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Networking Fundamentals · Foundational

Internet Service Provider (ISP)

A company that provides Internet access and related services to customers.

Definition

ISPs provide connectivity via DSL, cable, fiber, cellular, fixed wireless or satellite, along with public IP addresses and often DNS and email. Tier 1 ISPs exchange traffic through peering without paying for transit.

Example

A business buys a dedicated 1 Gbps fiber circuit from an ISP.

Exam tip

Problems beyond the demarc belong to the ISP.

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