Question

Research a company that sells network equipment (like Cisco, Juniper, Netgear, etc). Use Table 2. For each OSI layer, identify and describe in detail a hardware device best suited for each layer of the model. Refer back to chapters 2 and 7 for commonly used network hardware. For each hardware component selected, include the model number and device specifications.

Answer 1

The Open Systems Interconnection (OSI) model describes seven layers that computer systems use to communicate over a network.

• OSI consists of seven layers, and each layer performs a particular network function.
• OSI model divides the whole task into seven smaller and manageable tasks
• Each layer is assigned a particular task. There are seven layers

Each layer is self-contained, so that task assigned to each layer can be performed independently.

     

  

No No	OSI Layer	Hardware Component	Device specification
77 7	Application Layer	Gateways,Firewalls, all end devices like PC’s, Phones, Servers	Pc and phones other device provide the interface between the applications and network
6 h 6	Presentation Layer	Gateways, Firewalls, PC’s.	Gateways-In computer networking, a gateway is a component that is part of two networks, which use different protocols. Firewalls-A firewall is a system designed to prevent unauthorized access to or from a private network
5    5	Session Layer	Gateways, Firewalls, PC’s.	PC-personal computers are used in session layer
h 4	Transport Layer	Gateways, Firewalls	Gateways-In computer networking, a gateway is a component that is part of two networks, which use different protocols. Firewalls-A firewall is a system designed to prevent unauthorized access to or from a private network
3 3	Network Layer	Routers, Brouters	Router-A router is a switch like device that routes/forwards data packets based on their IP addresses. Brouters-A bridge router or brouter is a network device that works as a bridge and as a router.
2 2	Data Link Layer	Bridges, Modems, Network cards	Bridges: A bridge is a type of computer network device that provides interconnection with other networks . Modems-A modem converts digital signals generated by the computer into analog signals Network cards-Network interface card is an electronic device that is mounted on ROM of the com that connects a computer to a computer network
1 1	Physical Layer	Hubs,Repeaters,cables, fibers, wireless, Radio, microwave etc	-Hubs: it is commonly used to connect LAN.it contain multiple i/o port. Repeaters-it used in transmission systems to regenerate analog or digital signals distorted by transmission loss. Cables-it interconnect the devices. Mainly used cables are coaxial cable, optical fiber cable, and twisted pair cable. Fiber-fiber is used to increase information security during data transmission without the need for cryptographic approaches