Learning objectives of this chapter include: Understand the architecture of the OSI model, understand the layers of the OSI model and their functions, understand the architecture of the TCP/IP Protocol Suite, differentiate between the OSI model and the TCP/IP Suite, differentiate between the three types of Internet addresses.
Responsible for program to program communication
• Provides services directly to applications, such as electronic mail, file transfer and terminal
• Responsible for identifying and establishing the availability of the intended partner and
• Responsible for determining if sufficient communication resources exist to reach the remote
This diagram illustrates the Physical layer (Layer 1) of the OSI model. The Physical layer is responsible for the ultimate transmission of data over network communications media. It operates with data in the form of bits that are sent from the Physical layer of the sending (source) device and received at the Physical layer of the destination device. Ethernet cabling, Token Ring network technology and SCSI all function at the Physical layer of the OSI model. Hubs and other repeaters are standard network devices that function at the Physical layer.
Chapter 2 introduce Networking standards and the OSI model. This chapter objectives: Identify organizations that set standards for networking, describe the purpose of the OSI model and each of its layers, explain specific functions belonging to each OSI model layer,...
The two dominant networking models are the Open Systems Interconnection (OSI) and the Internet model (TCP/IP).The first is a theoretical framework; the second is the actual model used in today's data communications. In Chapter 2, we first discuss the OSI model to give a general background. We then concentrate on the Internet model, which is the foundation for the rest of the lecture.
Chapter 2 - The OSI model and the TCP/IP protocol suite. Upon completion you will be able to: Understand the architecture of the OSI model, understand the layers of the OSI model and their functions, understand the architecture of the TCP/IP Protocol Suite, differentiate between the OSI model and the TCP/IP Suite, differentiate between the three types of Internet addresses.
The Open Systems Interconnection (OSI) model is a reference tool for understanding data communications between any two networked systems. It divides the communications processes into seven layers. Each layer both performs specific functions to support the layers above it and offers services to the layers below it. The
three lowest layers focus on passing traffic through the network to an end system. The top four layers come into play in the end system to complete the process.
This lab will help to develop a better understanding of the seven layers of the OSI model. Specifically
as they relate to the most popular functioning networking model in existence, the TCP/IP model. The
Internet is based on TCP/IP. TCP/IP has become the standard language of networking. However,
the seven layers of the OSI model are the ones most commonly used to describe and compare
networking software and hardware from various vendors. It is very important to know both models
and be able to relate or map the layers of one to the other.
Networking Standards and the OSI Model
Identify organizations that set standards for networking.
Describe the purpose of the OSI Model and each of its layers
Explain specific functions belonging to each OSI Model layer
Understand how two network nodes communicate through the OSI model
Discuss the structure and purpose of data packets and frames.
Describe the two types of addressing covered by the OSI Model.
Identify the characteristics of TCP/IP, IPX/SPX, NetBIOS, and AppleTalk
Understand how network protocols correlate to layers of the OSI Model
Identify the core protocols of the TCP/IP suite and describe their functions
Identify the well-known ports for key TCP/IP services
Understand addressing schemes for TCP/IP, IPX/SPX, NetBEUI, and AppleTalk
Describe the purpose and implementation of DNS (Domain Name System) and WINS (Windows Internet Naming Service)
Install protocols on Windows XP clients...
Networking Hardware Identify the functions of LAN connectivity hardware
Install and configure a NIC (Network Interface Card)
Identify problems associated with connectivity hardware Describe the factors involved in choosing a NIC, hub, switch, or router
Discuss the functions of repeaters, hubs, bridges, switches, routers, and gateways, and the OSI Model layers at which they operate
Describe the use and types of routing protocols
Data can be corrupted during transmission. For reliable
communication, error must be detected and corrected
are implemented either at the data link layer or the
transport layer of the OSI model.Error detection uses the concept of redundancy, which
means adding extra bits for detecting errors at the
Chapter 3 Application Layer Functionality and Protocols
Describe how the functions of the three upper OSI model layers provide network services to end user applications. Describe how the TCP/IP Application Layer protocols provide the services specified by the upper layers of the OSI model. Define how people use the Application Layer to communicate acrossthe information network. Describe the function of well-known TCP/IP applications, such as the World Wide Web and email, and their related services (HTTP, DNS,SMB, DHCP, STMP/POP, and Telnet).
Upon completion of this lesson, the successful participant will be able to understanding the Host-to-Host Communications Model, understanding why a Layered Network Model, understanding the seven layers of the OSI Model,... Inviting you to refer.
Tầng 1: Tầng vật lý (Physical Layer)
Tầng vật lý định nghĩa tất cả các đặc tả về điện và vật lý cho các thiết bị. Trong đó bao gồm bố trí của các chân cắm (pin), các hiệu điện thế, và các đặc tả về cáp nối (cable). Các thiết bị tầng vật lý bao gồm Hub, bộ lặp (repeater), thiết bị tiếp hợp mạng (network adapter) và thiết bị tiếp hợp kênh máy chủ (Host Bus Adapter)- (HBA dùng trong mạng lưu trữ (Storage Area Network)).
Describe the structure of a network, including the devices and media that are necessary for successful communications. Explain the function of protocols in network communications. Explain the advantages of using a layered model to describe network functionality. Describe the role of each layer in two recognized network models: The TCP/IP model and the OSI model. Describe the importance of addressing and naming schemes in network communications.
Application Layer Functionality and Protocols. In this chapter, you will learn to:
Describe how the functions of the three upper OSI model layers provide network services to end user applications.
Describe how the TCP/IP Application Layer protocols provide the services specified by the upper layers of the OSI model.
Define how people use the Application Layer to communicate across the information network.
Describe the function of well-known TCP/IP applications, such as the World Wide Web and email, and their related services (HTTP, DNS, SMB, DHCP, SMTP/POP, and Telnet)....
A computer network is the infrastructure that allows two or more computers (called
hosts) to communicate with each other. The network achieves this by providing a set
of rules for communication, called protocols, which should be observed by all
participating hosts. The need for a protocol should be obvious: it allows different
computers from different vendors and with different operating characteristics to
‘speak the same language’.
This chapter introduces the fundamental concepts of computer networks.
A networking firewall is a logical barrier designed to prevent unauthorized
or unwanted communications between sections of a computer network.
Linux-based firewalls besides being highly customizable and versatile are also
robust, inexpensive, and reliable.
The two things needed to build firewalls and QoS with Linux are two packages
named netfilter and iproute. While netfilter is a packet-filtering framework included
in the Linux kernels 2.4 and 2.6, iproute is a package containing a few utilities that
allow Linux users to do advanced routing and traffic shaping....
Packet Switched Technologies
In the same way we started with the transmission infrastructure for circuit switched technologies, packet switching has a similar underlying infrastructure. At this stage, it is worth reviewing the International Standards Organisation’s Open Systems Interconnect model (ISO-OSI) that was used in Chapter 1 as a framework for the telephony signalling protocols (Figure 5.1).