Layer 6 Presentation Layer

De/Encryption, Encoding, String representation

The presentation layer (data presentation layer, data provision level) sets the system-dependent representation of the data (for example, ASCII, EBCDIC) into an independent form, enabling the syntactically correct data exchange between different systems. Also, functions such as data compression and encryption are guaranteed that data to be sent by the application layer of a system that can be read by the application layer of another system to the layer 6. The presentation layer. If necessary, the presentation layer acts as a translator between different data formats, by making an understandable for both systems data format, the ASN.1 (Abstract Syntax Notation One) used.

OSI Layer 6 - Presentation Layer

The presentation layer is responsible for the delivery and formatting of information to the application layer for further processing or display. It relieves the application layer of concern regarding syntactical differences in data representation within the end-user systems. An example of a presentation service would be the conversion of an EBCDIC-coded text computer file to an ASCII-coded file. The presentation layer is the lowest layer at which application programmers consider data structure and presentation, instead of simply sending data in the form of datagrams or packets between hosts. This layer deals with issues of string representation - whether they use the Pascal method (an integer length field followed by the specified amount of bytes) or the C/C++ method (null-terminated strings, e.g. "thisisastring\0"). The idea is that the application layer should be able to point at the data to be moved, and the presentation layer will deal with the rest. Serialization of complex data structures into flat byte-strings (using mechanisms such as TLV or XML) can be thought of as the key functionality of the presentation layer. Encryption is typically done at this level too, although it can be done on the application, session, transport, or network layers, each having its own advantages and disadvantages. Decryption is also handled at the presentation layer. For example, when logging on to bank account sites the presentation layer will decrypt the data as it is received.[1] Another example is representing structure, which is normally standardized at this level, often by using XML. As well as simple pieces of data, like strings, more complicated things are standardized in this layer. Two common examples are 'objects' in object-oriented programming, and the exact way that streaming video is transmitted. In many widely used applications and protocols, no distinction is made between the presentation and application layers. For example, HyperText Transfer Protocol (HTTP), generally regarded as an application-layer protocol, has presentation-layer aspects such as the ability to identify character encoding for proper conversion, which is then done in the application layer. Within the service layering semantics of the OSI network architecture, the presentation layer responds to service requests from the application layer and issues service requests to the session layer. In the OSI model: the presentation layer ensures the information that the application layer of one system sends out is readable by the application layer of another system. For example, a PC program communicates with another computer, one using extended binary coded decimal interchange code (EBCDIC) and the other using ASCII to represent the same characters. If necessary, the presentation layer might be able to translate between multiple data formats by using a common format. Wikipedia
  • Data conversion
  • Character code translation
  • Compression
  • Encryption and Decryption

The Presentation OSI Layer is usually composed of 2 sublayers that are:

CASE common application service element

Sase specific application service element, layer 7   application layer, layer 6   presentation layer, layer 5   session layer, layer 4   transport layer, layer 3   network layer, layer 2   data link layer, layer 1   physical layer.

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Prerequisite : OSI Model

Introduction : Presentation Layer is the 6th layer in the Open System Interconnection (OSI) model. This layer is also known as Translation layer, as this layer serves as a data translator for the network. The data which this layer receives from the Application Layer is extracted and manipulated here as per the required format to transmit over the network. The main responsibility of this layer is to provide or define the data format and encryption. The presentation layer is also called as Syntax layer since it is responsible for maintaining the proper syntax of the data which it either receives or transmits to other layer(s).

Functions of Presentation Layer :

The presentation layer, being the 6th layer in the OSI model, performs several types of functions, which are described below-

  • Presentation layer format and encrypts data to be sent across the network.
  • This layer takes care that the data is sent in such a way that the receiver will understand the information (data) and will be able to use the data efficiently and effectively.
  • This layer manages the abstract data structures and allows high-level data structures (example- banking records), which are to be defined or exchanged.
  • This layer carries out the encryption at the transmitter and decryption at the receiver.
  • This layer carries out data compression to reduce the bandwidth of the data to be transmitted (the primary goal of data compression is to reduce the number of bits which is to be transmitted).
  • This layer is responsible for interoperability (ability of computers to exchange and make use of information) between encoding methods as different computers use different encoding methods.
  • This layer basically deals with the presentation part of the data.
  • Presentation layer, carries out the data compression (number of bits reduction while transmission), which in return improves the data throughput.
  • This layer also deals with the issues of string representation.
  • The presentation layer is also responsible for integrating all the formats into a standardized format for efficient and effective communication.
  • This layer encodes the message from the user-dependent format to the common format and vice-versa for communication between dissimilar systems.
  • This layer deals with the syntax and semantics of the messages.
  • This layer also ensures that the messages which are to be presented to the upper as well as the lower layer should be standardized as well as in an accurate format too.
  • Presentation layer is also responsible for translation, formatting, and delivery of information for processing or display.
  • This layer also performs serialization (process of translating a data structure or an object into a format that can be stored or transmitted easily).

