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What topics we should study in network security in computer networks?? can someone please tell the topics clearly??

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Network security: 
authentication ---   Kurose & Ross chapter   7.3                
                  / Andrew S Tanenbaum  chapter -  8.7 

** basics of public key and private key cryptography ---  Kurose & Ross chapter     ( Asymetric key cryptography)   7.2      / Andrew S Tanenbaum  chapter - 8.3

digital signatures and certificates ---   Kurose & Ross chapter     7.5       / Andrew S Tanenbaum  chapter -  8.4.2 , 8.5.1 

 firewalls ---    Kurose & Ross chapter   8.5      /   Andrew S Tanenbaum  chapter - 8.6.2 

Source: See comments above.

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* Cryptography
* Public Key Cryptography(RSA algorithm)
* Secured Management(Security Services, Digital Signature, User Authentication using Asymmetric key)
* Key Management(Diffie Hellman Protocol)
* Application Layer Security
* Firewalls

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