(7 marks) Consider the following IPv4 routing table. ? Next Hop Destination 127.0.0.1 129.96.0.0 129.97.152.0 Mask 255.255.255.255 127.0.0.1 255.255.255.0 129.96.54. 255.255.255.128 129.97.152.1 255.255.255.128 129.97.152.183 0.0,0.0 12997 152123 730 085255.123 12997 052 18 default 129.97.0.1 Identify the next hop for the following IP address destinations: i. 129.96.56.254 ii. 129.97.152.129 iii. 129.128.0.1 iv. 129.97.152.1 v. 129.96.0.178 A city of size 52 km2 is to be covered by a digital cellular phone network. The spectrum re-use cluster size is 13 cells, and each cell has area 1 km2. Assume that the cells perfectly fit the city size without overlap. If the system bandwidth is 39 MHz, and FDM is used where each user is allocated 25 kHz including guardband, how many users can simultaneously make calls in the system? How many can simultaneously make calls per cell? (5 marks) The GSM system uses TDM to transmit data. Eight users share a TDM frame of duration 4.615 milliseconds (ms), where each user transmits a 148-bit data frame. There is a guard time of 0.030 ms. What is the peak bit rate of the user? (5 marks) (7 marks) Using TCP, suppose the initial window size is 1, and the congestion threshold is 32. Assuming all packets are acknowledged, give an example showing how the window size evolves up to and beyond the threshold. c. (7 marks) Consider the following IPv4 routing table. ? Next Hop Destination 127.0.0.1 129.96.0.0 129.97.152.0 Mask 255.255.255.255 127.0.0.1 255.255.255.0 129.96.54. 255.255.255.128 129.97.152.1 255.255.255.128 129.97.152.183 0.0,0.0 12997 152123 730 085255.123 12997 052 18 default 129.97.0.1 Identify the next hop for the following IP address destinations: i. 129.96.56.254 ii. 129.97.152.129 iii. 129.128.0.1 iv. 129.97.152.1 v. 129.96.0.178 A city of size 52 km2 is to be covered by a digital cellular phone network. The spectrum re-use cluster size is 13 cells, and each cell has area 1 km2. Assume that the cells perfectly fit the city size without overlap. If the system bandwidth is 39 MHz, and FDM is used where each user is allocated 25 kHz including guardband, how many users can simultaneously make calls in the system? How many can simultaneously make calls per cell? (5 marks) The GSM system uses TDM to transmit data. Eight users share a TDM frame of duration 4.615 milliseconds (ms), where each user transmits a 148-bit data frame. There is a guard time of 0.030 ms. What is the peak bit rate of the user? (5 marks) (7 marks) Using TCP, suppose the initial window size is 1, and the congestion threshold is 32. Assuming all packets are acknowledged, give an example showing how the window size evolves up to and beyond the threshold. c