Features of Presentation Layer in the OSI model: Presentation layer, being the 6th layer in the OSI model, plays a vital role while communication is taking place between two devices in a network.

List of features which are provided by the presentation layer are:

  • Presentation layer could apply certain sophisticated compression techniques, so fewer bytes of data are required to represent the information when it is sent over the network.
  • If two or more devices are communicating over an encrypted connection, then this presentation layer is responsible for adding encryption on the sender’s end as well as the decoding the encryption on the receiver’s end so that it can represent the application layer with unencrypted, readable data.
  • This layer formats and encrypts data to be sent over a network, providing freedom from compatibility problems.
  • This presentation layer also negotiates the Transfer Syntax.
  • This presentation layer is also responsible for compressing data it receives from the application layer before delivering it to the session layer (which is the 5th layer in the OSI model) and thus improves the speed as well as the efficiency of communication by minimizing the amount of the data to be transferred.

Working of Presentation Layer in the OSI model : Presentation layer in the OSI model, as a translator, converts the data sent by the application layer of the transmitting node into an acceptable and compatible data format based on the applicable network protocol and architecture.  Upon arrival at the receiving computer, the presentation layer translates data into an acceptable format usable by the application layer. Basically, in other words, this layer takes care of any issues occurring when transmitted data must be viewed in a format different from the original format. Being the functional part of the OSI mode, the presentation layer performs a multitude (large number of) data conversion algorithms and character translation functions. Mainly, this layer is responsible for managing two network characteristics: protocol (set of rules) and architecture.

Presentation Layer Protocols : Presentation layer being the 6th layer, but the most important layer in the OSI model performs several types of functionalities, which makes sure that data which is being transferred or received should be accurate or clear to all the devices which are there in a closed network. Presentation Layer, for performing translations or other specified functions, needs to use certain protocols which are defined below –

  • Apple Filing Protocol (AFP): Apple Filing Protocol is the proprietary network protocol (communications protocol) that offers services to macOS or the classic macOS. This is basically the network file control protocol specifically designed for Mac-based platforms.
  • Lightweight Presentation Protocol (LPP): Lightweight Presentation Protocol is that protocol which is used to provide ISO presentation services on the top of TCP/IP based protocol stacks.
  • NetWare Core Protocol (NCP): NetWare Core Protocol is the network protocol which is used to access file, print, directory, clock synchronization, messaging, remote command execution and other network service functions.
  • Network Data Representation (NDR): Network Data Representation is basically the implementation of the presentation layer in the OSI model, which provides or defines various primitive data types, constructed data types and also several types of data representations.
  • External Data Representation (XDR): External Data Representation (XDR) is the standard for the description and encoding of data. It is useful for transferring data between computer architectures and has been used to communicate data between very diverse machines. Converting from local representation to XDR is called encoding, whereas converting XDR into local representation is called decoding.
  • Secure Socket Layer (SSL): The Secure Socket Layer protocol provides security to the data that is being transferred between the web browser and the server. SSL encrypts the link between a web server and a browser, which ensures that all data passed between them remains private and free from attacks.

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Presentation Layer

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What is the Presentation Layer?

Presentation Layer is the Layer 6 of the seven-layer Open Systems Interconnection (OSI) reference model . The presentation layer structures data that is passed down from the application layer into a format suitable for network transmission. This layer is responsible for data encryption, data compression, character set conversion, interpretation of graphics commands, and so on. The network redirector also functions at this layer.

Presentation Layer

Presentation Layer functions

  • Translation:  Before being transmitted, information in the form of characters and numbers should be changed to bit streams. Layer 6 is responsible for interoperability between encoding methods as different computers use different encoding methods. It translates data between the formats the network requires and the format the computer.
  • Encryption:  Encryption at the transmitter and decryption at the receiver
  • Compression:  Data compression to reduce the bandwidth of the data to be transmitted. The primary role of  data compression  is to reduce the number of bits to be transmitted. Multimedia files, such as audio and video, are bigger than text files and compression is more important.

Role of Presentation Layer in the OSI Model

This layer is not always used in network communications because its functions are not always necessary. Translation is only needed if different types of machines need to talk with each other. Encryption is optional in communication. If the information is public there is no need to encrypt and decrypt info. Compression is also optional. If files are small there is no need for compression.

