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
