Cyber attacks are increasingly sophisticated, with 39% of UK businesses reporting incidents last year, costing an average of £3.4 million per breach. Ransomware attacks surged by 66% between 2022 and 2023, targeting organisations of all sizes. Remote work and supply chain vulnerabilities have expanded the attack surface, leaving many businesses exposed.
To protect your IT systems, focus on these key areas:
- Set Security Policies & User Access Controls: Define clear rules, enforce least privilege access, and implement multi-factor authentication (MFA).
- Keep Systems Updated: Regularly patch software, prioritise critical updates, and replace unsupported systems.
- Segment & Monitor Networks: Isolate sensitive assets using VLANs or VPCs and monitor traffic with firewalls and intrusion detection systems.
- Encrypt Data & Maintain Backups: Use AES-256 encryption for stored and transmitted data, and follow the 3-2-1 backup rule with regular testing.
- Run Security Tests & Train Staff: Conduct vulnerability scans, penetration tests, and phishing simulations. Provide ongoing cybersecurity training.
These steps not only reduce risks but also help meet UK compliance standards like GDPR. Cybersecurity isn’t a one-off task – it’s an ongoing process that requires vigilance and regular updates.
Infrastructure Security – Guide to Network Security Fundamentals – CompTIA Security+
Set Up Security Policies and User Access Controls
Security policies and user access controls form the backbone of any effective IT security framework. They define who has access to what, under what conditions, and create safeguards that protect against unauthorised access and reduce the risk of cyberattacks stemming from human error.
When combined, these policies and controls work in harmony. While policies provide the rules and guidelines, access controls enforce them. Together, they create a strong line of defence against both external threats and internal vulnerabilities. Let’s break down how to establish these measures effectively.
Create Clear Cybersecurity Policies
A well-crafted cybersecurity policy is more than just a document gathering dust in a drawer – it’s a practical tool that guides daily operations and addresses real-world challenges. It should be straightforward, actionable, and relevant to your organisation’s unique needs.
Start with acceptable use policies. These guidelines should clearly outline what employees are allowed to do with company systems and resources. For instance, specify rules around downloading software, checking personal emails, using USB drives, or connecting personal devices to the network. Be explicit about the consequences of non-compliance, as vague warnings rarely lead to meaningful behavioural changes.
Equally important are incident response procedures. Your policy should detail what employees need to do if they encounter suspicious activity or inadvertently click on a malicious link. Include clear, step-by-step instructions for reporting incidents, contact details for the appropriate team or individual, and immediate actions to minimise potential damage. A swift and informed response can significantly reduce the impact of a security breach.
Don’t overlook regulatory compliance. Organisations in the UK must adhere to frameworks such as the UK GDPR, the Computer Misuse Act 1990, and, for some sectors, standards like Cyber Essentials. Aligning your policies with these requirements not only ensures compliance but also strengthens your overall security posture.
Make these policies easily accessible to all employees. Store them on your intranet or include them in a staff handbook, ensuring they are readily available for reference. Schedule annual reviews to keep policies up to date with evolving threats and changing regulations – what worked last year might not be sufficient today.
Regular training is crucial to reinforce these policies. Use real-world examples and case studies during training sessions to illustrate the importance of each rule, helping employees understand the risks and encouraging consistent adherence.
Set Up User Access Controls
When it comes to user access, the principle of least privilege should be your guiding rule. This means granting employees only the permissions they need to perform their specific roles. For example, a marketing assistant wouldn’t need access to financial systems, and a finance clerk shouldn’t have editing privileges for your website.
Implementing role-based access control (RBAC) can make this process much simpler. Instead of managing permissions for each individual, create predefined roles based on job functions and assign users to these roles. If an employee changes departments or is promoted, you can update their role without having to adjust multiple permissions manually.
Adding multi-factor authentication (MFA) is another critical layer of security. Even if passwords are compromised, MFA provides an extra hurdle for attackers. Common methods include authenticator apps, biometric verification, and hardware tokens. Focus on implementing MFA for accounts with elevated privileges and those used for remote access, as these are frequent targets for cybercriminals.
