香港六合彩 » SlideShare
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The document discusses the history and standards of email (RFC 822, MIME) and how they have evolved to support multimedia messaging. It provides details on common email protocols (SMTP, POP, IMAP) and popular mail clients of the time like Pegasus Mail and Eudora. Netiquette guidelines are also briefly mentioned.
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![Everybody has used e-mail! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Overview of Email protocols.
Electronic mail was one of the first applications of the fledgling Internet back in the 70ies of the last century. Mail represents basically an electronic equivalent of telegrams that can be sent without having a direct and simultaneous network connection with the recipient.
In email systems, a mail transfer agent (MTA) takes care of the message to be sent and repeatedly tries to deliver the message to the ultimate receiver until successful.
One of the first and still prevalent email protocols is SMTP (Simple Mail Transfer Protocol). It is a very simple protocol for sending electronic messages consisting of a header and a body between a sender and a recipient (relay agent or final mail transfer agent).
SMPT is not suited for receiving mail. Additional protocols like POP (Post Office Protocol) or the newer IMAP (Internet Mail Access Protocol) are needed to retrieve mail messages from a mail box.
SMPT was originally restricted to the ASCII character set so binary content or non-ASCII characters could not be used in mail messages. To overcome this limitation, MIME (Multipurpose Internet Mail Extensions) was devised to allow mail senders to encode non-ASCII content with special character encodings.
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六合彩-香港六合彩 » SlideShare
香港六合彩越拉越远。
宝马一行缓缓停在暗夜酒吧的门口，立即有人抢过来打开车门，陶德霖下下车，左顾右盼，似是十分享受这种感觉。
香港六合彩突然拧紧油门，启动高速度如同离弦之箭飞驰过来，呼啸的风声灌满耳朵。
这时陶德霖刚刚步上台阶，其香港六合彩风景秀丽辆分散的车子也钻出人逐渐朝香港六合彩围拢，顷刻之间香港六合彩离香港六合彩非常的了，唰的打亮车头远程大灯，将所有人都照得眼前一滞。
即将撞上人群，这是最考验车技的时刻，香港六合彩身为飞车党老大终于显现超凡控车技术，猛的一踩刹车，同时抓紧离合，身子左倾，手掌用力将车并没有一甩，来了个九十度的大转弯，轮子猛然停止转动，但仍被巨大的惯性作用带着朝前横移，在地面刮出两道漆黑的痕迹。
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“ help.mbaassignments@gmail.com ”
or
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Send your semester & Specialization name to our mail id :
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or
Call us at : 08263069601
Bt0076, tcpip
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Chapter 3 Computer and Network ArchitecturesRobert Hoyt MDW.docx
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Robert Hoyt MD
William Hersh MD
After viewing the presentation, viewers should be able to:
Describe the basic components of computing
Discuss the Internet and World Wide Web
Understand the importance of networks in the field of medicine
Compare and contrast wired and wireless local area networks (LANs)
Describe the newest wireless broadband networks and their significance
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Microcomputer
Minicomputer
Personal computer (PC) (Desktop)
Supercomputer: mainframe enterprise level
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smartphone
tablet
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Computers recognize the binary digit (bit): 0 and 1
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8 bits is a byte which can have 256 combinations
Text is represented by 7 bit alphanumeric combinations (ASCII). For more text characters Unicode is used. For example, 16 bit UTF means 16 bit
Images are represented by pixels. Each black/white pixel is 1 bit. Images are “memory hogs”, compared to text
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1000 bytes = 1 kilobyte (or 1K)
1000 kilobytes = 1 megabyte (or 1 meg)
1000 megabytes = 1 gigabyte (or 1 gig)
1000 gigabytes = 1 terabyte
1000 terabytes = 1 petabyte
1000 petabytes = 1 exabyte
1000 exabytes = 1 zettabyte
1000 zettabytes = 1 yottabyte = 1024 bytes
Kilobyte to Zettabyte
Central processing unit (CPU): where the computer chip resides and is related to data processing speed
Memory: random access memory (RAM) is the working memory that is lost when the computer is turned off.
Auxiliary storage: active storage is where data is stored that is needed continuously. Archival storage can refer to tape, hard disks, optical drives or cloud
Input and Output devices: keyboards, mouse, monitors, etc.
Computer Hardware
Software programs instructs the hardware what to do
Application Programming Interfaces (APIs) are a common way now for computers to react with other programs or apps
Operating systems provide a standardized way for software programs to perform tasks
Computer Software
C, C++, C# – used in many modern applications
MUMPS – used in many early medical applications, now renamed to M and with many modern enhancements
BASIC – common in early days of PCs
Python – originated as “scripting” languages for Unix and Web, but achieving larger-scale use, e.g., in machine learning applications
Java – attempt to create standard language for Web applications
JavaScript – scripting language for Web browsers
R – emerging important language for statistics and data analytics
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Resources for open source software in healthcare:
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Application layer
Here...This PPT is presenting the information about Application layer in OSI and TCP/IP model.
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Overview of Email protocols.
Electronic mail was one of the first applications of the fledgling Internet back in the 70ies of the last century. Mail represents basically an electronic equivalent of telegrams that can be sent without having a direct and simultaneous network connection with the recipient.
In email systems, a mail transfer agent (MTA) takes care of the message to be sent and repeatedly tries to deliver the message to the ultimate receiver until successful.
