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CSMA/CD: n Carrier Sense/Multiple Access with Collision Detection (CSMA/CD) When a protocol that uses CSMA/CD has data to transmit, it first senses if a signal is already on the wire (a carrier ), indicating that someone is transmitting currently. That’s the “ Carrier Sense ” part. n If no one else is transmitting, it attempts a transmission and then listens to hear if someone else tried to transmit at the same time. n If someone else transmits at the exact same time, a collision occurs. n Jamming Signal is send to all Stations. Both senders “back off” and don’t transmit until some random period of time has passed. Then they both retry. That’s the “ Collision Detection ” part. n The final part (“ Multiple Access ”) just means that more than one station can be on the network at the same time. n CSMA/CD is the access method used in Ethernet and wireless Ethernet networks.  Collision domain and Broadcast Domain:   Collision Domain: A collision domain is a logical area...

Parts Of Networks: e.g Channels are also referred as Media.We will Discuss it Further. Network Topologies: • Network topology defines the structure of the network. • One part of the topology definition is the physical topology , which is the actual layout of the wire or media. • The other part is the logical topology , which defines how the media is accessed by the hosts for sending data. Physical Topologies:  Normally in Network Star topology is used. Logical Topology:   • The logical topology of a network is how the hosts communicate across the medium. • The two most common types of logical topologies are broadcast and token passing. Logical Topologies Broadcast: • Broadcast topology simply means that each host sends its data to all other hosts on the network medium. • There is no order that the stations must follow to use the network. • It is first come, first serve.Ethernet works this way. Logical Topologies Token Passing: • Token passing controls network a...

The Lecture 1 will Complete 3 or more Post So Dont Worry we will cover everything,1st Lecture will Applicable for Both CCNA and MCITP/MCSE.So Clear Your Concept.You Can Ask any Question in end of the Post(Comment Form).Don't Hasitate to ask any Question: Lets Start From Network :           A network is a collection of computers connected together. NETWORKING :                   is a process of communication between the interconnected devices basically to share the network resources. Benefits of Networking: Share resources.  i) Data                       ii) Hardware Share S/W Sharing of license Network is a collection of computers connected together to get benefited from networking. Types of Networks : Nearly every type of network is a...