ISSC341 Central Texas Open Systems Interconnection Case Discussion
Question Description
Hello,
I need two responses of at least 150 words each for the below students discussions for this week. Also in the bold below are the questions the students at answering.
For this assignment, you will post your answers to the questions below prior to 11:55p.m. ET on Wednesday. You are required to respond to at least two of your classmates’ post by 11:55p.m. on Sunday. Please do not be late with the post because your classmates will be relying on you to post on time. Your follow-up posts can add additional insight to a classmate’s opinions or can challenge their opinions. Use examples from the readings, or from your own research, to support your views, as appropriate. For your follow-up posts this week, you may wish to visit a couple of the web sites contributed by your classmates and share your opinion of these sites with the class. Be sure to read the follow-up points to your own points and reply to any questions or requests for clarification. You are encouraged to conduct research and use other sources to support your answers. Be sure to list your references at the end of your post. References must be in APA citation format. All posts must be a minimum of 250-300 words. All follow-up posts to your classmates must be minimum of 150 words for each required post. Peer responses will not be accepted after the due date.
The Reference Model is a conceptual framework for understanding how computers communicate. The OSI model defines seven different layers of communication rules. Each layer of the OSI model has its own means of communication or protocol. The OSI model is used as a reference when explaining how data passed over the network moves through each layer. Each of the seven layers has specific responsibilities and logically interfaces to the layer above or below it. Each layer in the OSI model provides a different service needed for communication across an IP network and physical media. The top three layers often are called the “upper layers” since they deal primarily with application data. The lower layers deal primarily with getting packets to their destination. Many refer to these layers as infrastructure.
Questions:
1. For this discussion, compare and contrast two layers of the Open Systems Interconnection (OSI) Reference Model, including the protocols that run on each layer.
2. What was the reason that IPv6 was introduced? Why do you think many organizations are not upgrading their network solely to IPv6 and run that protocol instead of running IPv4?
3. What is the purpose of subnetting when using IPv4 addressing? What role does subnet mask play in subnetting of IPv4?
Student one:
Hello class! This first week of the Intro to Networking we’re discussing the Open Systems Interconnection (OSI) Specifications, as well as IPv4 and IPv6.
For the first question, I figured it would be interesting to compare and contrast the first layer, Physical, to the last layer, Application, as both vary widely in their purpose but also have some similarities. The Application layer is the point in the OSI model that concerns the data that goes to the application that the user interacts with. For example, if a user is waiting on an email to be sent to them so they can see it in their mailbox, the email being sent from the sender is received at the point where the SMTP server is connected to the network, and then the packet containing some or all of the email message goes through each of the other six layers of the OSI model, dropping its headers until it reaches the Presentation layer, at which point is presented to the computer to use it on the mailbox GUI that the user interacts with. The Physical layer is where the packet leaves a network to travel as a digital signal along a wire that’s been modulated from a bit code at the Data Link layer (Lammle, 2012).
Internet Protocol version 6 (IPv6) was initially proposed in 1994 by the Internet Engineering Task Force (IETF) as a way to address the concerns of a global IPv4 address shortage. This new version of IP would be able to support a lot more addressed devices, since IPv6 uses a 128-bit addressing scheme instead of a 32-bit scheme like IPv4. This would help preserve addressing space and address the growing need of network devices in businesses. I think the main reason companies may not be quick to adopt IPv6 over IPv4 is that they may continue to use legacy devices on an already established IT infrastructure, so it makes sense for them to continue to use IPv4 and use Network Address Translation (NAT) to preserve their IPv4 addressing space instead of switching to a completely different scheme (IPv6.com, 2018).
The purpose of subnetting in IPv4 networks is to logically separate networks for easier management of multiple nodes in an enterprise setting, and for the purpose of departmentalization. Subnets in a network can use firewalls to prevent sensitive information from b