Cisco SMARTnet Introduction
Cisco SMARTnet is a maintenance contract for Cisco hardware and software management. This is provided by Cisco, but is usually sold by an authorized Cisco reseller. In general, the contract lasts for one year, but Cisco offers longer contracts.
Do you need it?
Most Cisco devices run the Cisco IOS operating system, which is continually updated and updated, only two (legitimate) methods for getting updates to the IOS software, one that you buy every time they change, the second is that SMARTnet  Cisco hardware details …
Currently, a category of Cisco Hardware Components is assigned from 1 to 18, The higher the category, the higher the coverage cost. Thus, an 800 Series Router would be Category 1 and 3620 would be Category 7. Unfortunately, this price structure was invented before the arrival of Cisco phones, and although they should be 0.2, there is no category.
Software or hardware and software support only
SMARTnet is available in two formats: "software only" and " hardware and software "; both entitle you to download software updates from Cisco, and hardware and software versions also provide hardware replacement if Cisco agrees that hardware is defective
SMARTnet Base and SMARTnet Onsite
Hardware and Software SMARTnet distributed in two formats, SMARTnet Base and SMARTnet Onsite – both include Advance Replacement of Defective Hardware, but with SMARTnet Base, replacement tools are delivered with normal courier and installed, SMARTnet Onsite will send the engineer to install the hardware. Engineer can bring hardware or arrive by courier service
Advance Replacement is Cisco's replacement product for incorrect hardware, the so-called pre-packaging, because the new hardware is delivered before the wrong hardware is returned.
SMARTnet hardware support is sold for a two-day coverage period, this is the time allowed to qualify for reporting Cisco errors. The lowest coverage is 8 hours a day, 5 days a week or 8×5. If this is not sufficient for your needs, the next available time is 24 hours a day, seven days a week.
The Cisco SMARTnet Hardware contract defines the deadline for hardware. Upon agreement on the exchange requirement, Cisco delivers new hardware from the exact or better configuration you cover within a specified time. The SMARTnet contract offers three types of hardware response time; NBD or the next business day, sometimes referred to as SDS or Same Day Ship, means that your replacement hardware may arrive next business day. If this is too long, there are two options available: 4 or 2 hours. Cisco seeks to provide replacement tools within 2 to 4 hours depending on the contract. Obviously, there are requirements that need to be met before Cisco offers these support levels because not all geographies are eligible. This is simply due to the logic that the same hardware configuration is ready for a local delivery point.
Access to TAC
Cisco TAC (Technical Assistance Center) is the award-winning technical support solution provided by Cisco. TAC centers are strategically located around the world to support the "follow the sun" support solution. This means that at any time, day or night, you will be able to talk to a well trained engineer at Cisco TAC. Additionally, as it provides 24-hour operation to Cisco Support, Cisco provides ongoing assistance in solving critical network problems.