@hendranata - "Can we claim EX2300 without JNPR?" Answer is YES, although I have no idea what you mean by JNPR. If JNPR is supposed to mean some form of added Juniper Support, then the answer is YES, and this applies to all (95+%) EX Access Layer Switches - EX2200/2300/3300/3400/4200/4300 (T, P, MP, etc.). For EX4000 Series (exception being EX4200/EX4300) and above ELLW (Extended Limited Lifetime Warrenty) does not apply.
The EX Access layer switches are covered by either LLW or ELLW. LLW only applied to older legacy EX Access layer switches purchased prior to Sept 30, 2009. All newer (ELS based) generation of EX Access layer switches, started shipping long after this date, so ELLW applies to all. This includes any/all EX2300/EX3400/EX4300 models (T, P, MP).
So what is ELLW? Basically it is [free - included in price of the switch] HW RMA support. This means for any determined HW failure, Juniper will "next business day ship" a replacement device. This does not quarentee next-day receipt, it is next 'business day' ship. So a reported failure on a late Friday afternoon or evening, may not ship until the following Monday. This is different than ND, which is Next Day ship, via an advanced RMA replacement. In actuallity, if end-user purchases a few extra spare switches, they have for themselves same-day replacement, and can easily live with [free] ELLW HW replacement, which could take a few days for actual receipt of RMA replacement device. This is what the vaste majority of customers do for HW Support for EX Access layer switches.
For details on LLW and ELLW see below which includes within the KB, links to the actual coverage documentation.
https://kb.juniper.net/InfoCenter/index?page=content&id=KB32045&actp=RSS
Now, what does ELLW not cover - TAC/SW support. ELLW is 100% purely HW replacement support, and TAC should not provide any technical assistance to help troubleshoot or assist any other situation. ND (or SD - same day) both include HW support and TAC/SW support, and are therefore sold a higher price point. To cover TAC/SW support Juniper offers CORE support, which provides TAC/SW support at a lower cost than ND/SD. The one "catch" with CORE support is that it requires a minimum of 10 devices to be covered, and all equivalent models the end-user may have, must all be covered; 100% coverage for any model is a requirement.
In your case, at the end of your current contract, if you wanted, you could replace ND with CORE for your EX2300, as long as you have at least 10 to be covered, and that you add coverage for 100% of your purchased EX2300s. CORE functions on a per model basis, so there is CORE support for EX2300, different [price] CORE support for EX3300 and different CORE for EX4300. If you have a mix of EX models, you can not mix models under any CORE support; there is no generic EX Access CORE support.
Please note that with any new Wired Assurance feature/functionality, that when purchased, this includes CORE support for that device. So for EX Access layer switches, ELLW provides HW support, and WA license includes CORE support.
Please also note any/all of this coverage only applies to Juniper devices purchased through a valid Juniper reseller/partner or Juniper Refurbed devices. Devices purchased by any 3rd party or gray market seller, can not purchase or have any level of Juniper Support.
Hopefully this helps all.