data link layer ppt cisco

... Data Link Layer Protocols- The Frame 31 • Remember that although there are many different Data Link layer protocols that describe Data Link layer frames, each frame ... logical signal paths are defined by Data Link layer protocols. • The Data Link layer "sees" the logical topology of a network when 24 • The Data Link layer "sees" the logical ... chapter, you will be able to: • Explain the role of Data Link layer protocols in data transmission. • Describe how the Data Link layer prepares data for transmission on network media. • Describe...

Ngày tải lên: 22/12/2013, 13:17

Ngày tải lên: 16/02/2014, 08:20

... trường hợp về sự cố mạng có thể do phần cứng hay phần mềm: Phần cứng (Lớp Physical, Data Link) : Đèn liên kết (Link ) của card mạng không sáng Kiểm tra đầu nối card mạng và đầu cáp nối trên HUB/SWITCH ...

Ngày tải lên: 23/12/2013, 03:17

Ngày tải lên: 18/01/2014, 05:20

Ngày tải lên: 26/01/2014, 10:20

... with other frames sent in [t 0 -1,t 0 +1] 5: DataLink Layer 5-2 Chapter 5: The Data Link Layer Our goals: ❒ understand principles behind data link layer services: ❍ error detection, correction ❍ sharing ... etc ❍ extracts datagram, passes to rcving node ❒ adapter is semi- autonomous ❒ link & physical layers sending node frame rcving node datagram frame adapter adapter link layer protocol 5: DataLink Layer ... channel: multiple access ❍ link layer addressing ❍ reliable data transfer, flow control: done! ❒ instantiation and implementation of various link layer technologies 5: DataLink Layer 5-49 Star topology ❒ Bus...

Ngày tải lên: 12/09/2012, 15:06

... + HF – (thoại tương tự) + VHF Data link: VDL Mode2 – (dữ liệu), VDL mode3 - (thoại và dữ liệu), và VDL mode4 - (dữ liệu). + SSR Mode S - (dữ liệu) + HF Data link – (dữ liệu). Các dịch vụ thông ... trên vùng lãnh thổ Việt Nam. Luận văn “ ỨNG DỤNG CỦA VHF DATA LINK MODE 4 TRONG MÔI TRƯỜNG CNS/ ATM ” nghiên cứu công nghệ kỹ thuật VHF Data Link Mode 4, một liên kết dữ liệu số sử dụng sóng VHF ... phân lớp điều khiển truy nhập MAC ( Medium Access Control ), Dịch vụ liên kết dữ liệu DLS ( Data Link service ) và thực thể quản lý liên kết ( LME ). Lớp liên kết dữ liệu VDL cung cấp sự truyền...

Ngày tải lên: 22/11/2012, 09:13

Ngày tải lên: 23/08/2013, 10:37

... CHAPTER 8 ■ DATA ACCESS LAYER 174 private void DisconnectFromDatabase() { if (_databaseConnection.State != ConnectionState.Open) { _databaseConnection.Close(); } } private IDataReader ... CreateUserFromReader(IDataReader dataReader) { int id = dataReader.GetInt32(0); string name = dataReader.GetString(1); string emailAddress = dataReader.GetString(2); string password = dataReader.GetString(2); ... the project, only the parts of the database that are in use by the object model should have been generated. CHAPTER 8 ■ DATA ACCESS LAYER 164 DATABASE KEYS Database tables should always have...

Ngày tải lên: 03/10/2013, 01:20

... modules that focus on the data access layer (DAL). In Module 8, “The Nontransactional Data Access Layer, ” you learned about data retrieval. In this module, you will learn about data manipulation. ... same data access technologies as that of the nontransactional DAL. The following data access technologies were covered in Module 8, “The Nontransactional Data Access Layer : ! Microsoft Data ... DAL: Module 8, “The Nontransactional Data Access Layer and Module 9, “The Transactional Data Access Layer. ” The DAL is an application’s means of access to data services. After completing this...

Ngày tải lên: 05/11/2013, 12:15

... BASED DATA MINING TECHNIQUES The objective of data mining is to extract valuable information from one’s data, to discover the ‘hidden gold’. In Decision Support Management terminology, data mining ... one search for patterns of information in data (Parsaye, 1997). Figure 2: Rule Induction process Data mining techniques are based on data retention and data distillation. Rule induction models ... rule induction data mining. Furthermore, it is examined whether the implementation of the two methodologies may offer a solution to the problem of missing data, in the initial data set. KEYWORDS:...

