Basic Terms for Internet


Like millions of people on the world, as a network engineer we are also using Internet. But a little different from other people, we also need to know some common terms of our main working area, Internet. Let’s begin and see what are these Internet related terms that we will use for our Nokia at NRS certification course.

Network Protocol : A standard method of communication netween computers.

TCP/IP : Transmission Control Protocol / Internet Protocol. One of the main protocol of computer networks.

Internet: The worldwide system of linked computer neworks operated by Internet Service Providers(ISPs) that is capable of exchanging data through a standard addressing and naming system based on TCP/IP protocol .

Internet Service Provider (ISP): An organization or a company that has its own network and provide internet access to its customers ( End users or companies) .

Peering : An arrangement between two or more ISPs that provides customer traffic excahnge each other.

Service Provider Tiers: There are different scale of Service Providers. Simply we can divide this 3 ategory.

Tier 1 : The biggest and the main Service Providers. Tier 1 Service Provider’s need to be peer each other . They do not purchase information transit from other networks.

Tier 2 : The medium Service Providers that purchase transit services from the other Tier 1 Service Providers, one or more.

Tier 3 : The small Service Providers that purchase transit servies from other Tier 1 or Tier 2 services. This can be like reselling of Tier 2 Service Provider services.

SLA (Service Level Aggriment) : A written quality and service level dial with Service Provider and the customer.According to these obligations, ISP provide services to the subscribers.


Residental Subscriber : End-User, a single Internet user and customer of ISPs. Basicall a home user.
Enterprise Subscriber : Companies that purchase Internet services from Service Providers and connect thier branches that are at different locations.


Here, there are two important point that needs to be mentioned. For Residental Subscribers, Service Providers do not need to assign more resource. But for Enterprise Subscribers, more resource are needed, because there can be many users and locations. According to SLAs(Service Level Aggriment) that mentins these service levels and quality , ISPs provide services.

Lesson tags: internet terms
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