Implementation of EIGRP in BZU Master Thesis By: Kainat Qureshi MIT 09-35 Supervised by: DR. Maruf Pasha Department of Information Technology Bahauddin Zakariya University, Multan Pakistan. Objective: Configuration & Implentation of EIGRP in BZU to improve its existing infrastructure of networking. TABLE OF CONTENTS What is Network ? Network : A network is a set of devices or nodes connected by communication links.A node can be a computer, printer or any other device capable of sending and receiving data generated by other nodes on the network. Most network use distributed processing, in which a task is divided among multiple computers. Network criteria: A network must be able to meet a certain number of criteria, the most important of these are performance, reliability and security. Performance: Performance can be measured in many ways, including transmit time and response time. Transmit time is the amount of time required for a message to travel from one device to another. Response time is a elapsed time between an inquiry and a response. Performance is often evaluated by two networking metrics: throughput and delay.we often need more throughput and less delay. Reliability: Network reliability is measured by the frequency of failure, the time it takes a link to recover from a failure, and network’s robustness in a catastrophe. Security: Network security issues include protecting data from unauthorized access, protecting data from damage, and implementing policies and procedures for recovery from breaches and data losses. Topology There are different types of network topologies, If we are to design a network and we do not know how a network is laid out or how the devices Communicate on that network; it is extremely difficult for us to protect that network. We define physical and logical topology and discuss the various types that exist in each category. Physical Topology : A term physical topology is refers to the way in which network is laid out physically. The topology of a network is geometric representation of the relationship of all the links and linking deices to one another. There are four basic topologies possible. Mesh Star Bus Ring Mesh : In a mesh topology every devices has a dedicated point-to-point link to every other device. The term dedicated means that the link carries traffic only between two devices it connects. The use of dedicated links guarantees that each connection can carry its own data load, thus eliminating the traffic problems than can occur when links must be shared by multiple devices. Advantages: Secure Very complex Extremely fault tolerance Disadvantages: Expensive Difficult to administer Difficult to troubleshoot Difficult to implement Star topology : In stat topology each device has a dedicated point-to-point link only to a central controller, usually called hub. The devices are not directly linked to each other. Unlike mesh topology, a star topology does not allow direct traffic between devices. The controller acts as an exchange: if one device wants to send data to another device, it sends data to the controller, which then relays the data to the other connected device. A star topology is less expensive than a mesh topology. In star each device needs only one link and one i/o port to connect it to any number of others. Advantages: Easy to install Easier to troubleshoot Widely used Centralized management Easy to add devices to network One break does not bring whole network down Disadvantages: If you have only one central device and it fails, it brings the network down Costs are usually higher than with bus or ring networks Bus : A bus topology is multi-point. One long cable acts as a backbone to link all the devices in a network. Nodes are connected to the bus cable by drop lines and taps. A drop line is a connection running between the device and the main cable. A tap is a connector that either splices into the main cable or punctures the sheathing of a cable to create a contact with the metallic core. As a signals travels along the backbone, some of its energy is transformed into heat. Therefore, it becomes weaker and weaker as it travels farther and farther. For this reason there is a limit on the number of taps a bus can support and on the distance between those taps. Advantages: Easy to install Easy to add new systems to network Great for small networks Disadvantages: If cable breaks whole network is down Out-of-date technology Can be difficult to troubleshoot Ring : In ring topology, each device has a dedicated point- to-point connection with only the two devices on either side of it. A signal is passed along the ring in one direction, frm device to device, until it reaches its destination. Each device in a ring incorporates a repeater. When a device receives a signal intended for another device, its repeater regenerates the bits and passes them along . A ring is relatively easy to install and reconfigure. Each device is linked to only its immediate neighbors. To add or delete a device requires changing only two connections. Advantage: Great for small networks Easy to install Disadvantages: Unmanageable in a large network Out-of-date technology network Can be difficult to troubleshoot Catagories of network: Today when we speak a network , we are generally referring to two primary categories: Local area networks and Wide area networks. The category into which a network is falls is determined by its size. A LAN covers small area and WAN can be world wide. Network of a size in between are normally referred to as metropolitan area networks and span tens of miles. Local area network: A local area network is usually privately owned and links the evices in a single office, building or campus. Depending on the needs of an organization and the types of technology used, a LAN can be as simple as two PCs and a printer in someones home office; or it can extend throughout a company and include audio and video peripherals. currently LAN size is limited to a few kilometers. LAN’s are designed to allow resources to be shared between personal computers or workstations. The resources to be shared can include hardware (e.g a printer) , a software (e.g an application program), or data. Wide area network: A wide area network provides long distance transmission of data image, audio and video information over large geographic area that may comprise a country, a continent, or even the whole world. A WAN can be as complex as the backbone that connect the internet or as simple as a dial up line that connects a home computer to internet. METROPOLITAN AREA NETWORK: A MAN is a network with a size between the LAN and a WAN. It normally covers the area inside the town or a city. It is designed for customers who need a high speed connectivity, normally to the internet. A good example of MAN is the part of telephone company network that can provide a high speed DSL line to customers. Another example is tv cable network.