Ngày tải lên: 11/12/2013, 23:15

... watermark. 2 Huffman Coding Huffman coding is a popular method for compressing data with variable-length codes. Given a set of data symbols (an alphabet) and their frequencies of occurrence (or, equiv- alently, ... the compressed data on a file, the variance of the code makes no difference. A small-variance Huffman code is preferable only in cases where the encoder transmits the compressed data, as it is being ... starts with a special header indicating mode 1, followed by the length LEN of the data, followed by LEN bytes of literal data. Notice that the maximum value of LEN is 65,535. 2. Compression with fixed...

Ngày tải lên: 14/12/2013, 15:15

... test data set (top) and an 85.8283% accuracy in the test data for the prepared data set (bottom). 12.4 Practical Use of Data Preparation and Prepared Data How does a miner use data ... working with the data. When the data is easy to model, better models come out faster, which is the technical purpose of data preparation. How does data preparation make the data easier to work ... Data preparation looked at here has dealt with data in the form collected in mainly corporate databases. Clearly this is where the focus is today, and it is also the sort of data on which data...

Ngày tải lên: 15/12/2013, 13:15

... what does data preparation alone achieve in this data set? In order to demonstrate that, we will look at two models of the data one on prepared data, and the other on unprepared data. ... Data preparation looked at here has dealt with data in the form collected in mainly corporate databases. Clearly this is where the focus is today, and it is also the sort of data on which data ... the effects of data preparation: normalization of data range (left), and normalization and redistribution of data set (right). 12.3.1 Neural Networks and the CREDIT Data Set ...

Ngày tải lên: 15/12/2013, 13:15

Ngày tải lên: 20/12/2013, 22:15

... BLANK 74 Activity 9.4: Identifying Data Access Requirements Exercise 1: Identifying a Data Access Method for a Scenario (10 minutes) ! Identify data access requirements 1. Participate ... 9.4: Identifying Data Access Requirements In this activity, you will first identify the optimal data access method to use in a given situation. Next, you will analyze the data access method ... All data for a new order entry system is going to be stored in Microsoft ® SQL Server ™ and accessed by Microsoft Excel for querying and by the Web system for additional lookups. All data...

Ngày tải lên: 21/12/2013, 06:16

... Nontransactional Data Access Layer 15 Data Shaping Service ! Relation-based Hierarchical Rowsets ! Group-based Hierarchies ! Using Data Shaping ! Sample Definition OLE DB provides a Data Shaping ... is any component that owns data. It exposes its data in a tabular format, regardless of the format in which it stores data. Examples of data providers are relational database management systems ... Nontransactional Data Access Layer # ## # Introduction to the Data Access Layer ! The Business Problem ! Splitting the DAL The DAL buffers the entire system from the underlying data services....

Ngày tải lên: 21/12/2013, 06:17

... you want to consolidate data. ¤ Click Data ➪ Consolidate. ■ The Consolidate dialog box displays. ‹ Click the function you want to perform. Sum I f you have related data values in multiple ... combine different workbooks containing sales data for the year into one consolidated worksheet so that you can analyze all the data. Before you merge your data values, you must first decide where ... worksheet, or open another workbook and select the range of cells. CONSOLIDATE DATA EXCEL DATA ANALYSIS 36 CONSOLIDATE DATA 03 537547 Ch02.qxd 3/4/03 11:47 AM Page 36 ■ A list of current custom...

Ngày tải lên: 22/12/2013, 23:16

... database files. You can perform a database query to access an external database and import the desired data values. See Chapter 5 for more information on working with external data sources. Data ... 90 Create a Web Query 92 Import a Database Table 94 Using Queries to Screen External Databases 96 Find the Average of a Database Range 102 Save For Web 104 6) CHARTING DATA Chart Basics 106 Modify ... 24 2) ORGANIZE WORKSHEET DATA Create a List 26 Add a Series to a List 28 Sort a List 30 Create a Custom Sort 32 Consolidate Data 36 Outline Your Data 40 3) EVALUATE WORKSHEET DATA Apply Conditional...

Ngày tải lên: 22/12/2013, 23:16

Ngày tải lên: 24/12/2013, 07:17