COMPUTERS -- TIERS

COMPUTERS  --  TIERS

One tier is called standard service.

There is ni proper definition to tire.

“A net work that can reach other network on the internet

without purchasing IP transit or paying settlements.”

Is called tier.

The original internet backbone is ARPANET. It provides routing between most  participating net works.

This was replaced by NSFNET in 1989. It was govt. sponsored, terminated o 30-04-1995.

1   TIER :-

TIER -1 IS INTERNET SERVICE PROVIDERS.

1-tier network does not pay settlement.

To become 1-tier net work,. A net work must peer with every net work of tier-1.

All transit free net works are 1-tier.

Transit free net works;

            1]         renesys corporation

            2]         RIPE.RIS.data base

            3]         oregon route views

This 1-tier network is used in the industry to mean a network with no overt settlements.

It is closer to centre of internet.

It cannot reach most ead users.

Good quality network.

It cannot be free globally.

AT & T,     GBLX,     L3,   NIT Communication.

Remote network management

24X7 trouble assistance

2   TIER :-

TIER – 2 ARE PROTECTED SERVICES.

They can have redundant interconnections with more than  one tier-1 provider.

It can reach more end users.

It is larger than tier-1.

It is more better connectivity.

It is internet service provider.

It purchases IP transmit to reach others.

Virtual private network

Filtering routers and firewalls

Intrusion detection

Boundary anti-virus detection

Optional  network management

3   TIER :-

TIER – 3    IS HIGH ASSURAQNCE SERVICE.

These are true resellers = tier – 2

Not successful because of depeering.

It is not multihomes.

Visigenic/noblenet

3-tier architecture is most commonly used to build web applications.

Virtual private network

Encryption capable backbone

Filtering routers and firewalls

Trusted gateways and secure mail guards

Intrusion detection

4   TIER :-

4 – TIER   NETWORK HIGH SERVICE

No connection to lesser sensitive network

Boundary virus det.

On-site network management

N.   TIER :-

It begins as a 3-tier model and expanded.

Finer granularity

Credit card authorization

Shipping costs/sales tax/business logic tier