Lecture CCNA Exploration 4.0 (Kỳ 1) - Chapter 4: OSI Transport Layer

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This chapter explain the role of Transport Layer protocols and services in supporting communications across data networks, analyze the application and operation of TCP mechanisms that support reliability, analyze the application and operation of TCP mechanisms that support reassembly and manage data loss, analyze the operation of UDP to support communicate between two processes on end devices.

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Nội dung Text: Lecture CCNA Exploration 4.0 (Kỳ 1) - Chapter 4: OSI Transport Layer

Chapter 4 OSI Transport Layer CCNA Exploration version 4.0
Objectives • Explain the role of Transport Layer protocols and services in supporting communications across data networks • Analyze the application and operation of TCP mechanisms that support reliability • Analyze the application and operation of TCP mechanisms that support reassembly and manage data loss. • Analyze the operation of UDP to support communicate between two processes on end devices Học viện mạng Bách Khoa - Website: www.bkacad.com 2
Application data IP Protocol Field = 17 Application data IP Protocol Field = 6 Học viện mạng Bách Khoa - Website: www.bkacad.com 3
Extra: Logical Connection Connection- oriented Connectionless Connectionless Học viện mạng Bách Khoa - Website: www.bkacad.com 4
Extra: TCP Operation • IP is best effort delivery. • The transport layer (TCP) is responsible reliability and flow control from source to destination.This is accomplished using: – sliding windows (flow control) – sequencing numbers and acknowledgments (reliability) – synchronization (establish a virtual circuit) Học viện mạng Bách Khoa - Website: www.bkacad.com 5
Roles of Transport Layer Học viện mạng Bách Khoa - Website: www.bkacad.com 6
Transport Layer Role and Services • The functions 1. Enables multiple applications to communicate over the network at the same time on a single device 2. Ensures that, if required, all the data is received reliably and in order by the correct application 3. Employs error handling mechanisms Học viện mạng Bách Khoa - Website: www.bkacad.com 7
Transport Layer Role and Services 4.1.1 • Primary responsibilities 1. Tracking the individual communication between applications on the source and destination hosts 2. Segmenting data and managing each piece 3. Reassembling the segments into streams of application data 4. Identifying the different applications Học viện mạng Bách Khoa - Website: www.bkacad.com 8
Transport Layer Role and Services Học viện mạng Bách Khoa - Website: www.bkacad.com 9
Separating Multiple Communications 4.1.2 Học viện mạng Bách Khoa - Website: www.bkacad.com 10
Extra: Multiplexing • Different applications can send data segments on a first-come, first-served basis. • The segments that arrive first will be taken care of first. This is referred to as the multiplexing of upper-layer conversations. Học viện mạng Bách Khoa - Website: www.bkacad.com 11
Segmentation Học viện mạng Bách Khoa - Website: www.bkacad.com 12
Q/A • Conversation vs Session ? Học viện mạng Bách Khoa - Website: www.bkacad.com 13
Controlling the Conversation 4.1.2.1 Học viện mạng Bách Khoa - Website: www.bkacad.com 14
Controlling the Conversation The primary functions 1. Segmentation and Reassembly 2. Conversation Multiplexing Other functions: • Connection-oriented conversations • Reliable delivery • Ordered data reconstruction • Flow control Học viện mạng Bách Khoa - Website: www.bkacad.com 15
Controlling the Conversation 4.1.2.2 Học viện mạng Bách Khoa - Website: www.bkacad.com 16
Transport Layer Role and Services 4.1.3 Học viện mạng Bách Khoa - Website: www.bkacad.com 17
Transport Layer Role and Services 4.1.3 At the Transport layer the 3 basic operations of reliability are: 1.Tracking transmitted data 2.Acknowledging received data 3.Retransmitting any unacknowledged data Học viện mạng Bách Khoa - Website: www.bkacad.com 18
TCP and UDP 4.1.4 Web, email, file transfer DNS, Video streaming, VoIP Học viện mạng Bách Khoa - Website: www.bkacad.com 19
TCP Header format: Học viện mạng Bách Khoa - Website: www.bkacad.com 20