Comcast Business vs Zayo: Which ISP Is Better?

If you're sourcing enterprise internet, you've likely come across Comcast Business and Zayo. Both are major providers, but they serve different business needs with distinct network strengths.

To help you find the better fit for your company, we're comparing the two head-to-head. Our analysis is built on proprietary data from over 70,000 aggregated ISP quotes, covering key benchmarks like pricing, installation timelines, and service availability.

You can continue reading for our detailed breakdown. If you're ready to see your specific options, begin our questionnaire to receive real-time quotes from top providers.

Overview of Comcast Business

Founded in 1963, Comcast is a major player in the telecommunications industry. Headquartered in Philadelphia, Pennsylvania, the company employs 190,000 people and ranks 33rd on the Fortune 500 list, with its business services focused primarily in the United States.

Comcast Business provides connectivity and security solutions for organizations ranging from small businesses to large enterprises. Some of their notable offerings include a 5-year price lock guarantee on certain service bundles.

They also offer innovations like a firewall that is integrated directly into the business's network connection, removing the need for extra hardware.

Overview of Zayo

Founded in 2007, Zayo is headquartered in Boulder, Colorado. The company has approximately 3,500 employees and operates in 35 countries, though it is not a Fortune 500 company.

Zayo's approach centers on modernizing network infrastructure and moving away from older technologies. A key part of their strategy is simplifying network management through automation and self-service platforms, such as their Network-as-a-Service (NaaS) experience.

ISP Products

Dedicated Internet (DIA)

Comcast's Ethernet Dedicated Internet (EDI) offers a broad range of speeds from 10 Mbps to 100 Gbps, delivered over a mix of fiber, coax, and HFC. In contrast, Zayo's Dedicated Internet Access focuses purely on fiber, with speeds starting at 100 Mbps. This difference in transport technology is a key distinction, as Comcast can often deliver to the suite while Zayo typically terminates at the building's main point of entry (MPOE).

Based on our data, Comcast's 100 Mbps DIA circuits are about 15% more affordable than the market average, while Zayo's are about 7% more expensive. At the 1 Gbps speed tier, both providers are priced very close to the market average. Installation timelines for both are slightly longer than the 77-day industry average, with Comcast at 82 days and Zayo at 89 days. For service guarantees, Comcast provides a standard 99.99% uptime SLA, whereas Zayo's approach is more customized with specific SLAs detailed in individual service agreements.

It's important to remember that these are aggregate figures. Installation times and pricing can vary significantly based on your region and the specific DIA configuration you need.

For an exact comparison of Comcast Business, Zayo, and other top ISPs for your area, fill out our questionnaire. It's built on the most comprehensive data set in the industry, giving you accurate, real-time information for your specific locations.

DIA Pricing, Delivery and Install Days Compared

The data in this table comes from Lightyear’s aggregated ISP quotes collected in 2024 and 2025 YTD.

• Install Days: how long it typically takes to deliver service.
• 100Mb Price vs Avg / 1Gb Price vs Avg: shows whether this ISP is cheaper or more expensive than the market average.
• Delivery Point: “Suite” means the ISP delivers service all the way to the company’s server room; “MPOE” means the circuit stops at the building’s minimum point of entry (typically the building's utility basement) and the tenant must handle the inside wiring.

Wireless

Comcast Business provides a mobile wireless service through its xfinity mobile product. This service operates on Verizon's extensive 5G network and is supplemented by Comcast's own network of WiFi hotspots, offering both LTE and 5G plans for business phones and devices.

Zayo takes a different approach and does not sell retail wireless services like LTE, 5G, or fixed wireless broadband directly to businesses. Instead, Zayo functions as an infrastructure provider, supplying the critical fiber backhaul and connectivity that wireless carriers need to run their mobile networks.

Security

Comcast Business offers a wide array of security products. For general protection, their SecurityEdge service acts as a first line of defense against common cyberthreats. For larger organizations, Comcast provides a Managed Security suite that includes Managed VPN, Unified Threat Management (UTM), managed firewalls, and network-based DDoS protection.

Zayo’s security offerings are more focused, specializing in DDoS Protection. Their service provides network-based monitoring and mitigation at the edge of their network, with proactive detection and scrubbing of malicious traffic. This protection is available in Basic, Standard, and Advanced tiers, with higher tiers offering portal access for more visibility.

Ultimately, the choice comes down to your specific needs. Comcast aims to be a comprehensive security partner with a broad portfolio, while Zayo provides a specialized, high-performance DDoS mitigation service integrated with its network.

Broadband

Comcast’s broadband service, delivered over a Hybrid Fiber Coax (HFC) network, offers asymmetrical speeds up to 1.25 Gbps download. This service includes a 1.2 TB monthly data cap and a 99.99% uptime SLA. Our data shows Comcast's broadband is priced about 33% higher than the market average, with installations taking approximately 31 days versus the 28-day industry average.

Zayo does not offer a mass-market broadband service in the same way as Comcast; their offering aligns more with their fiber-based Dedicated Internet product. Due to limited quoting history for this service, we’re not able to provide benchmark pricing or installation timelines at this time. To find Zayo's latest pricing for your locations, you can get a new quote through our questionnaire.

