What are two problems caused by a large number of ARP request and reply messages?

A large number of ARP (Address Resolution Protocol) requests and replies can lead to significant issues in a network. One of the primary problems is that it can flood the subnet with excessive broadcasts. Since ARP operates through broadcast messages, excessive requests can overwhelm the network and lead to congestion, making it difficult for devices to communicate effectively.

Additionally, this flooding can slow down the switching process. Switches, while designed to handle a certain amount of traffic efficiently, can become bogged down when they are inundated with numerous ARP messages. This can lead to increased latency for legitimate traffic, as the devices on the network spend precious resources processing these ARP broadcasts rather than forwarding user data.

Therefore, both the slowing of the switching process and the flooding of the subnet with excessive broadcasts are accurate problems caused by a high volume of ARP messages, making the combination of these two impacts the correct choice in this scenario.