What is Link Aggregation?

• A. The process of combining multiple physical links between two switches into one logical link.
• B. Splitting a single link into multiple virtual links
• C. Replacing cables with fiber
• D. Creating VLANs

Answer: (A)

Link aggregation is the practice of joining several physical network links between two switches so they operate as a single logical link. This creates more usable bandwidth because traffic can flow over multiple cables at once, and it also adds redundancy—if one cable or port fails, the other links keep the connection alive. To make this work, both switches need to be configured for the same port channel or link aggregation group, and a protocol like LACP (Link Aggregation Control Protocol) often negotiates and maintains the group automatically. How traffic is spread across the individual links is determined by a hashing method that looks at things like source and destination MAC addresses or IP ports, helping balance the load across all active links. This concept is why the option describes combining multiple physical connections into one logical path, not splitting a link, replacing cables with fiber, or creating VLANs.