IP Address Blocking

I just noticed that my system wasn’t connecting to the internet again but the system was sending and receiving data. I decided to connect to the wireless and i found out it started working. The IP addresses are issued by DHCP so i decided to configure the IP manually and i changed the Ip address and it started working using LAN. Is it possible that my network admin blocked my IP from browsing the internet?
Also how does the network admin monitor traffic?