1. Single Point of Failure: NLB is a single point of failure, meaning that if the NLB cluster fails, the entire service will be unavailable. For example, if the NLB cluster is down due to a power outage, the entire application or service will be unavailable.
2. Limited Scalability: NLB has limited scalability, meaning that it can only scale up to a certain number of nodes. For example, if the NLB cluster has to support a large number of requests, it may not be able to handle the load and will need to be scaled up.
3. Security: NLB does not provide any security features, meaning that the application or service is vulnerable to attacks. For example, if the NLB cluster is not protected, it can be targeted by attackers and the service can be disrupted.
4. Complex Configuration: NLB requires complex configuration and setup, meaning that it can be difficult to set up and manage. For example, configuring the NLB cluster requires a deep understanding of networking and server administration.