Network Design Management( 12 Sep. 2012 )




IP : 203.81.192../19
32-19=13 host bits
Turn all host bits on you will get broadcast address
203.81.223.225

Apply AND operation between IP and subnet mask you will get network id
IP AND Subnet mask = Network id

 

Hub - broadcast, collision

                         An Ethernet hub, active hub, network hub, repeater hub, multiport repeater or hub is a device for connecting multiple Ethernet devices together and making them act as a single network segment. It has multiple input/output (I/O) ports, in which a signal introduced at the input of any port appears at the output of every port except the original incoming. A hub works at the physical layer (layer 1) of the OSI model.[1] The device is a form of multiport repeater. Repeater hubs also participate in collision detection, forwarding a jam signal to all ports if it detects a collision.



Switch –

                  A network switch or switching hub is a computer networking device that connects network segments or network devices. The term commonly refers to a multi-port network bridge that processes and routes data at the data link layer (layer 2) of the OSI model. Switches that additionally process data at the network layer (layer 3) and above are often referred to as layer-3 switches or multilayer switches.

The first Ethernet switch was introduced by Kalpana in 1990.


Router – saves network ids

              A router is a device that forwards data packets between computer networks, creating an overlay internetwork. A router is connected to two or more data lines from different networks. When a data packet comes in on one of the lines, the router reads the address information in the packet to determine its ultimate destination. Then, using information in its routing table or routing policy, it directs the packet to the next network on its journey. Routers perform the "traffic directing" functions on the Internet. A data packet is typically forwarded from one router to another through the networks that constitute the internetwork until it gets to its destination node

·         CSMA/CD : Carrier sense multiple
·         ASIC  Chip



There are three ways to access a router
·         Console access 
·         AUX access
·         Remote access
iOS : internetwork operating system




Live IP / WAN IP
Local IP / LAN IP


Websites to check live IP

www.Ipchicken.com
www.Whatismyip.com


CISCO Switches


  • ·          2950
  • ·         2960
  • ·         2960G
  • ·         3750

Routers


  • ·         7200
  • ·         7206

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