e Interview Question

Packets dispatched can be of 3 network types: atm, ieee or Ethernet. The packets have a Boolean flag field which indicates whether the packet is "good" or "bad". The header of the packets is 32 bits in length. When the packet is atm, the entire header is randomly generated, but when it is ieee or Ethernet the lowest 4 bits are always zero. 20% of the time atm packets are generated, while remaining time ieee or Ethernet packets are generated uniformly. Model the above scenario using language e.