protocols and common examples Flashcards
what is a protocol
a set of instructions that govern communication over a network
An application layer
an abstraction layer that specifies the shared communications protocols and interface methods used by hosts in a communications network. The application layer abstraction is used in both of the standard models of computer networking.
Transport layer.
MANAGES END TO END COMMUNICATION OVER A NETWORK. Examples are TCP, UDP
The transport layer is also responsible for the management of error correction, providing quality and reliability to the end user. This layer enables the host to send and receive error corrected data, packets or messages over a network and is the network component that allows multiplexing.
internet Layer
The layer above the Network Access Layer in the protocol hierarchy is the Internet Layer . The Internet Protocol is the heart of TCP/IP and the most important protocol in the Internet Layer. IP provides the basic packet delivery service on which TCP/IP networks are built. All protocols, in the layers above and below IP, use the Internet Protocol to deliver data. All TCP/IP data flows through IP, incoming and outgoing, regardless of its final destination.
network layer
The network layer is the third level. This layer deals with sending data across multiple networks (possible the internet) from the source network to the destination network
This is known as routing and is the role of the IP
The Internet Protocol
The Internet Protocol is the building block of the Internet. Its functions include:
Defining the datagram, which is the basic unit of transmission in the Internet
Defining the Internet addressing scheme
Moving data between the Network Access Layer and the Host-to-Host Transport Layer.
Routing datagrams to remote hosts
Performing fragmentation and re-assembly of datagrams
Link layer:
this layer controls the transmission and reception of packets of data to/from a local network
What is a protocol stack?
A hierarchical set of network protocol layers and they all work together.
POP
POP will download files like emails to your computer so no internet is needed and no connection to the sever is needed.
IMAP
do not download the messages and are saved on a messenger server but you must also have a constant connection.
ISP internet service provider
The ISP is an organization that provides internet services. These services are hosted on computers called server.
Data packet:
Unit of data made into to single packages that travels along a given network path. Data packets are used in the internet protocol (IP) transmissions for data that navigates the Web, and in other kinds of networks.
MAC address
MAC addresses identify computers based on who manufactured their network car.
It is more useful to identify computers based on which network they are connected to . In fact computer are grouped into sub-networks of usually only a few hundred devices, each with their own IP address
Protocol examples
Protocols examples
Ethernet Wi fi Tcp/ip Http Https Ftp Pop3 Smtp Imap
protocol stack/suite
Is a group of network protocols that can be used together.
It is often organized in layers, where one protocol passes its data to the next before being sent across a communication system.
