Communications and Network Security/Network Devices, Attacks and Perimeter Security. After reading this week’s materials, please respond to one or more of the following questions. Describe the functions of hubs/repeaters, bridges, switches, routers, and gateways. At what layers of the OSI model does each device operate? Describe the following types of network attacks: denial of service (and DDoS), malformed packet attacks, flooding, sniffing, Ransomware, DNS hijacking, and drive-by download. Give an example of a DoS or DDoS attack and describe how it overwhelms a target system. Depending on their needs and budget, companies can choose from a variety of perimeter security options. Discuss the differences between packet-filtering, stateful inspection, proxy, dynamic packet filtering, kernel proxy, and next generation firewalls and how they provide security filtering to protect the perimeter. Describe the functions of hubs/repeaters, bridges, switches, routers, and gateways. At what layers of the OSI model does each device operate?

    Hubs/Repeaters – They work at the tangible lamina that is pregnant with regenerating the “eminent balance the similar network antecedently the eminent becomes too unconfirmed or corrupted so as to stretch the prolixity to which the eminent can be transmitted balance the similar network” (GeeksforGeeks, n.d.).

    Bridges – Used coercion interconnecting span LANs that are on the similar protocol, a bridge is essentially a repeater with adventitious functionality that work at the facts join lamina (GeeksforGeeks, n.d.).  By balbutiation the MAC address of twain fount and minor receiver, the bridge is effectual to refine content (GeeksforGeeks, n.d.).

    Switches – As a facts lamina emblem, the switch is a bridge with multi ports designed to boost its willingness and work by conducting blunder checks former to coercionwarding facts (GeeksforGeeks, n.d.).

    Routers – A network lamina emblem that “routes facts packets naturalized on their IP addresses” (GeeksforGeeks, n.d.).

    Gateways – Also unconcealed as protocol converters, gateways can work at any network lamina (GeeksforGeeks, n.d.).  Essentially, they are a avenue that connects span divergent networks (GeeksforGeeks, n.d.).