The delay characteristics for the segments including the pro

The delay characteristics for the segments (including the processing at the switches are as follows for cach GigE segment 100 mu s; for the PoS OC - 48 segment between routers 1 ms; for each FE segment 200 mu s; and for the security firewall 5 ms. The interfaces on the firewall are Fast Ethernet. What is the end-to-end delay in the direction from PC to server a) Before the security firewall b) After the security firewall added

Solution

a) Delay when no firewal is included

2*GigE +PoS/OC-48+GigE+FE = 2*100+ 1ms(1000)+100+200 micro sec = 1500micro Sec = 1.5ms

b) Delay when firewal is included

2*GigE+PoS/OC + GigE+SecurityFirewall+3*FE = 2*100+1ms(1000)+5ms(5000)+100+3*200 = 200+1000+5000+100+600=6800micro sec = 6.8ms