Regularly review user permissions – ideally every quarter – and immediately disable accounts for employees who leave the organisation. Automated tools can help streamline this process and maintain secure audit trails.
Monitor access logs continuously to spot unusual activity before it becomes a major issue. Keep an eye out for irregular login times, access attempts from unexpected locations, or unauthorised attempts to reach restricted systems. Early detection of anomalies allows for a quicker response to potential threats.
Consider adopting zero-trust principles where feasible. This approach requires continuous verification of user identity and device security, rather than assuming trust based on network location. It’s particularly useful for organisations with remote teams or complex IT infrastructures.
Finally, invest in ongoing security awareness programmes. Simulated phishing attacks, refresher courses, and other training initiatives can help foster a culture of vigilance and accountability across your organisation.
For those aiming to enhance their cybersecurity expertise, NowSkills offers accredited IT infrastructure apprenticeships. These programmes combine expert instruction with hands-on experience, equipping teams with the skills needed to tackle modern security challenges.
With strong policies and access controls in place, the next step is to ensure your systems stay secure through timely updates and proactive risk monitoring.
Maintain System Security with Updates and Configuration
Keeping systems updated and properly configured is key to fending off cyber attacks. Hackers are always on the lookout for weaknesses in outdated software or poorly configured systems. Ignoring regular maintenance leaves the door wide open for potential breaches. This routine upkeep forms the backbone of a solid, multi-layered security approach.
Take the 2017 WannaCry ransomware attack as an example. It wreaked havoc across NHS trusts in the UK, exploiting unpatched Windows systems. The result? Cancelled appointments, delayed treatments, widespread disruption, and hefty financial losses. This incident led to a thorough government review and new patch management requirements for NHS organisations.
Create a Regular Update Process
Timely updates are essential for closing security gaps. Software vendors constantly release patches to address vulnerabilities that cybercriminals actively exploit. Delaying these updates increases the risk of ransomware, data breaches, or unauthorised access.
Start by cataloguing all your hardware and software assets. This includes servers, workstations, mobile devices, network equipment, and installed applications. Keep track of their current versions and patch statuses. Without an up-to-date inventory, it’s impossible to secure your systems effectively.
Enable automatic updates wherever feasible, but test critical updates first to avoid disruptions. For operating systems and essential applications, this approach ensures vulnerabilities are addressed promptly.
For larger organisations, centralised patch management tools like Microsoft Windows Server Update Services (WSUS) or third-party solutions such as Qualys VMDR can simplify the process. These platforms let you manage, test, and deploy updates across your network from a single dashboard. They also help track compliance and flag systems that need attention.
Prioritise critical updates, especially those targeting vulnerabilities actively being exploited. The UK’s National Cyber Security Centre (NCSC) regularly issues alerts about high-risk vulnerabilities requiring immediate action.
Don’t overlook network hardware updates. Devices like routers, switches, and firewalls often run firmware that needs regular updating. These devices are prime targets for attackers if left unpatched, as they control access to your entire network.
Finally, replace systems that no longer receive security updates. When vendors stop supporting older products, they become permanent vulnerabilities. Plan ahead to migrate away from unsupported systems before they become liabilities.
Once updates are under control, secure configuration further strengthens your defences.
Configure Systems Securely
A secure configuration reduces unnecessary risks by ensuring systems follow best practices from the start. Default settings are often designed for convenience, not security, leaving systems exposed.
Disable default accounts and change default passwords immediately. Default administrative accounts with predictable passwords are an easy target for attackers. Create new admin accounts with strong, unique passwords, and disable or rename the default ones. The NCSC highlights this as a basic yet crucial step.
Turn off unnecessary services and close unused ports. Each active service or open port is a potential entry point. Regularly audit your systems to identify and disable anything not essential to your operations. This reduces your attack surface and makes it harder for cybercriminals to find a way in.
Use configuration management tools like Ansible, Chef, or PowerShell Desired State Configuration (DSC) to enforce secure baselines across your systems. These tools help maintain consistency, improve security, and make troubleshooting easier.