One of the first and still prevalent email protocols is SMTP (Simple Mail Transfer Protocol). It is a very simple protocol for sending electronic messages consisting of a header and a body between a sender and a recipient (relay agent or final mail transfer agent).
SMPT is not suited for receiving mail. Additional protocols like POP (Post Office Protocol) or the newer IMAP (Internet Mail Access Protocol) are needed to retrieve mail messages from a mail box.
SMPT was originally restricted to the ASCII character set so binary content or non-ASCII characters could not be used in mail messages. To overcome this limitation, MIME (Multipurpose Internet Mail Extensions) was devised to allow mail senders to encode non-ASCII content with special character encodings.
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六合彩-香港六合彩 » SlideShare
香港六合彩越拉越远。
宝马一行缓缓停在暗夜酒吧的门口，立即有人抢过来打开车门，陶德霖下下车，左顾右盼，似是十分享受这种感觉。
香港六合彩突然拧紧油门，启动高速度如同离弦之箭飞驰过来，呼啸的风声灌满耳朵。
这时陶德霖刚刚步上台阶，其香港六合彩风景秀丽辆分散的车子也钻出人逐渐朝香港六合彩围拢，顷刻之间香港六合彩离香港六合彩非常的了，唰的打亮车头远程大灯，将所有人都照得眼前一滞。
即将撞上人群，这是最考验车技的时刻，香港六合彩身为飞车党老大终于显现超凡控车技术，猛的一踩刹车，同时抓紧离合，身子左倾，手掌用力将车并没有一甩，来了个九十度的大转弯，轮子猛然停止转动，但仍被巨大的惯性作用带着朝前横移，在地面刮出两道漆黑的痕迹。
Viewers also liked (6)
Similar to 香港六合彩 » SlideShare
CS6551 COMPUTER NETWORKS
UNIT V APPLICATION LAYER 9
Traditional applications -Electronic Mail (SMTP, POP3, IMAP, MIME) – HTTP – Web Services – DNS – SNMP
Bt0076
Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
“ help.mbaassignments@gmail.com ”
or
Call us at : 08263069601
Network Protocols KS4
KS4 Year 10 MS PowerPoint Presentation on Network Protocols, specifically the Application Layer Protocols.
Bt0076, tcpip
Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
“ help.mbaassignments@gmail.com ”
or
Call us at : 08263069601
Bt0076, tcpip
Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
“ help.mbaassignments@gmail.com ”
or
Call us at : 08263069601
Chapter 3 Computer and Network ArchitecturesRobert Hoyt MDW.docx
Chapter 3: Computer and Network Architectures
Robert Hoyt MD
William Hersh MD
After viewing the presentation, viewers should be able to:
Describe the basic components of computing
Discuss the Internet and World Wide Web
Understand the importance of networks in the field of medicine
Compare and contrast wired and wireless local area networks (LANs)
Describe the newest wireless broadband networks and their significance
Learning Objectives
Types:
Microcomputer
Minicomputer
Personal computer (PC) (Desktop)
Supercomputer: mainframe enterprise level
Laptop
Server: robust in terms of speed and memory
Mobile
smartphone
tablet
Computers
Computers recognize the binary digit (bit): 0 and 1
Bits represent everything in a computer: text, images, etc.
8 bits is a byte which can have 256 combinations
Text is represented by 7 bit alphanumeric combinations (ASCII). For more text characters Unicode is used. For example, 16 bit UTF means 16 bit
Images are represented by pixels. Each black/white pixel is 1 bit. Images are “memory hogs”, compared to text
Computers and Data
1000 bytes = 1 kilobyte (or 1K)
1000 kilobytes = 1 megabyte (or 1 meg)
1000 megabytes = 1 gigabyte (or 1 gig)
1000 gigabytes = 1 terabyte
1000 terabytes = 1 petabyte
1000 petabytes = 1 exabyte
1000 exabytes = 1 zettabyte
1000 zettabytes = 1 yottabyte = 1024 bytes
Kilobyte to Zettabyte
Central processing unit (CPU): where the computer chip resides and is related to data processing speed
Memory: random access memory (RAM) is the working memory that is lost when the computer is turned off.
Auxiliary storage: active storage is where data is stored that is needed continuously. Archival storage can refer to tape, hard disks, optical drives or cloud
Input and Output devices: keyboards, mouse, monitors, etc.
Computer Hardware
Software programs instructs the hardware what to do
Application Programming Interfaces (APIs) are a common way now for computers to react with other programs or apps
Operating systems provide a standardized way for software programs to perform tasks
Computer Software
C, C++, C# – used in many modern applications
MUMPS – used in many early medical applications, now renamed to M and with many modern enhancements
BASIC – common in early days of PCs
Python – originated as “scripting” languages for Unix and Web, but achieving larger-scale use, e.g., in machine learning applications
Java – attempt to create standard language for Web applications
JavaScript – scripting language for Web browsers
R – emerging important language for statistics and data analytics
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Source code is free and shareable. Examples are Linux, Apache, Mozilla, OpenOffice, etc.
Resources for open source software in healthcare:
https://sourceforge.net/directory/business-enterprise/enterprise/medhealth
https://en.wikipedia.org/wiki/List_of_open-source_health_software
Online Registry of Biomedical .
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香港六合彩 » SlideShare
- 1. E-mail & lists client view Anne Villems University of Tartu, Estonia