Security is Everyone's Job

Security Basics

Network security is the practice of preventing unauthorized users from accessing computer networks and their associated devices.

.It involves physically protecting network servers and devices from external threats, as well as taking steps to secure the digital network

How do networks work

One of the most widely used frameworks to understand how networks communicate is the OSI (Open Systems Interconnection) model, which divides the network communication process into seven layers: application, presentation, session, transport, network, data link, and physical.

Each layer has a specific function and interacts with the adjacent layers.

For example

The application layer is where users interact with services across a network, such as web browsers or email clients.

The presentation layer ensures that data is in a usable format for both the application and the lower layers.

The session layer maintains connections between devices and applications.

The transport layer forwards data to the appropriate service on the destination device.

The network layer determines the best path for data packets to travel on a network.

The data link layer identifies and addresses the physical devices on a network.

The physical layer provides the infrastructure to transport data, such as cables or wireless signals.

What is network security

Network security involves implementing various solutions at different layers of the OSI model to protect data and devices from unauthorized access, modification, or destruction.

Basic Security Principles

Antivirus software: Antivirus software can be installed on all network devices to scan them for malicious programs, such as viruses, worms, or ransomware. It can also block or remove any detected threats.

Encryption: Encryption is the process of scrambling data to make it unreadable by anyone who does not have the correct key to decrypt it. Encryption can be applied to data in transit (such as when sending an email or browsing a website) or data at rest (such as when storing files on a hard drive or cloud service). Encryption can prevent unauthorized users from intercepting or accessing sensitive data.

Firewalls: Firewalls are devices or software that monitor and filter incoming and outgoing network traffic based on predefined rules. Firewalls can block unwanted or malicious traffic from reaching a network or device, such as hackers, malware, or denial-of-service attacks.

IDS/IPS: Intrusion detection and prevention systems are devices or software that analyze network traffic for signs of malicious activity, such as unusual patterns, anomalies, or signatures. IDS/IPS can alert network administrators of potential attacks and take actions to stop them, such as blocking traffic or isolating infected devices.

Access control: Access control is the process of granting or denying access to network resources based on user identity, role, or policy. Access control can ensure that only authorized users can access sensitive data or devices, and prevent unauthorized users from gaining access. Access control can be implemented using various methods, such as passwords, biometrics, tokens, certificates, or multifactor authentication.

What can you do

Keep your software updated: Software updates often contain patches for security vulnerabilities that could be exploited by hackers. Keeping your software updated can reduce the risk of being attacked by known threats.

Use strong passwords: Passwords are one of the most common ways to authenticate users on a network. Using strong passwords that are long, complex, and unique can make it harder for hackers to guess or crack them. You should also avoid using the same password for multiple accounts or services, and change your passwords regularly.

Use a VPN: A VPN (virtual private network) is a service that creates a secure connection between your device and another network over the internet. A VPN can encrypt your data and hide your IP address, making it harder for hackers or third parties to track your online activity or intercept your data.

Avoid phishing emails: Phishing emails are fraudulent emails that try to trick you into revealing your personal information, such as passwords, bank details, or credit card numbers. Phishing emails often look like they come from legitimate sources, such as your bank, your employer, or a familiar website. You should always be careful when opening emails from unknown senders or clicking on links or attachments in emails. You should also verify the sender’s identity and the email’s authenticity before responding or providing any information.

Educate yourself and others: One of the most important aspects of network security is human awareness and behavior. You should always be aware of the potential risks and threats that exist on the internet and how to avoid them. You should also educate others who use your network or devices about the importance of network security and how to follow best practices.