ABtalk

MAC stands for media access control. MAC address is also known as physical address or hardware address or BIA(burnt-in-address).BIA is generally written in Cisco router switches.physical address is generally written in laptop/pc.MAC address is generally written in Mobile. MAC address is globally unic.The MAC address of a device is different from other devices.Many people are thinking there is only one mac address of a device but it is actually wrong ,Because there is no mac address of a laptop .There is a Mac address of your NIC(network interface controller) ,which is connected to your laptop .                                (NIC) If you change your NIC,then the Mac address of your laptop will be changed.NIC is a separate hardware component present in your computer used to connect with the network (home network or internet).There are so many ways that you can connect your laptop with the network like...

   HTTP:- -Http stands for hypertext transfer   protocol. -It is an application layer protocol. -The http is a set of rules for exchanging  files(text, graphics,video, record,images  and other multimedia files) on the   Www(world wide web). -It is an access method to access web   pages used on the internet . -Http is a part of protocol framework   called the internet protocol suite ,which   includes TCP/IP . -Http uses port number 80. Components of Http based system:- Http is a client server protocol , requests are send by one entity,the web user agent.Most of the time the user agent is a web browser. Generally 3 components are in http based based system.Like client, server and proxy . Client and server:- A server is a computing program or device that accepts and responds to requests made over a network.The device the sends request to the server and get response from the s...

Computer Network A computer network is a system in which multiple devices are connected to each other to share information and resources. Types of communication:- (I)Unicast:- One to one communication between two devices in a network Known as Unicast.In this type of communication,there is only one sender and also one receiver . (II) Multicast:- Multicast happens when one user sends message to multiple users at the same time.In this case,there is only one sender and multiple receivers. (III) Broadcast:- Broadcast happens when one user is sending message to all users connected or in range .In this case ,there is one sender and all others are receivers. Let's understand with an suitable example:- -In Unicast transmission,John is sending   information and Sohail is receiving the   information.so,there is one sender and   one receiver. -In multicast transmission,Hari is sending  ...

POP3:- -POP3 stands for post office protocol   version 3. -It is a simple protocol with limited   functionality which is used for opening   remote e-mail boxes. -It is a pull protocol. -It is an application layer protocol. -A POP3 sever stores message for each   user until the user logs in using e-mail   client and downloads the message to   their  computer.Once the the message is   downloaded ,it(message) is deleted from   the server. -In POP3,you can access mail from a   single device.once you have downloaded   the mail to your desktop after it you can't   download the same message to your   laptop because the mail had deleted after   first download. -The transfer protocol of POP3 is   TCP(Transmission control protocol).Post   office protocol version 3 uses TCP for   communication and It uses T...