Explaining Layer 6 in video

Most real-world protocol suites, such as TCP/IP , do not use separate presentation layer protocols. This layer is mostly an abstraction in real-world networking.

An example of a program that loosely adheres to layer 6 of OSI is the tool that manages the Hypertext Transfer Protocol (HTTP) — although it’s technically considered an application-layer protocol per the TCP/IP model.

However, HTTP includes presentation layer services within it. HTTP works when the requesting device forwards user requests passed to the web browser onto a web server elsewhere in the network.

It receives a return message from the web server that includes a multipurpose internet mail extensions (MIME) header. The MIME header indicates the type of file – text, video, or audio – that has been received so that an appropriate player utility can be used to present the file to the user.

In short, the presentation layer

Makes sure that data which is being transferred or received should be accurate or clear to all the devices which are there, in a closed network.

  • ensures proper formatting and delivery to and from the application layer;
  • performs data encryption; and
  • manages serialization of data objects.

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How to Design PowerPoint Slides With Layers & Depth

  • By: Amy Boone

When you design your PowerPoint slides for your presentations, it’s common to think in terms of linear sequence. Slide 1 comes before slide 2 which comes before slide 3, and so on. Linear progression makes sense to us. And for good reason. It is tied to the way we write and read. We also think of time as moving on a line (hence the creation of timelines). Even design storyboarding moves through a sequence of chronological squares. Linear progression is part of our lives. Don’t worry, we aren’t asking you to abandon something that makes so much sense.

However, we believe you can elevate your slide design when you think not only of how your slide deck advances forward, but also of how layers can stack up to create depth and beauty as you move forward. Today we’re looking at 3 quick ways to create PowerPoint slides with more depth.

1. Use Textures

Home designers know that layering textures is one of the best ways to make a space feel welcoming. They say, ““If you’re looking to create more visual interest in a room, adding texture is a surefire way to accomplish your goal. ” We can use this same principle to add visual interest to our slides. But we aren’t asking you to use a brick or water texture for your slide background. That can look heavy-handed and dated. Instead, opt for more subtle textures that you can layer with color, text, and gradients.

Try creating your own backgrounds simply using your smartphone . In the following slide, I took a closeup picture of a plant leaf (with all of its natural variations and veining) in my office and recolored it using the preset color option on PowerPoint’s format picture menu. It’s a simple way to create one-of-a-kind backgrounds with depth in just a few steps.

2. Use Gradient Layers

Gradient layers are another easy way to give your slides depth. You can apply them over the full screen or just a portion of it, as shown below. Here we see a box that covers the right 2/3 of the screen that has been set to a gradient fill.

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In the following examples, you can see how this gradient box creates depth with a couple different images. All you have to do is play with the transparency of the primary image so that the gradient shows through.

Watercolor Background Without Gradient Layer

Watercolor background with gradient layer, golf ball without gradient layer, golf ball with gradient layer, 3. use powerpoint’s design ideas feature.

Finally, you can make use of preset designs to add depth to an otherwise flat PowerPoint slide. One of the best additions PowerPoint has made to their program in the past decade is their Design Ideas (formerly Designer) function. During its release, the Corporate VP for Microsoft 365 said, “this all works thanks to a powerful combination of automated design and smart image analysis . PowerPoint Designer was built in collaboration with professional graphic designers , who helped develop over 12,000 creative blueprints. Designer applies cloud intelligence to analyze and identify the most compelling portion of your images to determine which blueprints work best with your content.”

The nice thing about these automated designs is that they always include layers of depth—many of which I wouldn’t think to include if I was designing on my own. You can take advantage of these smart design elements easily. First, load a slide with the images, shapes, and text that you want to use. You can see below that I started a simple title slide and added one line of text and one stock picture from PowerPoint’s image bank.

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A Tip for Working with Layers: Use the Selection Pane

Once you start adding layers, it can get confusing to work with them. That’s why I recommend using the selection pane function in PowerPoint. Rather than clicking through layers that are hidden behind each other, simply pull up the selection pane menu, so you can see what you are working with.

For example, this fairly simple slide template has a lot of depth and texture, and the selection pane shows there are 6 elements working together to give it that feeling. From this menu, you can also choose to hide/show certain elements which helps show how each layer is functioning. You can also reorder and rename your elements easily.

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Want more tips and tricks for creating presentation design that truly wows? Check out our blog , browse our design portfolio, or get in touch with one of our presentation experts now .

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Chiefs' Harrison Butker blasted for commencement speech encouraging women to be homemakers

Kansas City Chiefs kicker Harrison Butker has aggravated one of the internet's biggest culture wars by telling a class of college graduates that one of the “most important” titles a woman can hold is homemaker.

