The Cisco Power over Ethernet (PoE) switch allows connectivity to ethernet-powered devices including wireless access points, video cameras, and Cisco IP phones.
Providing PoE
YES
No, the WS-C3550-24-SMI will not support PoE of any type.
The product code Cisco ASA 5520 is associated with the market leading adaptive security appliances delivered by the brand Cisco with reputation for lasting long.
Popular product models of Cisco hubs are the Cisco 1538 Series Micro Hubs. However, Cisco also owns Linksys so most popular Linksys hub models could technically also be regarded as Cisco, like for example the EW5HUB Ethernet Workgroup Hub.
The Cisco Catalyst 6509 falls into the 6500 series switching product line from Cisco. This is a Chassis based layer 3 switch that allows for blade expansions to be added. By itself the Chassis is just an empty shell requiring at least one Power Supply, a and Supervisor Engine. The 6500 product line offers many different line cards ranging from 24 port 10/100 switching blades to 48 port 10/100/1000 PoE blades, or even blades supporting 10GE.
Information can be found on Cisco's website. From the homepage, there is a heading called Products and Services, where all Cisco's current product information can be found. Clicking on that brings you to a page with the heading of Security, where information on the Cisco ASA 5505 is located because it is a firewall.
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The WS-C3550-24-SMI does not support PoE. The WS-C3550-24PWR-SMI supports PoE however. Also note the 3550's are EOL/EOS: (see related link)
Netflow is a Cisco product to analyze network bandwidth usage.
A Cisco 4506 is a computer system that runs Cisco Catalyst. It is one of the mid-ranged models in it's league and is considered to be fairly decent for it's price and what it has to offer.