100-150 Question 177
Select 3You are troubleshooting a network issue where a router is failing to forward traffic to a specific destination network. After reviewing the routing table, you notice there is no entry for this destination. Which of the following actions could resolve the issue?
- A
Add a static route to the destination network.
- B
Enable dynamic routing protocols such as OSPF or EIGRP to learn the route automatically.
- C
Check for any access control lists (ACLs) blocking the traffic to the destination.
- D
Increase the router's CPU and memory resources.
- E
Verify and configure a default gateway or default route on the router.
Show answer and explanation
Correct answers: A, B, E
Explanation
When a router lacks a route to a destination, it cannot forward traffic to that destination. This issue can be resolved by either adding a static route, enabling a dynamic routing protocol to learn the route automatically, or configuring a default route to handle unknown destinations. These approaches ensure the router has a path to the destination network.
- A. Correct.
Adding a static route manually can resolve the issue by explicitly defining the path to the destination network.
- B. Correct.
Enabling a dynamic routing protocol allows the router to learn routes to unknown networks automatically, which can resolve the issue.
- C. Incorrect.
While ACLs can block traffic, they do not affect the presence of routes in the routing table. This option is not directly relevant to the problem described.
- D. Incorrect.
Increasing CPU and memory resources on the router may improve performance but will not address the missing route in the routing table.
- E. Correct.
Configuring a default route ensures that packets destined for unknown networks are forwarded to a next-hop router, which can resolve the issue if no specific route exists.