The Cisco 6506 switch is slightly different from the Cisco 6506-E switch in functionality. The Cisco 6506-E switch has a few more functions, such as a different Firewall and support for IPSec VPN systems..
Technology wise there is no such difference.
The company Cisco sells their switches directly. The Cisco website has links to where one can purchase Cisco switches. Alternatively, Cisco switches can be purchased second-hand from online retailers such as Ebay.
Like Cisco routers, most Cisco switches run IOS, and can be configured in a similar way. Older non-IOS switches still use the console port to configure them, just like the routers.
CISCO is widely known for its networking hardware products such as routers, modems, and switches. Some of CISCO's other hardware products are blade server switches, data center switches, and optical networking hardware.
SSL (Secure Socket Layer,) is a protocol. Most Cisco VPNs will use SSL as their security protocol, so there is no difference between Cisco VPN and SSL VPN.
If someone is looking to buy Cisco Catalyst switches, they may start by looking at Cisco's online catalog on their website. If Cisco doesn't have the selection the person is looking for, they may also check out Office Depot's website.
Unix is the name of an Operating System (software) and Cisco is the name of a technology company.
One can purchase Cisco 6500 switches when one goes to the official website of Cisco. One can also purchase from other sites like Vista, Amazon, and eBay, etc.
routers and switches
Cisco Systems is a company that develops, manufactures and sells hardware for computer networking. The Cisco 3560 is a line of Ethernet switches offered by the Cisco brand.
Cisco IOS (originally Internetwork Operating System) is the software used on the vast majority of Cisco Systems routers and current Cisco network switches. (Earlier switches ran CatOS.) IOS is a package of routing, switching, internetworking and telecommunications functions tightly integrated with a multitasking operating system.
PDA North and TC Digital buy and sell new and used Cisco 3750G switches. One can purchase new Cisco equipment directly from the Cisco website as well.