Recommand two type of switchs...

I am gona buy workgroup switchs in 3days..I am confusing to choose ones.
The followings are required.
<<SWITCH 1>>
(packets switching over 38.7Mbps).
1.24ports.
2.FabricSwitch Bandwidth: 28Gbps
3.supporting 10/100/1000 Mbps Ethernet ports each(over 24 ports).
4.supporting 2GIBC ports( over 2 ports).
5. supporting 16MB Flash, 128MB DRAM.
6. Supporting Dynamic VLAN and Voice Vlan.
7. Supporting PVST+ and IGMPv3 snooping.
8. supporting Radius and TACACS+ Authentication.
<<SWITCH 2>>
(packets switching over 10.1Mbps).
1.48ports
2.FabricSwitch Bandwidth 13.6Gbps.
3. over 48 10/100 Ethernet ports
4. over 2 GIBC ports
5. 8MB Flash, 16MB DRAM
6. IEEE 802.1W(RSTP) and IEEE 802.1S(MSTP)
7. Supporting IEEE802.1x authentication.
8. Supporting traffic controling base on TCP&UDP and MAC.
Could U recommand me any switchs please........

I think you came to the wrong forum for this question.
This group deals with content networking - in other words loadbalancing, caching,...
so we deal with CSS,CSM,Cache Engine, WCCP, ...
There is a lan-switching forum which would be more appropriate for this question.
Gilles.

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Select some text and then set the SelectionFont property for each selection, e.g.:
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Please remember to close your threads by marking helpful posts as answer and then start a new thread if you have a new question.

CiscoWorks user options "device type groups|switch and Hubs"

Hi,
We are using CiscoWorks software to deploy new configuration to our network devices. Because our environnement is mixed about version of network devices we have to create a new netconfig job for each device model, because in some plate-forme configuration option, syntax maybe different of each other.
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Here,
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Are there two type of associations between objects or are there just different representations?

I've been spending some time on 're-tuning' some of my OOP understanding, and I've come up against a concept that is confusing me.
Lets say I have two objects. A user object
and an account object.
Back to basics here, but each object has state, behaviour and identity (often referred to as an entity object).
The user object
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The account object
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which would make it inactive. It returns if checks pass, or throws exception if not.
Now here lies my problem. There is clearly a relationship between user and account,
but I feel that there are actually two TYPES of association to consider. One that is data driven (exists only in the data/state of the objects and the database) and one that is behaviour driven (represents an object call to methods of the associated object).
Data Driven Association
In the example I have presented, there is clearly a data association between user and account.
In a database schema we could have the following table:
USER_ACCOUNTS
id
user_id
When we instantiate the account and
load the database data into it, there will be a class variable containing user_id.
In essence, the account object
holds an integer representation of user through user_id
Behaviour Driven Association
Behaviour driven associations are really the dependencies of an object. If object A calls methods on object B there is an association going from A to B. A holds an object representation of B.
In my example case, neither the user object
nor the account object
depend on each other to perform their tasks i.e. neither object calls methods on the other object. There is therefore no behaviour driven association between the two and neither object holds an object reference to the other.
Question
Is the case I presented purely a case of entity representation? The association between user and account is
always present, but its being represented in different ways?
ie. the user entity
has an identity that can be represented in different forms. It can be represented as an object (the instantiated user object)
or as a unique integer from the users table in the databases.
Is this a formalised way of recognising different implementations of associations or have I completely lost my mind?
One thing that bugs me is how would I describe the differences in UML or similar? Or is it just an implementation detail?

It s a bit hard to fully understand what is problem actually in :). I think you are a bit mixing some concepts.
Entities representation
At first, all models we are implementing is just a simplification of some real-world objects and environment. Your conceptual entity user corresponds to some real user and contains some attributes we are intresteing in according to application needs. Thus there
are some models we have to implement.
Thus, all user defined by DB schema, user defined by class, and probably user defined by some presentation logic is normally present some real-world user. It is only about implementation purposes, we have to store, view and manipulate with user.
On the other hand let's take a look on Single Responsibility Principle. It tells us to use every class or program unit just for certain needs. Using single user (class or program unit) for storage and presentation needs violates this principles.
the user entity has an identity that can be represented in different forms. It can be represented as an object (the instantiated user object) or as a unique integer from the users table in the
databases.
So, the answer is yes.
Associations and dependencies
I think it is more about terminology than about nature of problem. But in general you are right - there are different types of object realtions (especially, I will use other terms to list it). For example "referencing", "creation", "using",
"coordinating", "storing", "inheriting" (!) ....
According to this, user instance references account instance. And A instance uses B instance.
For most cases it is good enough to distinguish just "referencing" and "using". It is what you've just written. It's enough common and abstract to be understood by other person when talking about domain, e.g.
But sometimes, to emphasize some aspects you should describe relations in a way like "A dispatches ensemble of Bs" or "R stores X to database". It's more applicable for specification and modelling.
Is this a formalised way of recognising different implementations of associations or have I completely lost my mind?
To call something formalized I suggest to look at UML.
UML and other modelling instruments
One thing that bugs me is how would I describe the differences in UML or similar? Or is it just an implementation detail?
There are a lot of UML models (diagrams). Let's take a look at most well-known - Classes and Objects Diagram.
It's interesting that UML allows to present all type of object relations, and moreover allows to decide "is it just an implementation detail".
Martin Fowler describes 3 levels (or point of views) of understanding of Classes Diagram.
Conceptual. Diagram is considered as high-level domain model, independent from implementation.
Specification. Diagram is considered as high-level realization model containing of interfaces.
Implementation. Diagram is considered as low-level technical paper containing interfaces, classes, references, other types of relations.
Is this a formalised way of recognising different implementations of associations or have I completely lost my mind?
Yes, you have to fix some point of view and choose appropriate relations set.
For example, let's take a look at Classes Diagram and consider it from an implementation point of view. UML defines 3 type of relations (and propose corresponding means to its designation):
Association
Association corresponds "referencing" between instances.
Dependency
Dependency combines all types of relations such as "using", "creating", "storing", etc.
Inheritance.
Inheritances as a fundamental OOP instrument is presented by UML in a distinct way. It's more about classes than about instances, but also one can say that A instance inherit attributes of B instance. So, that's ok.
First and second points of view on Class Diagram, as I remember uses only one type of relation unifying both associations and dependencies and is designated like association (no inheritance, of course).
Also, UML proposes Objects Diagram which is same to Classes Diagram, but fits better for runtime modelling needs.
Finally, a choice of a set of relations taken into consideration depends on a context and point of view. UML provides some ones.

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QUEUE      MSG_STATE      COUNT(*)
DST1_Q     READY           100
SRC1_Q     PROCESSED       100
Edited by: i.k. on 10.05.2011 10:49
Edited by: i.k. on 10.05.2011 10:50

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Attachments:
patch_six.vi ‏25 KB

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thanks a lot.

Hi Angel,
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