please please answe part a for me i have only 30 minutes

QUESTION 1 [10 Marks) (a) Given the link capacity for a router is 100 Mbps and RTT for a packet is 200 msec. If the TCP flow of packets is 25, calculate the buffering needed for the router. [4 Marks] (b) A datagram of 6000 bytes arrived at a router and must be forwarded to a link with an MTU of 1700 bytes. Suppose that the original datagram is shown in Figure 1. Answer the following questions. length-6000 ID=333 flag-o offset=0 Figure 1 0) Calculate the number of total fragments will be generated. [2 marks] (ii) Draw all IP fragments generated after fragmentation that reflect the requirement of original payload data in the datagram. [4 Marks]