Networks Flashcards
What is meant by Network?
Set of devices connected to each other over the physical medium is known as a computer network. For example the Internet.
What do you mean by Node?
In the computer network, the node is known as a device.
What do you mean by Network Topology?
A network topology is a physical structure of the network which defines how the computers or node will be connected to each other.
What are Routers?
A router is a device which is responsible for sending data from source to destination over the computer network.
What is the OSI model?
OSI model stands for Open System Interconnection. It’s a reference model which describes that how different applications will communicate to each other over the computer network.
Explain the Different layers of the OSI model.
Physical Layer
Converts data bit into an electrical impulse.
Datalink Layer
Data packet will be encoded and decoded into bits.
Network Layer
Transfer of datagrams from one to another.
Transport Layer
Responsible for Data transfer from one to another.
Session Layer
Manage and control signals between computers.
Presentation Layer
Transform data into application layer format.
Application Layer
An end user will interact with the Application layer.
Describe Hub, Switch and Router?
Hub: Hub will broadcast all data to every port. It has a common connection point for all devices.
Switch: Switch will create the dynamic connection and provide information to the requesting port.
Router: Router is the devices which will be responsible for forwarding data packets.
Define the TCP/IP Model?
TCP/IP stands for Transmission control protocol and Internet protocol. It describes how the data will get transmitted and routed from end to end communication.
List the different Layers of TCP/IP Model.
Application Layer, Transport Layer, Network or Internet Layer, Network interface layer.
Define HTTP.
HTTP stands for Hyper Text Transfer Protocol and the port for this is 80. This protocol is responsible for web content.
Define TCP and UDP
TCP stands for Transfer control protocol and UDP stands for User Datagrams protocol and TCP is a connection-oriented protocol and UDP is a Connectionless protocol.
Define DNS?
DNS Stands for Domain Name System. It’s an internet address mapping process with the local name. We can also call it as an internet phonebook.
What do you mean by Proxy server?
Proxy server prevents the external users which are unauthorized to access the network.
Define different network classes.
Class A - 0.0.0.0 to 127.255.255.255
Class B - 128.0.0.0 to 191.255.255.255
Class C - 192.0.0.0 to 223.255.255.255
Class D - 224.0.0.0 to 239.255.255.255
Class E - 240.0.0.0 to 247.255.255.255
What is a NIC
NIC stands for Network interface card. It is an adapter that will be installed on the computer and because of that NIC, only that computer will interact with the network.
