What is Half Duplex and Full Duplex

Hmmm well let's we learn about Half duplex and full duplex actually we are going to learn the key points also known as useful notes only so this post would be very helpful to you to learn the Duplexes.

Half Duplex

• Half Duplexes running on 10 Mbps speed probably 10BaseT Type of Ethernet.
• In here one can send or one can receive (You can't send or receive at the same time in network)
• Using CSMA/CD (Collision Detection)
• You'll able to see in Walkie-Talkie - using the half duplex method to conversation with destination. once you talk "hello" it should be send to destination probably destination should not able to send at the same time which send "Hello" by a host. after destination got the message from the host "Hello" destination will answer to it "hello"... Simple na..

Full Duplex

• Full Duplexes are running at 100 Mbps speed probably 100BaseTX (UTP and STP) Type of ethernet
• In here you can send and receive at the same time.
• using Free way because there are no data can be collide unless a error. 
• You'll able to see this method on mobile or mobile conversation between host and destination. :D

Router Benefits

• Routers by default breakup broadcast domain and it is helps to connect to WAN (Wide-Area-Network),
• Routers are using something called a serial interface for WAN Connection (V.35 physical interface on a cisco router)

Why we need to breakup broadcast domain?

Breaking up a broadcast domain is very important because now you have to send a "Network Broadcast" to a another host on a network, Some how you have sent the network broadcast to the host in other words every hosts in a network read and process the particular network broadcast message. 

• Routers are not only breaking up the broadcast domain but also collision domain as well. 

2 Main advantages of using a router

• They don't forward broadcast domain by default. 
• They can filter the network based on Layer 3 (We will talk about Layer functions and OSI layers later)

4 Functions of a Router

1. Packet Switching - Router also defined as "layer 3 Switches". use for logical addressing that's why we called as packet switching.
2. Packet Filtering and Internetworking - Router also packet filtering to using access list.when two or more routers in a networks together use logical addressing  (IP -IPV4 Or IPV6 ) What is called Internetwork
3. Path Selection - Routers are using a Routing table (map of the internetwork) to make path selections and forward packets to remote network. 

( I just gave you 3 on the above list but in the 2nd option you'l lsee packet filtering and internetworking, i just combined two options as one)

Maybe You have a Question Like This - How much broadcast needs to a network? 

Actually this is question when i asked in forums when i'm newbie still i'm newbie- I'm taking CCENT so this blog is very helpful to provide the useful notes for your cert exams indeed. so this is the answer,

Always keep in mind - Broadcast domains on how you segmented a network.. 

Network Segmentation?

What is a HUB?

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HUB (Layer 1 of OSI Model)  is a device which helps you to connect a LAN (Local -Area- Network) and it's very inexpensive mostly uses in Home networks and troubleshooting perhaps using in some small offices because of budget summary. Hub is provides 10mbps speed and it has 1 Collision domain and 1 Broadcast domain, Called as "Multi Repeater" too.

A normal Ethernet Hub

This is a Dual Speed Hub We will talk about this later