the incoming interface using the 'ip policy route-map' command.
- D
Enable Dynamic Routing Protocols (e.g., OSPF) to advertise the 192.168.2.1 route.
- E
Modify the router's default gateway to point to 192.168.2.1.
Show answer and explanation
Correct answers: A, B, C
Explanation
To implement policy-based routing (PBR), administrators must first define an ACL to identify the traffic that PBR will manage. Next, a route-map is created to specify the desired action, such as setting a specific next-hop address. Finally, the route-map must be applied to the relevant interface using the 'ip policy route-map' command. Dynamic routing protocols and default gateway configurations are not necessary for PBR, as PBR operates independently of the routing table's standard behavior.
- A. Correct.
Correct: An ACL is required to identify the traffic that will be subjected to policy-based routing.
- B. Correct.
Correct: A route-map is needed to define the action to be taken (e.g., setting the next-hop address).
- C. Correct.
Correct: The 'ip policy route-map' command is required to apply the route-map to the appropriate interface for PBR to take effect.
- D. Incorrect.
Incorrect: While dynamic routing protocols are useful for route advertisements, they are not required for configuring policy-based routing.
- E. Incorrect.
Incorrect: Modifying the default gateway is unrelated to implementing policy-based routing as it does not provide traffic-specific control.