NetworkTigers examines cybersecurity myths that put enterprise networks at risk during upgrades.
You might think you’re following best practices when planning a network upgrade, but some “standards” are actually cybersecurity myths. These false assumptions can lead to breaches, delays, and unexpected costs. Addressing the real risks behind these myths helps build an upgrade that truly strengthens enterprise security.
New hardware is bulletproof
Brand-new switches, routers, and other network appliances are assumed to be secure out of the box. IT teams may skip inspection, thinking the latest hardware has no vulnerabilities. Plugging in unvetted hardware can introduce backdoors or rootkits, letting attackers access your network.
A compromised switch or router at cutover could be a disaster. Even well-known brands have had firmware flaws, so assuming “new = safe” invites breaches. Work with vetted vendors and insist on supply-chain transparency. Verify device authenticity by checking serial numbers against vendor databases before installation. Additionally, implement strict secure-boot and code-signing policies to prevent unauthorized firmware from running.
SD-WAN will solve all security woes
SD-WAN is sometimes viewed as a cure-all for network security or reduced simply to a connectivity solution. Another common misconception is that SD-WAN introduces latency or demands complex security tool management. Treating SD-WAN as inherently secure often leads to misconfigurations.
Neglecting built-in security features or failing to update policies leaves gaps in your design. On the other hand, worrying too much about latency may result in clinging to outdated VPN tunnels and delaying modernization. Choose a secure SD-WAN or SASE platform that integrates next-generation firewalling, intrusion prevention, and centralized policy management.
We don’t need segmentation / zero trust
Assuming that everything behind the corporate firewall or on a trusted VLAN is fully secure is a common mistake. Connecting IoT devices directly and relying on an IPS or audit to protect them introduces serious risk. In reality, any internal device or segment can become a threat. The best practice is to isolate and segment: use VLANs, DMZs, and microsegmentation so that a compromised segment cannot freely pivot to critical assets.
Assuming trust breaks one of the most fundamental controls. A single malware infection or rogue device can traverse the flat network and reach critical assets. Adopt a zero trust mindset: grant least privilege on a per-segment or per-host basis. Additionally, use microsegmentation (software-defined or VLAN-based) to contain traffic.
Encryption is the ultimate defense
Encrypting all LAN and WAN traffic with SSL/TLS is often seen as a way to make a network immune to attacks. However, encryption only protects data confidentiality in transit or at rest. Once an endpoint is compromised, data is decrypted for use, nullifying the benefit of encryption.
Relying solely on encryption can also create blind spots. Attackers with access to a legitimate VPN tunnel or an employee device can move laterally undetected, and your IDS might not inspect encrypted packets. Combine encryption with strong endpoint security, regular patching, and strict access controls. Audit key management practices, rotate keys regularly, and use secure storage such as HSMs or TPMs.
A “silver bullet” solution exists
Depending on a single product or technology to solve all security problems is a common mistake. Believing that a firewall upgrade, a new appliance, or a specific software tool will fully secure the network creates a false sense of security. There is no silver bullet in security; the threat landscape is constantly evolving, and attackers continually adapt. Expecting a one-stop solution can lead to dangerous complacency.
Deploying an expensive next-gen firewall while neglecting patching, user training, or monitoring creates serious risk. If that single control fails or is misconfigured, no backup protections are in place. Strong security requires multiple layers: perimeter firewalls, internal segmentation, endpoint protection, and cloud security. Continuous vulnerability management and security monitoring are critical to catch gaps early.
Security can be bolted on later
Upgrading network infrastructure first and planning to secure it afterward is a common mistake. Security needs to be embedded from day one; treating it as an afterthought allows gaps to persist. For example, launching a cloud VPN without reviewing firewall rules can expose critical applications to security risks. Delaying security also increases the cost and complexity of future fixes, potentially requiring major rework.
Shift security left into the design phase. Conduct a comprehensive network threat assessment before handling any equipment. Develop security requirements alongside performance ones. Use a phased rollout or pilot that includes security testing (e.g., pentests or red-team drills on the new segments). Include rollback plans in case a security flaw is discovered mid-upgrade. Lastly, document configurations and review them in code or config repositories.
Build a future-proof network
Assumptions can be as dangerous as technical vulnerabilities. By focusing on the real risks behind these cybersecurity myths, a network upgrade can become a secure, resilient foundation rather than a future liability. Designing with defense-in-depth, zero trust, and continuous monitoring from the outset ensures stronger protection against evolving threats.
About NetworkTigers
NetworkTigers is the leader in the secondary market for Grade A, seller-refurbished networking equipment. Founded in January 1996 as Andover Consulting Group, which built and re-architected data centers for Fortune 500 firms, NetworkTigers provides consulting and network equipment to global governmental agencies, Fortune 2000, and healthcare companies. www.networktigers.com.
