Target Networking

The blog includes a vivid coverage of the concepts of CCNA, CCNP (Routing & Switching) , Basic Linux and Linux servers. Projects have also been simulated to give a practical exposure.

Thursday, 21 February 2013

Networking Devices Part 1

Posted by Unknown on 00:53 No comments

NETWORKING DEVICES

All but the most basic of networks requires devices to provide connectivity and functionality. These devices are called the NETWORKING DEVICES.
Here we introduce most commonly used networking devices
  1. ETHERNET HUB
  2. MULTISTATION ACCESS UNIT (MSAU)
  3. SWITCHES
  4. BRIDGES
  5. REPEATER
1. ETHERNET HUB :- HUB is a device that connect the multiple ethernet segments, making them act as a single segment.Hubs can also be joined together to create larger networks.
  • Hub will Broadcast the data, it is a simple device that direct data packets to all the devices connected to the hub, regardless of whether the data package is destined for the device.
  • Hub is a layer 1(physical layer) device in OSI MODEL.
  • Hub is use to connect the 2 or more than 2 devices of the same network with in a LAN.
  • Communication will occur in HALF-DUPLAX MODE.
  • Hub uses the twisted-pair cabling to connect devices.
  • Two types of HUB :- 1. Active Hub  2. Passive Hub
ACTIVE HUB :- The HUB which does nothing except provide a pathway for the electrical signals to travel along.
PASSIVE HUB :- The HUB which providing the path for data signals as well as regenerates the siganls before it forwards it to all the connected devices. 

DISADVANTAGES :- 1. Broadcasting  2. collision.

fig. Ethernet HUB

 2. MULTISTATION ACCESS UNIT (MSAU) :- MSAU is a special type of HUB used for the TOKEN RING NETWORKS. 

  • The MSAU performs the token circulation inside the device,, giving the network a physical star appearance.
  • Each MSAU device has a Ring In (RI) port on the device, which is connected to the Ring Out (RO) port of another MSAU.
  • The last MSAU is connected to the first to complete the ring.  

fig. Multistation Access Unit

3. SWITCHES :- Like HUB, SWITCHES are used to connect the two or more than two computers.
  • Switch sends the data on the behalf of the MAC Address.
  • Switch is a layer 2 (Data-Link layer) device in OSI MODEL.
  • Switch work on FULL-DUPLAX MODE.
  • In ASIC chip MAC TABLE is created.
  • If MAC Address is not match with mac table entries then it BROADCAST the data, Like HUB.
  • There is no collusion in switch.
  • Devices are connected to Switch through Twisted-Pair cable.
  • Types of Switches :- 1. Manageable switch  2. Unmanageable switch.
MANAGEABLE SWITCH :- The Switch which can be manageable or configure. Today all the Switches are manageable.
UNMANAGEABLE SWITCH :- The Switch which can not be manageable. These types of Switches are always PLUG & PLAY.
fig. 24 port switch 

4. BRIDGES :- Bridges are used to divide the larger networks into smaller networks.They do this by sitting between the two physical network segments and managing the flow of data between the two.By looking at the MAC Address of the devices connected to each segment, bridge can elect to forward the data or block it from crossing.
  • Bridges can also be used to connect the two physical LANs into a larger logical LAN.
  • Bridge is a layer 2 (Data-Link layer) device in OSI MODEL.
  • Types of Bridge in network :- 1. Transparent Bridge 2. Source Route Bridge 3. Translational Bridge.

fig. Bridge network
5. REPEATER :- Repeater is a device which amplifies or regenerate digital signals received while sending from one part of network into another.

  • Repeater is a layer 1(Physical layer) device in OSI MODEL.
fig. Repeater
Made by P & V

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