Nt1310 Unit 3 Assignment 1

Layer 3: Network Layer– This layer determines how the data will be transmitted between networks. Packets are routed to the unique network device addresses. At this layer, if large data is not able to be sent through the network, they are broken down into smaller pieces.

The Data link layer [also called layer 2] is responsible for moving a message from one computer or network device to the next computer or network device in the overall path from sender or receiver. It controls the way messages are sent on the physical media. Both the sender and receiver have to agree on the rules or protocols that govern how they will communicate with each other. A data link protocol determines who can transmit at what time, where a message begins and ends, and how a receiver recognizes and corrects a transmission error.

These two layers perform routing and deals with end to end issues. The hospital currently uses a CISCO ASA 5510-VPN router to connect to the internet. Finally the session layer, presentation layer, and application work together to make the network operational. These three layers actually make all the data be visible to the end users. These layers also make the data and network usable to the operator. Patton-Fuller utilizes Windows Explorer and its company’s webpage for these layers (Patton-Fuller, 2013).

Let's analyze the various attacks and threats to which our network can be a victim. For a better understanding I'll start from the most external layer of the network.

Today, security devices such as Firewall, IDS are used on the many organization's networks for preventing security attacks. But, these devices can only diagnose illegitimate traffic and prevent it. They cannot prevent attacks which are as a result of the network devices vulnerabilities in the switches, routers, and etc. A malicious user who is within the network can implement many attacks by using these vulnerabilities. This paper explains the kind of existing vulnerabilities in Cisco switches and methods of preventing these attacks from

The third layer is the network layer. In the network layer data is routed through various physical networks while traveling to a known host. Information contained in the network layer allows routers to make decisions on how the data gets to its destination. Security

Our plan will include network security, which will protect the network. It will protect the usability, reliability, integrity, and safety of the network and data. Plan will also include host based security system. These will include applications to monitor detect, and counterattack against the hosts networks and systems. There are many types of security methods can be used to secure a network.

With the increasing use of technology today with computers, there are better ways we can came up with to stop vulnerabilities in a network. As organizations increase their reliance on, possibly distributed, information systems for daily business, they become more vulnerable to security breaches even as they gain productivity and efficiency advantages. Network security is the becoming more important to a business because of the networks and applications. You never know when someone is coming for your business system. Looking at every strategy you have going on for your business. Need to have the set of tools for the security walls to be high. When dealing with hackers or competition all servers not to be access easily. There is a large amount

The MAC sub layer is responsible for handling single-hop reliable communications. It uses the security levels that are mentioned by the upper level layers.

The Internetwork layer is the layer that handles network configuration and is considered the heart of the TCP/IP protocol suite.

1. Describe the 7 layer OSI model of communication layers? Discuss Each Layer in detail.

As you can see from the image above (Figure 3-3), Layer 7 is the Application Layer; the place where data both originates and returns. This is also the layer where the user is directly interfacing with an application, such as a web page. An attack against this layer is generally intended to disrupt certain components of an application. Thus, Application Layer attacks are also referred to

The networking applications of the OSI model are mail, web, file transfer, management, and remote connections.

It is vital to integrate these four steps into any network intended to be secure. Properly configured a secured network will be able to protect itself from attacks like PW hacking, DDOS attacks, brute force attacks, and insiders abusing their system rights (internal and external).

The presentation layer receives the message and put it in a form that the receiving machine understands. The data encryption and decryption if needed occurs at this layer as well. The information generated at this layer is put into a header called data, which is added to the header received by the application layer. Now the presentation layer passes the new data to the session layer. In addition, the presentation layer at the receiving computer takes the header delivered by the lower layer (the session layer), decodes it, and presents the new data to the user at the application layer.8