ICND110S01L05-TCP IP Transport Layer

思科学习资料

Understanding the TCP/IP Transport Layer

Building a Simple Network

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-1

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Transport Layer

Session multiplexing Segmentation Flow control (when required) Connection-oriented (when required) Reliability (when required)

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-2

思科学习资料

Reliable vs. Best-Effort Comparison

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-3

思科学习资料

UDP CharacteristicsOperates at transport layer of OSI and TCP/IP models Provides applications with access to the network layer without the overhead of reliability mechanisms Is a connectionless protocol Provides limited error checking Provides best-effort delivery Has no data-recovery features

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-4

思科学习资料

UDP Header

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-5

思科学习资料

TCP CharacteristicsTransport layer of the TCP/IP stack Access to the network layer for applications Connection-oriented protocol Full-duplex mode operation Error checking Sequencing of data packets Acknowledgement of receipt Data-recovery features

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-6

思科学习资料

TCP Header

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-7

思科学习资料

TCP/IP Application Layer OverviewFile transfer – FTP – TFTP – Network File System E-mail – Simple Mail Transfer Protocol Remote login – Telnet – rlogin Network management – Simple Network Management Protocol Name management – Domain Name System 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-8

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Mapping Layer 3 to Layer 4

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-9

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Mapping Layer 4 to Applications

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-10

思科学习资料

Establishing a Connection

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-11

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Three-Way Handshake

CTL = Which control bits in the TCP header are set to 1 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—1-12

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Flow Control

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-13

思科学习资料

TCP Acknowledgment

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-14

思科学习资料

Fixed Windowing

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-15

思科学习资料

TCP Sliding Windowing

2007 Cisco Systems, Inc. All rights reserved.

ICND1 v1.0—1-16