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OSI ModelOSI Model
CompTIA Network+
Chapter 2
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Exam Objectives
The following 4 exam objectives will be covered in this chapter.
1. Define the layers of the OSI model and identify the protocols, services, and functions that pertain to each layer.
2. Identify the OSI Model layers where routing, switching or bridging occurs.
3. Describe data link layer concepts, including MAC address, bridges and 802.x specifications.
4. Explain routing and network layer concepts.
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The Seven Layers of the OSI Model
InternationalOrganization ofStandardization
ISO
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Layer7 The application layer is the
OSI layer that is closest to the user; it provides network services to the user’s applications. It differs from the other layers in that it does not provide services to any other OSI layer, but rather, only to applications outside the OSI model. Examples of such applications are spreadsheet programs, word processing programs, and bank terminal programs. If you want to remember Layer 7 in as few words as possible, think of browsers.
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Layer 6 The presentation layer
ensures that the information that the application layer of one system sends out is readable by the application layer of another system. The presentation layer translates between multiple data formats by using a common format.
Data encryption and compression also takes place at the Presentation layer
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Layer 5 As its name implies, the
session layer establishes, manages, and terminates sessions between two communicating hosts. The session layer provides its services to the presentation layer. It also synchronizes dialogue between the two hosts' presentation layers and manages their data exchange. If you want to remember Layer 5 in as few words as possible, think of dialogues and conversations.
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Layer 4
The transport layer segments data from the sending host's system and reassembles the data into a data stream on the receiving host's system. Layer 4 is the boundary between media-layer protocols and host-layer protocols. Layer 4 also deals with Flow Control (Windowing), and Reliability of Communication (Acknowledgement).
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Layer 3
The network layer is a complex layer that provides connectivity and path selection between two host systems that may be located on geographically separated networks. If you want to remember Layer 3 in as few words as possible, think of path selection, routing, and addressing.
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Layer 2 The data link layer provides
reliable transit of data across a physical link. In so doing, the data link layer is concerned with physical (as opposed to logical) addressing, network topology, network access, error notification, ordered delivery of frames. If you want to remember Layer 2 in as few words as possible, think of frames and media access control.
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Layer 1 The physical layer defines the
electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between end systems. Such characteristics as voltage levels, maximum transmission distances, physical connectors, transceivers and other, similar, attributes are defined by physical layer specifications. If you want to remember Layer 1 in as few words as possible, think of signals and media.
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Encapsulation
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Summary of the OSI ModelLayer Description
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5 Conversion Steps to Encapsulate Data
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Devices and layers
Physical layer: Media, transceivers, hubs, and repeaters.
Data link Layer: bridges, switches, NICs and brouters
Network Layer: routers, brouters.
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Frame Specifications Ethernet
– Networking technology originally developed in 1970 by Xerox
Token Ring– Networking technology developed by IBM
in the 1980s
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Typical Ethernet Frame
802.3 Standard– IEEE standard for Ethernet networking
devices and data handling
FIGURE 2-5 Ethernet frame as specified by the IEEE 802.3 standard
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Components of the Ethernet 802.3 Frame
Preamble: announces to the network that data is in rout.
Start of Frame Delimiter (SFD): beginning of the addressing frame
Destination Address Source Address
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Components of the Ethernet 802.3 Frame
Length (LEN) Data Pad: Minimum frame size is 46 bytes Frame Check Sequence (FCS)
– Cyclic Redundancy Check (CRC)• Algorithm used to verify the accuracy of data
contained in a data frame
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Standardized four Ethernet Frame Types
Ethernet 802.2 Ethernet 802.3 Ethernet II Ethernet SNAP
– The four frames are not compatible with each other.
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Typical Token Ring Frame
802.5 Standard– IEEE standard for Token Ring networking devices
and data handling
FIGURE 2-6 Typical Token Ring frame as specified in the IEEE 802.5 standard
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Components of Token Ring Frame
Start Delimiter (SD) Access Control (AC) Frame Control (FC) Destination Address Source Address
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Components of Token Ring Frame
Data
Frame Check Sequence (FCS)
End Delimiter (ED)
Frame Status (FS)
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Addressing Through the Layers
Data Link Layer Address
Network Layer Address
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Data Link Layer Address
Also called MAC address, after Media Access Control (MAC) sublayer
Number uniquely defining a network node Manufacturer-hard codes the address
– Block ID– Device ID
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Network Layer Address
Resides at Network level of OSI Model Follows hierarchical addressing scheme Can be assigned through operating system
software
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IEEE Networking Specifications
IEEE 802 standards
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IEEE Networking Specifications
To accommodate shared access for multiple network nodes, the IEEE expanded the OSI Model by separating the Data Link layer into two sublayers– Logical Link Control (LLC) sublayer– Media Access Control (MAC) sublayer
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Data Link Layer Sublayers
LLC – Upper Sublayers– Provides common interface– Supplies reliability and flow control services
MAC– Lower sub layer– Appends the physical address of the
destination computer onto the frame
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Subdivided Data Link Layer
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Labs and Homework
Labs:– 2.2– 2.4– 2.5
Homework– End of chapter review questions (30 Multiple
choice questions.)
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OSI Model Network+ Exam Questions
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Question 1
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Question 2
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Question 3
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Question 4
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Question 5
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Question 6
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Question 7
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Question 8
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Question 9
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Question 10
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Question 12
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Question 13
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Question 14
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Question 15
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Question 16
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Question 17
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Question 18
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Question 19
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Question 20
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Question 21
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Question 22
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Question 23
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Question 24
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Question 25
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Question 26
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Question 27
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Question 28
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Question 29
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Question 30
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Question 31
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Question 32
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Question 33
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Question 34
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Question 35