A network technician receives reports from users that they are experiencing intermittent internet connectivity. Upon initial investigation, the technician observes that the connectivity issues align with times of high network activity. Which of the following is the MOST likely symptom to investigate further?
Cable interference from external sources
Network congestion due to high activity
Faulty NIC in user devices
Misconfigured DHCP server leasing wrong IP addresses
Outdated firmware on the router causing reboots
Incorrect VLAN assignment on switch ports