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CCNA Day 1
- 1. Chapter 2 Internetworking Concepts Overview
- 3. OSI Model Overview Application (Upper) Layers Session Presentation Application
- 4. OSI Model Overview Data Flow Layers Transport Layer Data Link Network Layer Physical Application (Upper) Layers Session Presentation Application
- 5. Role of Application Layers Telnet FTP User Interface EXAMPLES Application
- 14. Encapsulating Data Transport Data Link Physical Network Upper Layer Data Upper Layer Data TCP Header Data IP Header Data LLC Header 0101110101001000010 Data MAC Header Presentation Application Session Segment Packet Bits Frame PDU FCS FCS
- 15. Upper Layer Data De-encapsulating Data LLC Hdr + IP + TCP + Upper Layer Data MAC Header IP + TCP + Upper Layer Data LLC Header TCP+ Upper Layer Data IP Header Upper Layer Data TCP Header 0101110101001000010 Transport Data Link Physical Network Presentation Application Session
- 16. Application Presentation Session Transport Network Data Link Physical OSI Model PDU Functional Responsibilities Examples Written Exercise: OSI Model
Notes de l'éditeur
- Purpose: This chapter reviews general networking theory and introduces students to some of Cisco’s product line. Timing: This chapter takes approximately 1.5 hours to present. Note: This section has a product selection tool laboratory exercise at the end. Contents: Objectives—This section explains what the student will be able to do at the end of this chapter. Defining Network Components—This section displays where devices are placed in the network. Mapping Business Needs to a Hierarchical Model—This section describes the heirarchical model used in network design. OSI Model Overview—This section reviews the OSI model. Communicating Between Layers—This section describes encapsulation and de-encapsulation. Written Exercise 1—This section has a written exercise to test the students’ knowledge of the OSI model. Physical Layer Functions—This section describes the physical layer of the OSI Model. Data Link Layer Functions—This section describes the data link layer of the OSI Model. Network Layer Functions—This section describes the network layer of the OSI Model. Transport Layer Functions—This section describes the transport layer of the OSI Model.
- Purpose: this figure states the chapter objectives. Emphasize: Read or state each objective so each student has a clear understanding of the chapter objectives.
- Layer 1 of 2: Purpose: This figure orients the students to the OSI model. Emphasize: This model should be a review for students who attend this course. Gage the depth of your discussion around the knowledge of the students. Transition: The following layer discusses the lower layers of the OSI reference model.
- Layer 2 of 2: Purpose: This figure orients the students to the next set of concepts. Emphasize: The Data Link layer of the OSI reference model is implemented by Switches and Bridges. These devices encapsulate date in “frames”. The Network layer of the OSI reference model is implemented by Routers. These devices encapsulate data in ‘packets’. The Transport layer of the OSI reference model is implemented by various protocols; one of which is TCP. TCP uses ports and encapsulates the data in ‘segments’.
- Slide 1 of 4: Purpose: This figure orients the students to the application layer. Emphasize: This layer discusses network applications rather than computer applications. So, applications such as spreadsheets, word processors, or presentation graphics are not the applications being described here. Network applications may be applications that support, electronic mail, file transfer, remote access, network management, and so on. Transition: The following discusses the presentation layer.
- Slide 2 of 4: Purpose: This figure orients the students to the presentation layer. Emphasize: This layer discusses code formatting, data presentation standards, and conversion. Transition: The following discusses the session layer.
- Slide 3 of 4: Purpose: This figure orients the students to the session layer. Emphasize: This layer coordinates applications as they interact on different hosts. Examples of session-layer protocols include: NFS, SQL, RPC, and so on. Transition: The following displays the lower layers.
- Slide 4 of 4: Purpose: This figure orients the students to the entire OSI model stack. Emphasize: The lower layers sit below the upper three layers. The remainder of this course is focused on the lower layers. Transition: The following discusses the physical layer of the OSI reference model.
- Slide 1 of 5 Purpose: This figure orients the students to the physical layer of the OSI Model. Emphasize: The physical layer specifies the electrical, mechanical procedural, and functional requirements for activating, maintaining, and deactivating the physical link between systems. Certain physical standards are associated with certain data link standards. For example, 802.3 is used with data link standard 802.2 for Ethernet. It is not used in WAN connections. This is covered more in-depth later in the course. Transition: The following discusses Layer 2, the Data Link layer, of the OSI reference model.
- Slide 2 of 5: Purpose: This figure orients the students to the data link layer. Emphasize: The data link layer provides data transport across a physical link. 802.3 is and physical and data link Ethernet protocol. It is used with the 802.2 standard. Transition: The following discusses Layer 3, the network layer, of the OSI reference model.
- Slide 3 of 5: Purpose: This figure orients the students to the network layer. Emphasize: Network layer is where IP occurs. Transition: The following discusses Layer 4, the transport layer, of the OSI reference model.
- Slide 4 of 5: Purpose: This figure orients the students to the transport layer. Emphasize: The Transport layer of the OSI reference model is implemented by various protocols; one of which is TCP. TCP uses ports and encapsulates the data in ‘segments’. TCP is connection oriented so it offers reliable service. The other major transport layer protocol discussed in this course is UDP. It offers speed but no reliability because it is connectionless. Transition: The following presents the entire OSI stack again.
- Slide 5 of 5: Purpose: This figure reviews the entire OSI model stack. Emphasize: The upper layers sit above the lower layers. Transition: The following discusses encapsulation and de-encalsulation.
- Purpose: This figure illustrates encapsulation. Emphasize: The protocol data units (PDUs) are the terms used in the industry and in this course to describe data at the different layers. Encapuslation is a key concept that illustrates how data is formatted prior to being sent across a link. This example is an illustration is Ethernet (or token ring) at the data link and physical layer and TCP/IP at the network and transport layers. Transition: The following discusses de-encalsulation.
- Purpose: This figure illustrates de-encapsulation. Emphasize: At the destination, the headers at each layer are stripped off as the data moves back up the stack.
- Purpose: This exercise is intended to re-enforce students understanding of the OSI model. Note: Students should fill in the empty spaces to complete the table. Answers are in the “Answers” appendix.