CS432 Handouts, Assignments, Mid & Final Term Past Papers - Scholarships | Fellowships

CS432 Handouts, Assignments, Mid & Final Term Past Papers are discussed below. This course on network modelling and simulation is at the very beginning level. You will learn the fundamentals of modelling in the context of computer networks in this course. We will be using the OMNET++ simulator for the simulation portion. You will learn how to operate this simulator and do network analysis using data gathered during simulation.

Network modelling and simulation are frequently used interchangeably. It’s not, in fact! Simulation is the computational re-enactment of rules from a model to mimic the behavior of a real-world system. In contrast, modelling comes before simulations. Combined, they make an iterative technique that simulates systems in the actual world. The logical representation of a model object, system, phenomenon, or process that is complicated. During communications, the network model analytical presentation, mathematical form as a closed or approximate form of a state machine.

CS432 Handouts, Assignments, Mid & Final Term Past Papers

The use of software to simulate behavior on a computer is known as computer simulation. Accuracy to offer visual understanding. Essentially, it serves as a template for a computer programmed. Take into account a one-hop communication situation with two wireless notebooks linked by a WIFI AP. The simulated entities would consist of several instances of wireless computers and their packets, a single instance of a WiFi AP, and an instance of a traffic generator that generates wireless computers and their packets. WiFi AP states (busy or idle) would be included in the system states. Numerous packets are generated by each computer, with each packet having a success or failure rate.

The occurrences would involve the development of wireless computers, packet generation, and wireless AP activity. The events would need to be scheduled using queues. These would include frames (or packets) at the WiFi AP input queue as well as frames (or packets) in the output queue of the wireless computer. Randomization is required to make the simulation engaging, dynamic, and enlightening. These would include unforeseen discoveries of packet lengths, the number of wireless computers, the number of frames per wireless computer, the BER (and PER), and the percentage of dropped packets in the WIFI AP input queue.

Distributing different entities and events is also necessary. The distributions for packet lengths and the number of frames per wireless computer could be uniform, gaussian, etc. The exposed complexity of the system decreases with decreasing number of steps, and vice versa. The faster the management tasks can be completed, the lower the likelihood of trouble. If the switching fabric is n times faster than the input line rates and the maximum queuing delay is (n-1)D.

Assume that all packets are the same length, that n input ports receive n packets at the same time, and that n packets all want to be forwarded to separate output ports. For the (a) memory, (b) bus, and (c) crossbar switching fabrics, what is the maximum packet delay? Subnetting A subnet with the prefix 128.119.40.128/26 is an example. Give an example of a possible IP address for this network.
A subnet’s prefix Let’s say an ISP is the owner of the range of addresses starting with 128.119.40.64/26. Let’s say it wants to divide this block into four subnets, each with the equal number of IP addresses.

Table of Contents

Course Learning Objectives:

This class will be beneficial for

Study fundamental network modelling and simulation ideas.
Clarifying the ideas and gaining a thorough understanding of computer networks
ability to perform analysis and build models for specific network situations
This course’s knowledge will be useful for network research.

The virtual router is set up to be each computer’s default gateway. The virtual router’s MAC address is returned by the active HSRP router when a PC broadcasts an ARP frame to determine its default gateway. The active router also regularly broadcasts the HELLO message. Created to offer a comparatively easy way to support diverse service classes. Queue by default offers FIFO. Must be changed for the priority queuing operation. Packets are categorized and put into various priority queues.

Packets are only scheduled from the top of a queue if no higher priority queues are active. FIFO order is used to arrange packets within each priority queue. If a flag at the end of a frame contains an error, the receiver won’t recognize the end of the frame and won’t check the cyclic redundancy check (CRC). When the next flag is detected, the receiver assumes the CRC is in the place before the flag. This perceived CRC might really be the CRC for the next frame. But the receiver perceives two frames as a single one. The probability that the receiver will miss errors is 2-L, where L is the length of the CRC.

Every frame in DECNET has a fixed-length header. Incorporates frame length in header – Header has its own CRC Limitation: following such a mistake, the transmitter must still resync; the receiver will not know when the next frame begins. Partial Solution 2 – This method avoids the inefficiencies of the DECNET approach but requires a particular synchronizing sequence once each fault is detected. It involves inserting the length field of one frame into the trailer of the prior frame.