Network Security as the preventative measures taken to safeguard network infrastructure from unauthorized access, modification, malfunction, misuse, improper disclosure or destruction of data.

Ensuring the security of a network is a matter of great importance and requires great attention. Security should be evaluated and implemented in terms of all devices operating on a network. In addition, it is very important to ensure that security is uninterrupted.

There are a few network security tools and techniques designed to help you do just that:

How To Ensure Network Security?

Ensuring Physical Security

If an intruder can physically access the host device, they can easily take control of the device. Particular attention should be paid to this issue and necessary precautions should be taken. Some physical security methods that can be taken are;

• Devices should only be kept in rooms or lockers (cabinets) that the administrator has the authority to open.
• It is wise to keep the names of those who have physically accessed the device in a list showing the access times.
• Cables should be labeled and what they are doing should be determined. Unused cables must be removed from the network.
• Access information to the device should not be kept in public.
• Power sources should be located and locked out of sight. Thus, the intruder should be prevented from cutting power.

Password Management

The most effective way of password management is to use an approval mechanism system using "LDAP" or "RADIUS" authentication servers. Even if such a mechanism is used, a locally defined password must be available in the configuration file for the use of authorized rights. Most of the manageable devices have two different usage options called user accounts and administrator accounts. While users can only examine the interfaces and work, administrators have the right to make changes to the device settings. While keeping a password in configuration files, it is absolutely necessary to keep it encrypted. In addition, when determining a password, care should be taken that a good password does not have the properties. An effective password;

• Contains uppercase and lowercase letters.
• Includes punctuation and numbers.
• Can be easily remembered so it doesn’t need to be written down.
• At least eight characters long.

Anti-malware software

Malware such as viruses, worms, Trojans, spyware, and keyloggers are designed to spread across computer systems and infect networks. The way to protect yourself from this software is through network security software designed to recognize dangerous programs and prevent them from spreading. Anti-malware and antivirus software can try to prevent malware from infecting the system, thereby minimizing the damage to the network.

Firewalls

Firewalls function much like gates that can be used to secure the borders between your network and the internet. Firewalls are used to manage network traffic, allowing authorized traffic through while blocking access to non-authorized traffic. Firewall software / devices are the building blocks of security and work in harmony with other security software / devices in the system and form the basis for future security technologies. Although firewall software is absolutely essential, it is not enough for security alone.

Virtual private network (VPN)

VPN tools are used to authenticate communication between secure networks and an endpoint device. Remote-access VPNs generally use IPsec or Secure Sockets Layer (SSL) for authentication, creating an encrypted line to block other parties from eavesdropping. Thanks to VPN, it is possible to both reduce our costs and move PCs and LANs in different places, which we could not do before because they were not safe and expensive, to the same platforms over the internet. In this way, it is possible for us to connect to our company while at home, access company resources, check our e-mails, and use the Intranet as if we were there.

Security Information and Event Management (SIEM)

Security Information and Event Management (SIEM) is a software solution that aggregates and analyzes activity from many different resources across your entire IT infrastructure. SIEM collects security data from network devices, servers, domain controllers, and more. SIEM stores, normalizes, aggregates, and applies analytics to that data to discover trends, detect threats, and enable organizations to investigate any alerts. Basically, SIEM is a data aggregator, search, and reporting system. SIEM gathers immense amounts of data from your entire networked environment, consolidates and makes that data human accessible. With the data categorized and laid out at your fingertips, you can research data security breaches with as much detail as needed.

IDS (Intrusion Detection Systems)

Intrusion Detection Systems have become one of the most important issues that are needed as a result of attacks on personal or legal pages, especially with the increase of web traffic used all over the world and the popularization of web pages in the development process of the Internet world. In addition, the possibility that the servers such as mail, dns, database, which are owned by institutions or organizations and kept open to the whole world, may be exposed to similar attacks has made Intrusion Detection Systems an indispensable part of the Internet Security field. IDS's can keep a record of the traffic they listen to and, when necessary, generate reports based on these records. When they detect an attack, they can prevent attacks, notify their administrators by e-mail or similar means, run a pre-created program, and record telnet-like connections and monitor them afterwards. With all these features, IDSs help the system to operate safely and help System Administrators monitor the System strongly.

It is obvious that today cyber threats are more than ever in terms of both number and complexity, and therefore networks are very vulnerable to attacks that can cause great harm. However, if proactive measures are taken and the above mentioned methods are applied, network security can be achieved to a great extent.

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