Each must be at least 150 words and contain relevant information. DO not just comment on the other persons writing, or simply state you agree or disagree. 1) Module 1 OSI Model The main concept of OSI is that the process of communication between two endpoints in a telecommunication network can be divided into seven distinct groups of related functions, or layers. Each communicating user or program is at a computer that can provide those seven layers of function. So in a given message between users, there will be a flow of data down through the layers in the source computer, across the network and then up through the layers in the receiving computer. The seven layers of function are provided by a combination of applications, operating systems, network card device drivers and networking hardware that enable a system to put a signal on a network cable or out over Wi-Fi or other wireless protocol.2) Discussion Question OSI and TCP/IPWhat is your previous exposure to OSI and TCP? Do you have a firm grasp on IPv4 addressing? While not directly part of the course, they are important bedrock principles that help along the way.3) Discussion Question CNDResearch Computer Network Defense (CND) and host-based protections.Compare each discussing two similarities and two differences. Why are both needed?4) Discussion Question Network Security Research the Cisco® website for network threats.Choose four common threats and explain why you think they pose the biggest threat to network security.5) Pluralsight OSI Model Hello everyone! I am going through this video very slow. I really liked the way Ed Liberman explains the OSI model I am doing other things but watching this video at my pace I can not wait to here the TCP/IP model. I liked the way he broke down the 7 layer applications with different words such as All People Seen To Need Data Processing to remember the layers Application, Presentation, Session, Transport, Network, Data Link and Processing that was pretty cool. Then he explains the functions as of the Model Application-Network API (Application programming interface) Presentation -Formating, Session-Sycronization, Transport-Packets, Network-Addressing/Routing, Data Link-Data Frames, Physcial-Hardware. He explains how the transaction of the application works from sending to receiving it stuck to my head sending goes down and receiving goes up. Sending also collects data from every layer going down and as it goes to receiving part it stripes off layers like in a circle from sending to receiving that was prettying interesting.6) plural sight TCP/IP model TCP/IP Model is based on 4 layers the DARPA Model ane each layer has individual protocols which all work together to form a protocl stack. TCP/IP is widely used and it can also used in a business and as private communication. The four layer protocols; application-http, smtp, dns, ftp, rip, snmp. Transport-TCP, UDP. Internet-IP, ARP, ICMP, IGMP and Network Access- Ethernet and Token Rings.TCP (Transmission Control Protocols) are one-to-one, connection oriented, reliable communicationUDP (User Datagram Protocol) connectionless, unreliable communicationTCP uses a 3 way handshake to establish the connection this is interesting I used wire shark on one of my classes and you can see the handshake as I was listening to video this came to mindInternet Layer Protocol IP (Internet Protocol Address)ARP (Address Resolution Protocol) resolves an IP address to hardware address to hardware address7) Discussion Question OSI and TCPRE OSI TCP My first thought was, what the heck are you talking about Adam and then I realized, you must mean the OSI model. Where in the model TCP/IP falls, what layers of communications and where the communication falls into. If this is not the case, please let me know. Though I have never heard the OSI model referred to as just OSI but I guess it makes sense.I am pretty familiar with both, have experience with physical/media layers with coax, rj45, fiber, etc… as well as transport layers like tcp and udp, and being able to break down preambles, packets, etc…I think it is a good starting point to understand the language by which we speak. In this case computer talk. Almost everything now is TCP/IP but in the past have work with ATM, Token Ring and FDDI but please don’t ask me questions, it has been way to long ago.8) Module 1 OSI Module Layers TCP/IP and OSI are the two most widely used networking models for communication. There are some similarities and dissimilarities between them. One of the major difference is that OSI is a conceptual model which is not practically used for communication, whereas, TCP/IP is used for establishing a connection and communicating through the network.Key Differences between TCP/IP and OSI ModelTCP/IP is a client-server model, i.e. when the client requests for service it is provided by the server. Whereas, OSI is a conceptual model.TCP/IP is a standard protocol used for every network including the Internet, whereas, OSI is not a protocol but a reference model used for understanding and designing the system architecture.TCP/IP is a four layered model, whereas, OSI has seven layers.TCP/IP follows Vertical approach. On the other hand, OSI Model supports Horizontal approach.TCP/IP is Tangible, whereas, OSI is not.TCP/IP follows top to bottom approach, whereas, OSI Model follows a bottom-up approach.