Information Technology Assignment Example | Topics and Well Written Essays - 1000 words

Information Technology - Assignment Example This mode of operation allows nodes on the wireless network to communicate directly to each other. Infrastructure mode in better compared to the alternative ad-hoc wireless networks because it offers scalability, security management at a central point and improves the reach. While AP devices are seem as the only shortcoming of this infrastructure mode of operation. Question 2 The node does not need to be mobile because the internet through the access point has only one IP address. The node becomes mobile if the IP address and the name changes and this happens in new locations. If the laptop user accesses the internet through the same AP then he/she is still within the same location. Dynamic Host Configuration (DHCP) could be used to solve the mobility of a node where new IP address is acquired in new location. Question 3 a. X(t) will continue to come in order to fill the client buffer, the received TCP buffer will be drained at a rate of d by the client application after the client b uffer has been filled by the incoming buffer from the server buffer. The client will therefore store the received data without playing it back immediately as it receives it this provides a playout delay. The data is played from the buffer allowing the received data to fill the back up of the buffer. The playout delay is increase by accumulating more data in the buffer before playing it. Unusual delay of the playout results to data in the buffer dipping more than usual than the refilled data. Therefore the client buffer evolves with the buffering and playout delays in addition to delays by the network. When considering switching from TCP to UDP sound quality should be a factor because TCP gives better sound quality than UDP. Question 4 a. When a high priority packet arrives during the transmission of a low priority packet, preemptive scheduling occurs. There is an interruption of lower priority packet while higher priority packet is transmitted in full. Preemptive scheduling does not make sense in networks since it wastes a lot of bandwidth given that the lower packet is partially received which does not make sense. In the figure assume that packets 1, 3, and 4 are of higher priority while 2 and 5 are of lower priority the transmission of packets will be interrupted if the higher priority packets arrive before the completion of lower priority packets. In a preemptive priority queuing the packets of higher-priority will be send first before the transmission of lower priority packets hence packets 1,3,4,2 then 5 sequence will be followed. b. Delay play-out is used to compensate delays in the network and the jitters delay in the transmission of the packets. References Alvarez-Cuevas F, Bertran M, Oller F, Selga JM (1993) Voice synchronization in packet switching networks. IEEE Networks Mag 7(5):20–25 Yajnik M, Kurose J, Towsley D: Packet loss correlation in the Mbone multicast network. In: Proceedings of IEEE Global Internet Mini-Conference, Part of GLOBECO M ’96, London, England, pp 94–99 E. Shim and R. Gitlin, â€Å"NeighborCasting: A fast handoff mechanism in wireless IP using neighboring foreign agent information,† presented at the New York Metro Area Networking Workshop, New York,