Follow established security guidelines such as the Centre for Internet Security (CIS) Benchmarks. These provide detailed instructions for securing operating systems and applications, ensuring you’re aligned with industry standards and compliance needs.
Run regular configuration audits using tools like Nessus or Qualys. These scans highlight weaknesses and deviations from your security policies. Schedule them monthly or quarterly depending on your organisation’s risk tolerance and compliance requirements. Use the reports to prioritise fixes based on severity.
Keep version control for configuration files to track changes and quickly recover from misconfigurations. If something goes wrong, having a clear history of changes makes troubleshooting far more efficient.
Test configuration changes in a controlled environment before rolling them out to production systems. A test setup that mirrors your live environment ensures changes won’t disrupt operations or cause unexpected issues.
For organisations looking to build expertise in secure system management, NowSkills offers IT Infrastructure apprenticeships. These programmes combine theoretical knowledge with hands-on training, helping teams develop the skills needed for effective patch management and secure system configuration.
Use Network Segmentation and Monitoring
Network segmentation and monitoring are key defences in safeguarding critical systems. By separating sensitive assets and actively observing network activity, these measures reduce the risk of breaches and provide early warnings of potential threats. Together, they build on earlier security steps, offering an additional layer of protection for vital systems.
The World Economic Forum‘s Global Cybersecurity Outlook 2024 highlights network segmentation as one of the most effective strategies for mitigating ransomware and other sophisticated attacks.
Divide Networks Properly
Effective network segmentation involves isolating critical assets from general traffic, making it significantly harder for attackers to access sensitive systems even if they breach the outer defences. Start by identifying and cataloguing essential assets – such as financial records, HR data, intellectual property, and customer information. Then, map out how data flows between these systems. Group assets based on their sensitivity, keeping financial systems separate, isolating development environments from production, and ensuring guest Wi-Fi is segregated from internal networks.
For on-premises setups, use Virtual Local Area Networks (VLANs) to create these isolated segments. In cloud environments, Virtual Private Clouds (VPCs) serve the same purpose. For instance, a UK-based financial services firm saw a 40% drop in phishing-related lateral movement after implementing VLANs to separate customer data, internal operations, and public-facing services.
Apply the principle of least privilege to each segment, limiting access to only what is absolutely necessary. Regularly review and update segmentation rules to align with your organisation’s growth and changing needs. If you handle personal data, ensure your segmentation approach complies with GDPR by clearly separating systems that process such data and implementing robust access controls.
Once the network is segmented, secure each section with dedicated firewalls and intrusion detection systems to monitor for threats in real time.
Install Firewalls and Intrusion Detection Systems
Firewalls serve as the first line of defence, controlling traffic between network segments and blocking unauthorised access. They also enforce segmentation boundaries while generating detailed logs of network activity. Deploy both perimeter and internal firewalls with a default-deny policy, allowing only essential connections.
Enable logging on all firewalls to track allowed and blocked traffic, failed connection attempts, and rule violations. Ensure these logs are stored securely and included in your regular security monitoring processes.
Intrusion Detection Systems (IDS) add another layer of security by analysing network traffic for malicious activity. Place IDS sensors at strategic points, such as network chokepoints and within sensitive segments. Configure real-time alerts for critical events like repeated failed logins, detected malware, or unusual data transfers. Make sure these alerts are promptly routed to your security team.
To counter advanced threats, combine traditional signature-based detection with behavioural analytics. Modern IDS tools can learn normal network behaviour and flag anomalies that may signal persistent threats or insider attacks.
For public-facing services, deploy DDoS protection and Web Application Firewalls (WAF). These tools defend against large-scale attacks and application-layer vulnerabilities, adding yet another layer of security.
Maintain an accurate inventory of all network hardware – routers, switches, firewalls, and IDS devices. Regularly update their firmware and follow secure configuration practices. Use secure protocols like SSH v2 for managing devices, and disable outdated options like Telnet.
Finally, test your monitoring systems regularly to ensure they detect threats promptly and respond effectively. For practical training in network security, consider exploring NowSkills’ IT Infrastructure apprenticeships.
