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According to the protocols involved, networks interconnection is achieved using one or several of the following devices: →Bridge: a computer or device that links two similar LANs based on the same protocol. →Router: a communication computer that connects different types of networks. Basic of Networking A computer network consists of a collection of computers, printers and other equipment that is connected together so that they can communicate with each other. Fig 1 gives an example of a network in a school comprising of a local area network or LAN connecting computers with each other, the internet, and various servers. Take advantage of this course called Basic Computer course book download to improve your Others skills and better understand computer basic. This course is adapted to your level as well as all computer basic pdf courses to better enrich your knowledge. All you need to do is download the training document, open it and start learning computer basic for free. But if three computers want to send data at the same time, each computer will send one packet and then wait while the other two computers send packets. After each of the other computers sends a packet, the first computer will send its next packet. This way the computers are sharing access to the network. Aug 08, 2017 Computer Network: It is the interconnection of multiple devices, generally termed as Hosts connected using multiple paths for the purpose of sending/receiving data or media. There are also multiple devices or mediums which helps in the communication between two different devices which are known as Network devices.
Open system:
A system which is connected to the network and is ready for communication.
A system which is connected to the network and is ready for communication.
Closed system:
A system which is not connected to the network and can’t be communicated with.
A system which is not connected to the network and can’t be communicated with.
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Computer Network:
It is the interconnection of multiple devices, generally termed as Hosts connected using multiple paths for the purpose of sending/receiving data or media.
There are also multiple devices or mediums which helps in the communication between two different devices which are known as Network devices. Ex: Router, Switch, Hub, Bridge.
It is the interconnection of multiple devices, generally termed as Hosts connected using multiple paths for the purpose of sending/receiving data or media.
There are also multiple devices or mediums which helps in the communication between two different devices which are known as Network devices. Ex: Router, Switch, Hub, Bridge.
The layout pattern using which devices are interconnected is called as network topology. Such as Bus, Star, Mesh, Ring, Daisy chain.
OSI:
OSI stands for Open Systems Interconnection. It is a reference model that specifies standards for communications protocols and also the functionalities of each layer.
OSI stands for Open Systems Interconnection. It is a reference model that specifies standards for communications protocols and also the functionalities of each layer.
Protocol:
A protocol is the set of rules or algorithms which define the way how two entities can communicate across the network and there exists different protocol defined at each layer of the OSI model. Few of such protocols are TCP, IP, UDP, ARP, DHCP, FTP and so on.
A protocol is the set of rules or algorithms which define the way how two entities can communicate across the network and there exists different protocol defined at each layer of the OSI model. Few of such protocols are TCP, IP, UDP, ARP, DHCP, FTP and so on.
UNIQUE IDENTIFIERS OF NETWORK
Host name:
Each device in the network is associated with a unique device name known as Hostname.
Type “hostname” in the command prompt and press ‘Enter’, this displays the hostname of your machine.
Host name:
Each device in the network is associated with a unique device name known as Hostname.
Type “hostname” in the command prompt and press ‘Enter’, this displays the hostname of your machine.
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IP Address (Internet Protocol address):
Also, known as the Logical Address, is the network address of the system across the network.
To identify each device in the world-wide-web, Internet Assigned Numbers Authority (IANA) assigns IPV4 (Version 4) address as a unique identifier for each device on the Internet.
Length of the IP address is 32-bits. (Hence we have 232 IP addresses available.)
Type “ipconfig” in the command prompt and press ‘Enter’, this gives us the IP address of the device.
Also, known as the Logical Address, is the network address of the system across the network.
To identify each device in the world-wide-web, Internet Assigned Numbers Authority (IANA) assigns IPV4 (Version 4) address as a unique identifier for each device on the Internet.
Length of the IP address is 32-bits. (Hence we have 232 IP addresses available.)
Type “ipconfig” in the command prompt and press ‘Enter’, this gives us the IP address of the device.
MAC Address (Media Access Control address):
Also known as physical address, is the unique identifier of each host and is associated with the NIC (Network Interface Card).
MAC address is assigned to the NIC at the time of manufacturing.
Length of the MAC address is : 12-nibble/ 6 bytes/ 48 bits
Type “ipconfig/all” in the command prompt and press ‘Enter’, this gives us the MAC address.
Also known as physical address, is the unique identifier of each host and is associated with the NIC (Network Interface Card).
MAC address is assigned to the NIC at the time of manufacturing.
Length of the MAC address is : 12-nibble/ 6 bytes/ 48 bits
Type “ipconfig/all” in the command prompt and press ‘Enter’, this gives us the MAC address.
Port:
Port can be referred as a logical channel through which data can be sent/received to an application. Any host may have multiple applications running, and each of this application is identified using the port number on which they are running.
Port number is a 16-bit integer, hence we have 216 ports available which are categorized as shown below:
Port can be referred as a logical channel through which data can be sent/received to an application. Any host may have multiple applications running, and each of this application is identified using the port number on which they are running.
Port number is a 16-bit integer, hence we have 216 ports available which are categorized as shown below:
Port Types | Range |
---|---|
Well known Ports | 0 – 1023 |
Registered Ports | 1024 – 49151 |
Ephemeral Ports | 49152 – 65535 |
Number of ports: 65,536
Range: 0 – 65535
Type “netstat -a” in the command prompt and press ‘Enter’, this lists all the ports being used.
Range: 0 – 65535
Type “netstat -a” in the command prompt and press ‘Enter’, this lists all the ports being used.
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Socket:
The unique combination of IP address and Port number together are termed as Socket.
The unique combination of IP address and Port number together are termed as Socket.
Few more concepts
DNS Server:
DNS stands for Domain Name system.
DNS is basically a server which translates web addresses or URL (ex: www.google.com) into their corresponding IP addresses. We don’t have to remember all the IP addresses of each and every website.
The command ‘nslookup’ gives you the IP address of the domain you are looking for. This also provides the information of our DNS Server.
DNS Server:
DNS stands for Domain Name system.
DNS is basically a server which translates web addresses or URL (ex: www.google.com) into their corresponding IP addresses. We don’t have to remember all the IP addresses of each and every website.
The command ‘nslookup’ gives you the IP address of the domain you are looking for. This also provides the information of our DNS Server.
ARP:
ARP stands for Address Resolution Protocol.
It is used to convert the IP address to its corresponding Physical Address(i.e.MAC Address).
ARP is used by the Data Link Layer to identify the MAC address of the Receiver’s machine.
RARP:
RARP stands for Reverse Address Resolution Protocol.
As the name suggests, it provides the IP address of the device given a physical address as input. But RARP has become obsolete since the time DHCP has come into the picture.
ARP stands for Address Resolution Protocol.
It is used to convert the IP address to its corresponding Physical Address(i.e.MAC Address).
ARP is used by the Data Link Layer to identify the MAC address of the Receiver’s machine.
RARP:
RARP stands for Reverse Address Resolution Protocol.
As the name suggests, it provides the IP address of the device given a physical address as input. But RARP has become obsolete since the time DHCP has come into the picture.
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