Last Minute Notes – Computer Networks

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1. Class Full Addressing Table

   

2. Flow Control
   N = Sender’s Window Size. (in SR both sender and receiver window are same)
   a = Tp/Tt

   

3. Sequence No. >= (Sender’s Window Size) + (Reciever’s Window Size )
4. Efficiency in TDM(polling) = T_t/(T_poll + T_t+ T_p)
5. In CSMA/CD
   Tt >= 2*Tp
   
   
   

   Hence, min frame length = 2*Tp*B

6. CSMA/CD

   Efficiency = 1/(1 + 6.44a)

7. N = No. of stations
   Early Token Reinsertion : Efficiency = 1/(1 + a/N)
   Delayed Token Reinsertion : Efficiency = 1/(1 + (N+1)a/N)
8. Pure Aloha Efficiency = 18.4 %
   Slotted Aloha Efficiency = 36.8%
9. Layers and there uses

   

10. Difference between DVR and LSR

    

11. In TCP congestion control Algorithm
    When Time Out Occurs Algorithm Enters Slow Start Phase
    When 3 Duplicate occurs algorithm enters congestion avoidance phase
12. Network Security
    For Symmetric Key : n*(n-1)/2 keys are required.
    For Public Key : 2*n key are required ( each node will have private and public key).
    Deffie Hellman Key Exchange
    R1 = g^x mod p
    R2 = g^y mod q
    Both will have same key = g^xy mod p.
    
    
    
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    Computer Networks