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Protect Data with Encryption and Backup Plans
After securing your systems with proper configurations and network segmentation, the next critical step is protecting your data. In today’s digital landscape, data is one of the most valuable assets for any organisation. Ensuring its security – whether it’s being stored or transferred – is vital to defending against ransomware, breaches, and other cyber threats that continue to challenge UK businesses.
According to the Information Commissioner’s Office (ICO), ransomware-related data breaches in the UK more than doubled between 2021 and 2023. Many of these incidents targeted organisations lacking proper encryption and backup measures. This highlights a simple truth: protecting your data isn’t optional – it’s a necessity.
Encrypt Data Storage and Transfer
Encryption is your first line of defence, turning readable information into an unreadable format that’s useless to hackers without the correct decryption keys. It’s a must for safeguarding both stored data and data in transit.
Data at rest encryption protects information stored on servers, databases, and backup systems. Even if a storage device is stolen or accessed by an unauthorised party, encrypted data remains secure without the appropriate keys. For maximum security, use strong encryption standards like AES-256.
Data in transit encryption ensures that information moving across networks remains secure from interception or tampering. Standard protocols like Secure Sockets Layer (SSL) and Transport Layer Security (TLS) are essential for encrypting web traffic. For remote access, Virtual Private Networks (VPNs) create secure tunnels, adding another layer of protection.
In March 2023, NHS Digital rolled out a new encryption and backup protocol across all trusts. This included managed key services and cloud-based backups, resulting in a 70% reduction in data recovery times during simulated ransomware attacks. Subsequent penetration tests revealed no successful data breaches.
For organisations handling personal data in the UK, encryption isn’t just a good idea – it’s often a legal obligation. Under GDPR, businesses must implement technical measures like encryption to safeguard personal data. This means your encryption practices should not only be effective but also well-documented and regularly reviewed to ensure compliance.
Key management is another crucial aspect of encryption. Encryption keys should be stored securely, separate from the encrypted data, and managed through dedicated systems like AWS KMS or Azure Key Vault. Access to keys must be tightly controlled, with regular audits and rotation policies in place to minimise the risk of compromise. Without strong key management, even the best encryption becomes vulnerable.
Create and Test Backup Plans
Backups are your safety net against data loss caused by cyberattacks, hardware failures, or human mistakes. However, backups only work if they’re properly implemented, regularly tested, and protected from the same threats targeting your main systems.
The 3-2-1 rule is widely regarded as the gold standard for backup strategies: keep three copies of your data, store them on two different types of media, and ensure one copy is stored offsite. This approach ensures your data remains accessible even if primary systems and local backups are compromised.
Automate backups to minimise human error and maintain consistency. Critical systems, including databases and configuration files, should be backed up regularly. For high-priority data, consider increasing the frequency to daily – or even hourly – based on your organisation’s tolerance for data loss.
To counter ransomware attacks that target backups, use immutable storage, which prevents any changes or deletions during the retention period. Many cloud-based solutions offer this feature, providing an additional layer of security.
In 2022, the UK law firm Gateley faced a ransomware attack that encrypted client data. Thanks to their encrypted, offsite backups, they restored operations within 48 hours without paying a ransom or losing data. Their IT director credited their quarterly backup testing and reliance on AES-256 encryption for the swift recovery.
Testing backups is just as important as creating them. Conduct quarterly tests to simulate real-world scenarios like ransomware attacks or accidental deletions. These tests should confirm that data can be fully restored – whether for an entire system or specific files. Key metrics like recovery time objectives (RTO) and recovery point objectives (RPO) will help ensure your backup strategy meets your organisation’s needs. If testing uncovers any issues, address them immediately. A backup that fails when needed is worse than having no backup at all.
Offsite and cloud-based storage is essential for protecting against local disasters or targeted attacks. Cloud solutions offer scalable, geographically distributed storage, simplifying management and enhancing resilience. Ensure that backups stored in the cloud are encrypted both in transit and at rest, with access controls that align with your security policies. Regular audits should verify that these systems remain secure and compliant with regulations.
For organisations looking to strengthen their expertise in data protection, NowSkills offers IT Infrastructure apprenticeships. These government-funded programmes include hands-on training in cybersecurity, encryption techniques, and backup best practices.
