layer 3 switches require ip address but hub do not require
Layer 1 (hubs) or Layer 2 (bridges or switches) devices.
switches
By additional hubs, switches, or devices such as printers, servers, computers, or etc.
distributed backbone
Hubs segregate packets because hubs are used as switches. Through a VLAN, hubs, when used as switches, can easily segregate incoming and outgoing traffic.
Straight through cables can be used to connect devices together via switches, hubs, routers, bridges.
Hubs and Switches
Switches increase the number of collision domains in the network.
As soon as possible. Switches are much more efficient than hubs because hubs send the data to all the connect nodes, unlike switches that only forward packets to the appropriate node. Hubs cause a lot of packet collisions which reduces the efficiency of your network. __________________ I was going to say "Now, because switches are so cheap". But your answer is better.
Switches are generally considered layer 2 devices, but many are capable of operating at layers 3, 4 or higher. Most hubs are amplifying the electrical signal; therefore, they are really repeaters with several ports. Hubs and repeaters are Layer 1 (physical layer) devices.
There is no magazine that is specific to network hubs and switches. However, PC Magazine is a computer magazine available on newsstands and MozillaQuest (http://mozillaquest.com/index.html) is an online magazine that may include articles and other information on network hubs and switches.
Please see:What_is_the_difference_between_a_hub_and_a_switch