HUBS SWITCHES ROUTERS

1
HUBS SWITCHES ROUTERS

• CREATED BY ROB CURRY

2
HUBS

• A hub is a small, simple, inexpensive device that
  joins multiple computers together at a low-level
  network protocol layer.
• Most hubs manufactured today support the Ethernet
  standard. A person plugs one end of an Ethernet
  cable into the hub, while the other end of the
  cable runs to the computer's network interface
  card (NIC).
• They can be stackable, nonstackable, managed and
  nonmanaged.

3
SWITCHES

• A switch is a small device that joins multiple
  computers together at a low-level network
  protocol layer. Technically, switches operate at
  layer two (Data Link Layer) of the OSI model.
• Switches look nearly identical to hubs, but a
  switch generally contains more "intelligence"
  (and a slightly higher price tag) than a hub.
  Unlike hubs, switches are capable of inspecting
  the data packets as they are received,
  determining the source and destination device of
  that packet, and forwarding that packet
  appropriately. By delivering messages only to the
  connected device that it was intended for,
  switches conserve network bandwidth and offer
  generally better performance than hubs.

4
ROUTERS

• A router is a physical device that joins multiple
  networks together. Technically, a router is a
  "layer three gateway," meaning that it connects
  networks (as gateways do), and that it operates
  at the network layer (three) of the OSI model.
• The home network typically uses an Internet
  Protocol (IP) router, IP being the most common
  OSI network layer protocol. An IP router such as
  a DSL or cable modem router joins the home's
  local area network (LAN) to the wide-area network
  (WAN) of the Internet.

5
MISC INFO

• When working with the devices mentioned you must
  take into consideration the time to live factor.
• Time to live or TTL is the amount of time an
  individual packet is active before it is erased
  or lost.
• When a packet goes through hubs switches and
  routers its TTL is affected. An example of this
  is a packet can only go through 3 hubs before it
  is lost. Yet if a switch or a router is in the
  network path that packets time to live is
  reverted back to the original TTL.
• Also a maximum of 196 stations can be connected
  to a hub.

6
LINKS

• http//searchnetworking.techtarget.com
• http//handsonhowto.com/lan102.html
• Very indepth look http//www2.edc.org/cope/networ
  kprimer/primch5.pdf