With encryption and backups in place, your organisation is better prepared to withstand data-related threats. The next step? Strengthening other areas of your IT infrastructure to create a truly resilient system.
Run Regular Security Tests and Staff Training
Keeping up with cyber threats requires more than just secure configurations and data protection measures. Regular security testing and staff training are indispensable in staying ahead of evolving risks. While yesterday’s defences might have been enough, today’s rapidly changing threat landscape demands constant vigilance and preparation.
Surprisingly, only 15% of organisations believe cyber skills and education will improve significantly in the next two years. This highlights an urgent need for proactive measures like testing and training to protect against potential breaches.
Run Vulnerability Scans and Penetration Tests
To identify weaknesses in your systems, vulnerability scans and penetration tests are essential tools. Vulnerability scans use automated processes to detect known security flaws, such as outdated software or misconfigurations. In contrast, penetration tests simulate real-world attacks, with security experts attempting to exploit vulnerabilities to uncover deeper, more complex issues.
These methods serve different purposes: scans provide a broad overview, while penetration tests focus on uncovering how multiple vulnerabilities might be exploited together. For instance, monthly vulnerability scans help address newly discovered threats, while annual or biannual penetration tests offer a more detailed analysis of your security posture. Scheduling scans outside business hours reduces disruption, but it’s vital to include all critical systems in the scope.
In April 2024, Nationwide Building Society, a UK-based financial services firm, conducted quarterly penetration tests and monthly phishing simulations. This initiative, led by their CISO, resulted in a 42% drop in successful phishing attempts and revealed three critical vulnerabilities, which were resolved within two weeks. Additionally, staff reporting of suspicious emails increased by 67%.
Every vulnerability identified should be documented with its severity, potential impact, and a clear timeline for remediation. Without prompt action, unaddressed vulnerabilities can render testing efforts pointless.
For organisations in the UK, compliance with the Data Protection Act 2018 and GDPR adds another layer of complexity. Security tests must be conducted in a way that protects personal data and adheres to regulatory requirements.
Common issues uncovered during testing include unpatched software, weak passwords, misconfigured firewalls, exposed sensitive data, and insecure network services. Penetration tests often reveal social engineering vulnerabilities, exposing gaps that technical measures alone cannot fix.
To address these gaps, technical defences must be paired with effective employee training.
Train Staff on Cybersecurity Awareness
While technical defences are vital, human error remains a major factor in cyber incidents. Training employees to recognise and respond to threats is one of the most impactful steps you can take.
Comprehensive training programmes should cover key topics like phishing and social engineering, strong password practices, secure use of company devices, data protection responsibilities under UK law, incident reporting procedures, and the importance of regular software updates. Real-life examples and interactive simulations make training more engaging and memorable compared to static presentations.
The best training combines flexibility with depth. Interactive e-learning modules allow employees to learn at their own pace, while in-person workshops enable detailed discussions and immediate clarification. Regular security bulletins ensure cybersecurity remains a priority between training sessions.
In January 2023, NHS Digital introduced mandatory cybersecurity training, including phishing simulations. Over six months, the rate of employees clicking on phishing links dropped from 18% to 4%, and incident reporting increased by 55%.
Phishing simulations are particularly effective, as they provide practical experience. By sending realistic test emails, organisations can gauge employee responses and identify areas needing improvement.
Training should occur at least once a year, with additional sessions after significant incidents or when new threats emerge. However, the most effective programmes reinforce lessons throughout the year. Monthly reminders, quarterly updates on new threats, and immediate alerts about active attack campaigns help maintain awareness.
Measuring the success of training is crucial. Key metrics include the number of vulnerabilities detected and fixed, reductions in successful phishing attempts, employee participation rates, post-training assessment results, and incident response times. Regularly reviewing these metrics helps refine your approach and demonstrates compliance with industry standards.
For organisations looking to build long-term expertise, NowSkills offers accredited IT Infrastructure apprenticeships that include cybersecurity awareness and practical security testing. These government-funded programmes allow employers to upskill their teams while embedding security best practices into everyday operations.