During a commencement speech last weekend at Benedictine College, a Catholic liberal arts school in Atchison, Kansas, the NFL player railed against abortion, Pride month and Covid-19 lockdown measures.

Drawing the most viral backlash this week, however, was a section of his speech in which he addressed the female graduates specifically — telling them that it’s women who have had “the most diabolical lies” told to them.

“How many of you are sitting here now, about to cross this stage, and are thinking about all the promotions and titles you are going to get in your career? Some of you may go on to lead successful careers in the world,” Butker said. “But I would venture to guess that the majority of you are most excited about your marriage and the children you will bring into this world.”

The criticisms that followed took aim at Butker as well as the NFL.

Harrison Butker.

"Hey @NFL — If you want to continue to grow your female fan base and any other marginalized group (straight white men are already watching your product), come get your boy," wrote Lisa Guerrero, a former NFL sideline reporter and now an investigative journalist for "Inside Edition."

He went on to tell the graduates that his wife would agree that her life “truly started when she began living her vocation as a wife and as a mother.” It is her embrace of this role, he said, that made his own professional success possible.

Butker’s comments share similarities with some of the more extreme ideas around gender roles that have gained traction in communities that promote “ tradwife ” lifestyles or other relationship dynamics that center on traditional gender roles .

“Listen, there’s nothing wrong with his wife being a homemaker. Homemakers are wonderful, that’s not the point,” filmmaker Michael McWhorter, known by his more than 6 million TikTok followers as TizzyEnt, said in a video response. “The point is he seemed to be acting as if you should be ashamed if you don’t want to be a homemaker, or, ‘I know what you really want to do is just stay home and have babies.’"

The speech was the latest incident to add fuel to the flames of this increasingly vocal cultural battle, much of which is playing out online. While many prominent right-wing men have voiced such beliefs before, they’re usually confined to internet forums, podcasts and other online communities where these ideologies thrive.

A spokesperson for Butker did not immediately respond to a request for comment.

Benedictine College and the Kansas City Chiefs did not immediately respond to a request for comment.

A spokesperson for the NFL told People Magazine that Butker "gave a speech in his personal capacity" and his "views are not those of the NFL as an organization."

"The NFL is steadfast in our commitment to inclusion, which only makes our league stronger," a spokesperson told the publication.

Butker, who is teammates with Chiefs tight end Travis Kelce, further drew surprise and criticism when he quoted Kelce’s girlfriend, Taylor Swift, whose monumental career success as a global pop star has inspired college courses .

“As my teammate’s girlfriend says, ‘familiarity breeds contempt,’” he said, drawing murmurs from the crowd as he used the “Bejeweled” lyric as an analogy for why Catholic priests should not become “overly familiar” with their parishioners.

In the days since his speech, a Change.org petition for the Chiefs to dismiss Butker for “discriminatory remarks” has garnered nearly 19,000 signatures.

“These comments reinforce harmful stereotypes that threaten social progress,” the petition stated. “They create a toxic environment that hinders our collective efforts towards equality, diversity and inclusion in society. It is unacceptable for such a public figure to use their platform to foster harm rather than unity.”

Those who criticized Butker’s speech online include actor Bradley Whitford as well as DJ and rapper (and self-proclaimed Swiftie ) Flavor Flav .

But his speech was also lauded by some on the religious right, including conservative sports media personalities such as Clay Travis and Jason Whitlock , who defended Butker’s statements toward women.

“Not a word Harrison Butker says here should be remotely controversial. He’s 100% correct,” former NFL wide receiver T.J. Moe posted on X . “Those trying to convince women that being assistant VP of lending & intentionally childless at age 40 is more fulfilling than making a family and home are evil.”

Sports and culture commentator Jon Root also posted that Butker “exposed the lies that the world has been telling women.” Women, he wrote, are wrongly encouraged to climb the corporate ladder, view children as a “burden” and see marriage as “not worth pursuing.”

Still, a deluge of viewers online took issue with his attitude toward women and the LGBTQ community. Many women also rejected the premise that they would be happier staying at home in lieu of paid work, even if they do have a husband and children.

“I am moved. I actually had no idea that my life began when I met my husband,” neurosurgeon Betsy Grunch, known as Ladyspinedoc on TikTok, said sarcastically in a TikTok video . “It did not begin when I graduated magna cum laude from the University of Georgia with honors. It certainly did not begin when I graduated with a 4.0 GPA, Alpha Omega Alpha, from medical school. And I had no idea that it did not begin when I completed my residency in neurosurgery.”

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Angela Yang is a culture and trends reporter for NBC News.

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