Why Network Security Model Is So Important


Five most important security groups that need to be considered when implementing any company security strategy. They comprise security policy perimeter, network, transaction and monitoring security. These are all part of any successful security plan for your company. Any enterprise network is surrounded by a perimeter which represents all equipment and circuits that connect to external networks, both private and public. The servers, data, and devices utilized in the company’s operations are part of the internal network. The demilitarized zone (DMZ) represents a location between the internal network and the perimeter made up of firewalls and public servers. It permits access to network servers for some outside users, but it blocks traffic to internal servers. This doesn’t mean that every user outside will be denied access to internal networks.  A well-designed security plan will identify who has access to what information and where. For instance , telecommuters may make use of VPN concentrators on the perimeter to gain access to Windows as well as Unix servers. Business partners can also use an Extranet VPN connection for access to the company S/390 Mainframe download missing dll. Determine the security requirements on all servers to safeguard company applications and files. Determine the transaction protocols needed to protect data when it travels across secured and non-secure networks. As a proactive defense strategy against external and internal attack, monitoring processes must be implemented that track the flow of data in real time. Recent research has revealed that hacker attacks are more prevalent than internal attacks perpetrated by angry employees and consultants. It is essential to take care of security issues with viruses since sessions can be affected by viruses at their application layer via e-mail, file transfer, or other methods.

Security Policy Document

The security policy document outlines different policies that are applicable to all employees who use the corporate network. It outlines the things employees are permitted to do, and what resources. It also includes non-employees well as consultants as well as business partners, clients , and fired employees. Security guidelines for Internet email and detection of viruses are specified. It defines what cyclical process or process is used to examine and enhance security.

Perimeter Security

This is the initial step that external users must take care of before they can authenticate with the network. This is security for all traffic that originates from the outside network. A variety of components are utilized to protect the perimeter of a network. This review examines all perimeter devices that are currently being used. Routers, modems and firewalls, TACACS servers and RADIUS servers are all examples of perimeter devices.

Network Security

This is defined as all of the server as well as the legacy host security systems that are used to authenticate and authorize both employees, both internal and external. Once a user has been authenticated through perimeter security, it is the security aspect that has to be dealt with before starting any applications. The network is designed to transport traffic between workstations and network applications. Network applications run on a shared server that may run an operating system, such as Windows, Unix or Mainframe MVS. The operating system is responsible for storing data as well as responding to requests for information, and maintaining security. After a user has been authenticated to a Windows ADS domain using a particular user account, they’re granted privileges. This includes the ability to be able to access directories specific to several servers, start applications, and manage a portion or all of the Windows servers. When a user authenticates with the Windows Active Directory Services distributed it does not belong to any particular server. It has huge benefits in terms of management and availability due to the fact that the accounts are all managed in a central manner and the security database copies are maintained at various servers throughout the network. Unix and Mainframe hosts usually need the login of a specific system, however , the rights on the network can be shared to multiple hosts.

* Domain operating system of the network operating system authentication and authorization

* Windows Active Directory Services authentication and authorization

* Unix and Mainframe host authentication. Authorization

* Application authorization per server

* File and data authorization

Transaction Security

Transaction security works from a dynamic angle. Every session is secured by five major actions. They are integrity, non-repudiation security, authentication, confidentiality and virus detection. Transaction security is a way to ensure that session information can be securely transmitted across the organization or over the Internet. This is essential when working with the Internet as data can be misused with no authorization. E-Commerce uses industry standards, such as SET and SSL which define the protocols that offer non-repudiation integrity, authentication and confidentiality. In addition, virus detection can provide security for transactions by checking data files for indications of infection prior to when they are transferred to an internal user or before they are transmitted over the Internet. Below are industry-standard security protocols.

Non-Repudiation RSA Digital Signatures

Integrity – MD5 Route Authentication

Authentication – Digital Certificates

Confidentiality – IPSec/IKE/3DES

Virus Detection Antivirus Software McAfee/Norton Antivirus Software

Monitoring Security

Monitoring network traffic for vulnerabilities, security threats and other unusual events is essential to any security plan. This analysis reveals what methods and tools are employed. Here’s a list of typical monitoring options. To track traffic entering your perimeter intrusion detection sensors can be used to monitor it. IBM Internet Security Scanner is an excellent vulnerability assessment test tool that should be considered for your business. Syslog server messaging, the Unix application that records security events to the log file to be inspected, is used in many organizations. Audit trails are essential for logging network changes and identifying security problems. Big companies that utilize a lot of analog dial lines to connect modems sometimes employ dial scanners to detect open lines that could be used by hackers specializing in security. Facilities security is typically access for badges to equipment and servers that house mission-critical data. Systems for badge access track the time each employee entered and exited the telecom room. Cameras can record the specific tasks were performed in addition.

Intrusion Prevention Sensors (IPS)

Cisco offers intrusion prevention sensors (IPS) to corporate clients, increasing the security level of their networks. The Cisco IPS 4200 Series employs sensors placed in strategic places to safeguard routers, switches and servers from hackers. IPS sensors can monitor the traffic on networks in real-time or inline, and compare packets with known signatures. If the sensor finds suspicious behaviour, it will issue an alert, halt the packet and take some defense measures to stop the attack. The IPS sensor is available inline IPS, IDS that doesn’t allow traffic to flow through the device, or as a hybrid device. The majority of sensors in the data center network are designated the IPS mode that has its highly dynamic security features, which stop attacks immediately after they happen. IOS intrusion prevention software is available to be bought with routers today.

Vulnerability Assessment Testing (VAST)

IBM Internet Security Scanner (ISS) is a vulnerability scanner that is targeted at enterprises to assess the vulnerability of networks from both an external and internal perspective. Agents can be used to examine various servers and network devices for security vulnerabilities or weaknesses. The process consists of network discovery and data collection, as well as analysis and reports. The data is collected from routers, switches, servers, firewalls, workstations, operating systems and network services. Potential vulnerabilities are verified using non-destructive tests and recommendations provided for fixing any security vulnerabilities. There is a reporting facility accessible with the scanner which presents the information findings to company staff.

Syslog Server Messaging

Syslog Syslog is an Unix program that monitors Cisco IOS’s devices and reports on errors, is available. Most routers and switches create Syslog messages that are sent to a designated Unix workstation for analysis. If your Network Management Console (NMS) is using the Windows platform There are tools that let you view log files as well as sending Syslog files between Unix NMS and a Windows NMS.

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