Conclusion: Building Secure IT Infrastructure
Protecting your IT infrastructure from cyber attacks requires a comprehensive, multi-layered strategy that covers every corner of your organisation’s digital landscape. From setting clear cybersecurity policies and enforcing strict access controls to keeping systems updated, segmenting networks, encrypting sensitive data, and regularly testing your defences, these steps collectively strengthen your resilience.
Waiting for a breach to happen is no longer an option. A proactive approach – identifying and addressing vulnerabilities before attackers can exploit them – is key. Not only does this reduce the likelihood of costly data breaches, but it also ensures compliance with UK regulations like GDPR and the Data Protection Act 2018.
Human error remains one of the biggest security risks. However, organisations that prioritise regular security audits and employee training have reported up to 70% fewer successful cyber attacks. Additionally, implementing strong encryption and backup strategies can cut the financial impact of a data breach by 30%. These measures directly tackle common vulnerabilities and help safeguard your operations.
Integrating cybersecurity into everyday practices is crucial. This involves embedding security measures into daily workflows – from how employees manage emails to how IT teams configure systems. Regular training is particularly effective, empowering your staff to act as the first line of defence against cyber threats rather than potential liabilities.
For organisations looking to develop skills further, government-funded training programmes provide valuable opportunities. For example, NowSkills offers accredited IT Infrastructure apprenticeships. These combine expert-led instruction with hands-on experience, helping organisations upskill both new and existing employees while building the technical know-how needed to maintain secure IT systems.
As cyber threats continue to evolve, trends like zero-trust security models and enhanced protection for cloud infrastructure are reshaping how organisations approach IT security. By following the structured steps outlined in this guide and investing in ongoing staff development, UK organisations can establish resilient IT infrastructures that not only address today’s threats but also adapt to tomorrow’s challenges.
Cybersecurity is not a one-and-done task – it’s a continuous commitment. Regularly reviewing, updating, and fine-tuning your security measures ensures your defences stay effective in the face of an ever-changing threat landscape.
FAQs
What are the best practices for securing user access in a remote work setting?
Securing user access in a remote work setup is essential to keep sensitive data and systems safe from cyber threats. A good starting point is to use multi-factor authentication (MFA). This adds an extra layer of security by requiring more than just a password to log in. Alongside MFA, enforce strong password policies that require employees to create unique and complex passwords, and make sure these are updated regularly.
Another key step is applying the principle of least privilege. This means limiting users’ access to only the resources they need for their specific roles, reducing the risk of unauthorised access. To further protect data, especially when employees are using public or unsecured networks, implement virtual private networks (VPNs). VPNs encrypt connections, keeping transmitted data secure.
Finally, don’t underestimate the importance of regular security training. Equip employees with the knowledge to identify phishing scams and other common threats they might encounter while working remotely. This proactive approach strengthens your organisation’s overall security posture.
How can organisations in the UK keep their cybersecurity policies aligned with evolving regulations like GDPR?
To keep up with the ever-changing UK regulations like GDPR, organisations must routinely assess and refresh their cybersecurity policies. This means staying informed about legislative updates, conducting regular audits, and ensuring that employees receive consistent training on the latest best practices.
Having a well-informed team is key to managing these intricate regulations. Hands-on training programmes, such as IT apprenticeships, can provide staff with the expertise to tackle compliance issues effectively while also bolstering the organisation’s overall cybersecurity defences.
What are the benefits of network segmentation, and how does it help protect against cyber threats?
Network segmentation is a powerful strategy to bolster cybersecurity. By breaking a network into smaller, isolated sections, it helps contain potential threats. For instance, if one segment is breached, attackers are far less likely to access the entire system, limiting the damage.
This method also improves control and monitoring. Security teams can implement stricter access rules for sensitive parts of the network, making it easier to spot and address suspicious activity. On top of that, segmentation helps organisations meet data protection regulations by securing critical information and ensuring only authorised access.
Incorporating network segmentation into your IT infrastructure is a smart move to strengthen defences and minimise the risk of large-scale cyber attacks.
