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Types of Protocol

Ethernet (Physical/Data Link Layers)
Ethernet (Physical/Data Link Layers)

Data (Ethernet): When processing at physical layer and link layer is completed , frame data is forward towards upper layer protocols for processing which is show in Type Field. Although Ethernet version 2 does not specify any padding (in contrast to IEEE 802.3), Ethernet expects at least 46 bytes of data.

source: tech-faq.com
image: highteck.net
File Retrieval Protocols
File Retrieval Protocols

File retrieval protocols This type of service was one of the earliest ways of retrieving information from computers connected to the Internet. You could view the names of the files stored on the serving computer, but you didn't have any type of graphics and sometimes no description of a file's content.

source: usg.edu
FTP
FTP

File Transfer Protocol (FTP) is a standard Internet protocol for transmitting files between computers on the Internet over TCP/IP connections. FTP is a client-server protocol that relies on two communications channels between client and server: a command channel for controlling the conversation and a data channel for transmitting file content.

FTP (File Transfer Protocol)
FTP (File Transfer Protocol)

File Transfer Protocol (FTP) is a client/server protocol used for transferring files to or exchanging files with a host computer. It may be authenticated with user names and passwords. Anonymous FTP allows users to access files, programs and other data from the Internet without the need for a user ID or password.

Gopher
Gopher

The Gopher protocol / ˈ ɡ oʊ f ər / is a TCP/IP application layer protocol designed for distributing, searching, and retrieving documents over the Internet.

HTTP, FTP, SMTP and DNS (Session/Presentation/Application Layers)
HTTP, FTP, SMTP and DNS (Session/Presentation/Application Layers)

HTTP (Hypertext Transfer Protocol): This is a protocol used mainly to access data on the World Wide Web (www). The Hypertext Transfer Protocol (HTTP) the Web's main application-layer protocol although current browsers can access other types of servers; A respository of information spread all over the world and linked together.

source: gradeup.co
Layer 1: The Physical Layer
Layer 1: The Physical Layer

In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer. This layer may be implemented by a PHY chip. The physical layer consists of the electronic circuit transmission technologies of a network. It is a fundamental layer underlying the higher level functions in a network.

Layer 2: The Data-Link Layer
Layer 2: The Data-Link Layer

The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking. This layer is the protocol layer that transfers data between adjacent network nodes in a wide area network (WAN) or between nodes on the same local area network (LAN) segment.

Layer 3: The Network Layer
Layer 3: The Network Layer

The TCP/IP model describes the protocols used by the Internet. The TCP/IP model has a layer called the Internet layer, located above the link layer. In many textbooks and other secondary references, the TCP/IP Internet layer is equated with the OSI network layer.

image: youtube.com
Layer 4: The Transport Layer
Layer 4: The Transport Layer

Even though this is a common mistake and many folks tend to group these levels, understanding the differences between layers 4-7 of the OSI Model will help to enhance your troubleshooting and design skills. Layer 4 is also sort of the "hot" layer right now.

Layer 5: The Session Layer
Layer 5: The Session Layer

For connection-oriented network protocols, understanding how the session layer works, and what symptoms would help you identify when it's not working, is an important part of your job as a network administrator.

image: youtube.com
Layer 6: The Presentation Layer
Layer 6: The Presentation Layer

The presentation layer is layer 6 of the 7-layer Open Systems Interconnection (OSI) model. It is used to present data to the application layer (layer 7) in an accurate, well-defined and standardized format.

image: quazoo.com
Layer 7: The Application Layer
Layer 7: The Application Layer

The application layer is a layer in the Open Systems Interconnection (OSI) seven-layer model and in the TCP/IP protocol suite. It consists of protocols that focus on process-to-process communication across an IP network and provides a firm communication interface and end-user services.

image: youtube.com
TCP and SPX (Transport Layer)
TCP and SPX (Transport Layer)

For example, the name “TCP/IP” comes from the suite’s most commonly used transport layer protocol (TCP) and network layer protocol (IP). Similarly, the Novell NetWare suite is often called “IPX/SPX” for its layer three (IPX) and layer four (SPX) protocols. Typically, specific transport layer protocols use the network layers in the same family.

Telnet
Telnet

What is Telnet? Telnet is a user command and an underlying TCP/IP protocol for accessing remote computers. Through Telnet, an administrator or another user can access someone else's computer remotely.

What is a Protocol?
What is a Protocol?

Protocols exist at several levels in a telecommunication connection. For example, there are protocols for the data interchange at the hardware device level and protocols for data interchange at the application program level.

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