Cisco Certified Network Professional Practice Test 2025 – Your All-in-One Guide to Exam Success!

The default mode for Gateway Load Balancing Protocol (GLBP) is Round-Robin. In this mode, GLBP utilizes a method of balancing outgoing traffic across multiple gateways by distributing traffic evenly among them in a rotating fashion. Each packet sent out from a client will use a different gateway, thus providing a simple yet effective means of load distribution without necessitating any further configuration.

This approach not only improves the utilization of network resources but also enhances redundancy. If one gateway becomes unavailable, the remaining gateways will still participate in the load balancing process. Round-Robin thus provides a straightforward and effective solution that is typically sufficient for many network environments, making it the default choice when GLBP is enabled.

The other modes, such as Host Dependent, Weighted Distribution, and Interface Weighing, offer more complex methods of load balancing that take into account specific traffic patterns or capacities of the gateways involved. However, they require additional configuration and understanding of the network scenario, which is why Round-Robin is favored as a default mode for simplicity and straightforward implementation in typical use cases.