CCNA Revision (Session 2-3)

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Egypt MoMo-ElSafty
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Published on ● Video Link: https://www.youtube.com/watch?v=0dLiPGKr11o


Duration: 15:25
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13

OSI Model:
7 Application تجهيز
6 Presentationتكويد
5 Session تتميم
4 Transport تقطيع تصوير ترقيم
3 Network
2 Data Link & H/W
1 Physical & CABLE
L7. Application Layer:
It is responsible for making the proper data preparation for the proper service.
بيحدد نوع ال سرفيس المناسبة لل ريكوست
Browsing HTTP
File upload & Download (Huge Files) FTP
Send Email SMTP
Retrieve Email POP3
Remote login Telnet
Real-time (Voice, Video, Gaming) RTP (Real-time Transfer Protocol
L6. Presentation layer:
It is responsible for finding common data representation between the sender & receiver.
ASCII حروف وارقام
JPG, GIF, IIF= PIC
MP3, Midi= Audio
AVI, Mpeg, MP4= Video
L5. Session:
It is responsible for making sure that all information required for session opening becomes ready, in that case, it will give orders for:
- Session establishment انشاء
- Session Management & Control معالجة
- Session Termination انهاء
L4. Transport:
It is responsible for actual mechanics:
- Session establishment انشاء
- Session Management & Control معالجة
- Session Termination انهاء
EX: TCP ( Transmission Control protocol) & UDP (User Datagram Protocol) تقطيع- ترقيم- تصوير



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