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GLM_191985's avatar
GLM_191985
Icon for Cirrus rankCirrus
Apr 08, 2019

dns works on 2 ports ?

dns works on 2 ports? port no is same tcp and udp 53 ? why do we need 2 ports. why we using 2 different protocols tcp and udp  
application delivery
LTM
Stanislas_Piro2's avatar
Stanislas_Piro2
Icon for Cumulonimbus rankCumulonimbus
Apr 08, 2019

Udp port is used to small size answers...

 

most of DNS servers respond to client to open a tcp connection If answer size is more than 512 bytes