Ethernet

Zayo specializes in carrier-grade Ethernet services, including Ethernet Private Line (EPL), EVPL, and E-LAN. These Layer 2 services are designed to connect multiple business locations over their high-capacity optical network, creating a private, secure network across different sites. Their offerings are MEF-certified, which is a key standard for performance and reliability in enterprise networking.

Comcast’s more common offering is their business broadband service, delivered over a Hybrid Fiber Coax (HFC) network with asymmetrical speeds and a monthly data cap. The distinction is important for buyers: Zayo provides dedicated Layer 2 connectivity ideal for building a private WAN, while Comcast’s widely available service is a shared internet connection. For a comparable Layer 2 service from Comcast, you would look to their Ethernet Dedicated Internet (EDI) product.

POTS Replacement

Comcast offers a POTS replacement solution through its Business Voice service, with basic lines designed for specialty equipment like fax machines, alarm systems, and point-of-sale devices. Their voice network aligns with NFPA 72 performance criteria for fire alarm systems and includes a 5-hour battery backup and optional LTE failover for reliability.

Zayo does not provide a native, first-party POTS replacement product. The company's focus is on core network infrastructure, such as IP/data transport and voice SIP trunking, rather than a branded, on-site device for replacing traditional phone lines.

For businesses seeking a direct replacement, Comcast provides a packaged solution, though it requires Comcast Business Internet to avoid certain fees. Zayo, in contrast, operates at the infrastructure layer, providing the underlying connectivity that other voice services might run on.

Other Key Features Compared

Geographic Coverage

Comcast Business focuses its services exclusively within the United States.

While they are a massive provider, their network is concentrated on serving American businesses, from small companies to large enterprises across the country.

Zayo, on the other hand, has a much broader international presence.

Their network spans across 35 countries, offering connectivity options for businesses with a global reach.

SLA

Comcast Business offers a standard 99.99% uptime Service Level Agreement (SLA) for its DIA and broadband services. This is a promise that your connection will be working for all but a few minutes per month.

Zayo takes a more tailored approach. Their SLAs are customized and detailed within each individual service agreement, which can offer more flexibility depending on your business's specific requirements.

For you, these SLAs are a safety net. If your service goes down, the agreement outlines how quickly the provider must fix it and what credits you may receive on your bill for the downtime.

Transport Types Available

Comcast Business uses a mix of fiber, coax, and HFC across its 200,000 fiber route miles. This allows them to offer a wide variety of speeds, from basic broadband for everyday tasks to multi-gigabit connections for heavy business use.

Zayo operates a 144,000-mile network that is exclusively fiber. This focus means they specialize in providing high-capacity, symmetrical speeds ideal for data-intensive operations.

Essentially, Comcast's network is built to serve a wide spectrum of customers with different needs. Zayo's all-fiber infrastructure is designed for businesses that need consistent, high-performance connectivity for critical applications.

Customer Support

Comcast Business provides support through large call centers and online portals. Since they serve millions of customers, you will likely interact with a tiered support system for assistance.

Zayo generally offers a more direct support experience. Customers often work with a dedicated account manager or a specialized team familiar with their specific network configuration.

The right fit depends on your preference: access to a broad support network with Comcast, or a more personal, focused relationship with Zayo's team.

Final Verdict: Comcast Business or Zayo?

Choosing between Comcast Business and Zayo comes down to your company's specific needs. Comcast offers a wide portfolio of services over a mixed network, while Zayo focuses on providing high-capacity, fiber-only connectivity.

Comcast is often a strong choice for US-based businesses that want a single provider for internet, security, and voice. Their ability to deliver service directly to the suite can also simplify installation for many organizations.

In contrast, Zayo is better suited for companies with a global presence or those requiring carrier-grade Ethernet for a private WAN. Their all-fiber network is built for high-performance, data-intensive operations.

Ultimately, the right provider depends on your priorities—whether you need a broad service package or specialized, high-capacity fiber infrastructure.

To make your decision a little easier, here’s a quick side-by-side look at how Comcast Business and Zayo stack up on the key points we've covered.

Choose the Right ISP Today With Lightyear

Making the right choice between a versatile provider like Comcast Business and a fiber specialist like Zayo starts with a clear picture of your own needs. Once you have your requirements mapped out, the next step is gathering and comparing your options—a process our software was built to simplify.

Lightyear gives you the data and tools to find the right provider at the right price, without the back-and-forth of traditional procurement. Here’s how we help:

• Automated ISP Procurement: Compare quotes from providers like Comcast, Zayo, and others side-by-side, using the industry's largest pricing dataset to benchmark your rates.
• Transparent Pricing & Negotiation: We proactively negotiate quotes down if they don't align with market data, so you know you're not overpaying.
• Service Breadth Across All ISPs: Find all the connectivity you need in one place, whether it's DIA, broadband, wireless, or colocation.

If you're ready to move past spreadsheets and endless sales calls, we can help you procure and manage your network with confidence. To see how Lightyear can simplify your telecom procurement from start to finish, schedule a demo with our team.