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Cybersecurity Services
Network Security · Managed 24/7

Network & Web Security Services in Los Angeles, CA

Your network connects everything — users, devices, servers, and cloud systems. Pro Link Systems secures the perimeter and every connection beyond it: blocking malicious destinations at the DNS layer, managing your firewall, protecting your web presence, and ensuring remote workers connect safely through Zero Trust access.

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Why It Matters

Every connection is a potential attack surface

The network is where threats travel. A phishing link clicked by an employee triggers a DNS request to a malicious domain. Ransomware that lands on one device uses the network to spread laterally to file shares and servers. Remote workers connecting over unprotected home networks expose company resources to whoever else is on that connection. The network layer is both a critical attack surface and one of the most powerful places to stop threats before they cause damage.

Pro Link Systems takes a layered approach to network security. At the DNS layer, Cisco Umbrella blocks connections to malicious destinations before they complete — protecting users whether they're in the office or working remotely. At the perimeter, a managed next-generation firewall enforces policy, blocks intrusions, and inspects traffic in both directions. For internet-facing systems, Cloudflare provides DDoS protection and a web application firewall. And for remote access, we deploy VPN or Zero Trust solutions that verify both the user and the device before granting entry.

Every component is managed by our team — configured, monitored, patched, and tuned continuously. We don't sell you hardware and walk away; we actively manage your network security as a service.

Solutions We Deploy

Network security managed end to end

From DNS filtering to perimeter firewall to remote access, every layer is configured and monitored by our team.

Cisco Umbrella

Cloud-delivered security at the DNS layer. Before any network connection completes, Umbrella checks the destination against threat intelligence and blocks known-malicious and risky websites — stopping phishing pages, malware downloads, and command-and-control traffic before the connection is ever established. Because it operates at the DNS layer, it protects every device on your network as well as remote workers — no additional software required on the endpoint. One of the highest-ROI security controls available.

Protects against
Malicious websites, phishing pages, malware downloads, command-and-control callbacks, off-network threats.

Managed Firewall (NGFW)

A next-generation firewall is your network's front door — inspecting incoming and outgoing traffic, blocking intrusions, and enforcing security policy at the perimeter. Unlike a basic packet filter, an NGFW understands applications, users, and context — making intelligent decisions about what traffic to allow. We configure, monitor, patch, and maintain your firewall as a managed service, so the gateway to your network is never left unguarded or running stale rules.

Protects against
Network intrusions, unauthorized access attempts, malicious inbound and outbound traffic, policy violations.

Cloudflare

Secures and accelerates your internet-facing services. Cloudflare shields websites and applications from denial-of-service attacks and malicious web traffic through a global anycast network and web application firewall (WAF). It also provides fast, secure DNS and DDoS mitigation at a scale that would be impractical to deploy independently. For any business with a public-facing website or application, Cloudflare is a foundational layer.

Protects against
DDoS attacks, web application exploits, DNS tampering, malicious bot traffic.

Secure Remote Access (VPN / Zero Trust)

Remote and distributed staff need a safe, controlled path into company resources. We deploy encrypted VPN or Zero Trust Network Access (ZTNA) depending on your requirements — verifying both the user's identity and the health of the device before granting access, and providing only the access each person needs rather than broad network entry. Zero Trust access is increasingly preferred over traditional VPN because it minimizes blast radius if a credential is compromised.

Protects against
Interception of remote connections, credential-based unauthorized access, over-broad network exposure, compromised remote devices.
Our Approach

Defense from the DNS layer to the perimeter

1

Block at the DNS layer

Cisco Umbrella stops malicious connections before they complete, protecting every user regardless of where they're working.

2

Enforce at the perimeter

A managed next-generation firewall inspects all traffic at the network edge, blocking intrusions and enforcing policy in real time.

3

Protect internet-facing services

Cloudflare absorbs DDoS attacks and filters malicious web traffic before it ever reaches your infrastructure.

4

Secure remote access

VPN and Zero Trust solutions ensure that every remote connection is verified, encrypted, and limited to what each user actually needs.

Common Questions

Network security — answered

DNS filtering works by intercepting DNS queries — the lookup your device makes every time it tries to connect to a website or service — and blocking the connection if the destination is known to be malicious. Because it operates before the connection is established (before any malicious code can download or execute), it stops threats at the earliest possible point. Cisco Umbrella maintains a continuously updated threat intelligence database of malicious domains, IPs, and URLs, and checks every query against it in milliseconds. It's one of the fastest-deploying, highest-value security controls available.
Zero Trust Network Access (ZTNA) is a security model that grants access based on verified identity and device health — rather than network location. Traditional VPN places a trusted user inside the network perimeter, giving broad access once connected. ZTNA grants access to specific applications and resources only, continuously verifying that the user and device meet policy requirements. This limits blast radius significantly: if a credential is compromised, the attacker cannot move laterally across the network. For organizations with remote workforces or distributed cloud environments, ZTNA is increasingly the preferred architecture.
We manage both. For new deployments we can supply, rack, and configure the firewall hardware, or work with your existing equipment. Ongoing management includes policy review and updates, firmware patching, log monitoring, rule cleanup, and responding to alerts. We treat your firewall as a living part of your security program — not a set-it-and-forget-it appliance.
Yes — this is a core use case for both Cisco Umbrella and Zero Trust access. Umbrella's DNS filtering follows users wherever they work by routing their DNS queries through the Umbrella cloud regardless of network. Zero Trust or VPN solutions ensure their connection back to company resources is encrypted and authenticated. Remote and hybrid workforces represent one of the largest attack surfaces for modern businesses, and we design our network security stack specifically to cover them.
A WAF sits in front of your website or web application and filters malicious HTTP/HTTPS traffic before it reaches your server — blocking SQL injection, cross-site scripting, and other common web exploits. If your business has a public-facing website, customer portal, or any web application, a WAF is a standard protection layer. Cloudflare's WAF is one of the most widely deployed in the world and is included in our Cloudflare managed service.