Cisco Certified Network Associate (CCNA) Practice Exam

What is the minimum speed of a Trunk link in Mbps?

1. 10 Mbps

2. 100 Mbps

3. 1 Gbps

4. 1000 Mbps

The correct answer is: 100 Mbps

A trunk link in networking is utilized to carry multiple VLANs (Virtual Local Area Networks) across a network connection. The minimum speed of a trunk link is essential to ensure efficient data transfer between switches and devices. Typically, trunk links are established using Fast Ethernet, which operates at a minimum speed of 100 Mbps. This speed is critical as it allows for the handling of multiple VLAN traffic simultaneously without significant bottlenecking that could occur with lower-speed connections. Using a 100 Mbps trunk link provides enough bandwidth for a variety of network applications and is suitable for many small to medium-sized networks. Higher speeds, such as Gigabit Ethernet (1 Gbps), are often used for increased performance, especially in larger setups, but they are not a requirement for establishing a trunk link. Therefore, 100 Mbps as a minimum ensures that the link can function effectively for VLAN related traffic even in environments where higher speeds may not be necessary.