Patient with head and neck cancer with contralateral Lymphnode of 3 cm size. Nstaging

N0 No nodal metastasis     N1 Single Ipsilateral Equal to or <3 cm N2a Single Ipsilateral 3 to 6 cm N2b Multiple Ipsilateral None > 6 cm N2c Single or Multiple Bilateral or Contralateral None > 6 cm N3 Single or Multiple Ipsilateral, Bilateral or Contralateral Any node >6 cm