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Thank you for the reply. These connection types the above link are talking about are Layer 2. What I want to know is Layer 3. Anyway Thank you.
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Thank you for the reply. These connection types the above link are talking about are Layer 2. What I want to know is Layer 3. Anyway Thank you.

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Expert <br />
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I think ISP should be able to provide several kinds of internet connection service. For example, at the ISP edge router, as long as ISP just provide with its own ip address and a link, which is connected to client’ router, the client can use the NAT at the clients router to access the internet. In the large enterprise, the ISP can provide with whole routing table to client, etc.<br />
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So, any experts can tell me or send a link, which give an overview on all kinds of internet connection service that ISP can provide ? Thank you.
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Expert 

I think ISP should be able to provide several kinds of internet connection service. For example, at the ISP edge router, as long as ISP just provide with its own ip address and a link, which is connected to client’ router, the client can use the NAT at the clients router to access the internet. In the large enterprise, the ISP can provide with whole routing table to client, etc.

So, any experts can tell me or send a link, which give an overview on all kinds of internet connection service that ISP can provide ? Thank you.

What kinds of service can ISP provide for internet connection?

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.

Network Management involves issues that are independent of specific hardware or software, including email policies, upgrade planning, backup scheduling and working with managed service providers for Desktop-As-A-Service (DaaS), Software-As-A-Service (SaaS) and the like through the use of tools, coupled with manufacturer standards, best practice guidelines, policies and procedures plus all other relevant documentation. Network management also includes monitoring, alerting and reporting, management reporting, planning for device or service updates, the backup of configurations, the setting of key performance indicators and measures (KPIs/KPMs), associated service level agreements and problem records as part of the IT Service Management (ITSM) framework.