data link layer ppt in computer networks

... 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 ... very simple. • In point-to-point networks, if data can only flow in one direction at a time, it is operating as a half-duplex link. If data can successfully flow across the link from each node ... this 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. •...

Ngày tải lên: 22/12/2013, 13:17

... Balanced (LAPB)  Part of X.25 (ITU-T)  Subset of HDLC - ABM  Point to point link between system and packet switching network node  Link Access Procedure, D-Channel  ISDN (ITU-D)  ABM  Always ... i  Transmitter goes back to frame i and retransmits William Stallings Data and Computer Communications Chapter 7 Data Link Control Cyclic Redundancy Check  For a block of k bits transmitter ... - Diagram Flow Control  Ensuring the sending entity does not overwhelm the receiving entity  Preventing buffer overflow  Transmission time  Time taken to emit all bits into medium  Propagation...

Ngày tải lên: 16/02/2014, 08:20

Ngày tải lên: 21/06/2014, 20:20

Ngày tải lên: 27/06/2014, 01:21

... 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 ... tra kết nối vật lý – Click nút Start -> Run -> gõ lệnh cmd cửa sổ command line hiện ra -> gõ lệnh ping đến địa chỉ IP của Default gateway mạng đơn vị mình ( Default gateway mạng 172.28.x.0 ... là 172.28.111.1 – Nếu thành công qua bước 2. – Nếu không thành công : + Xem xét lại thông tin cấu hình mạng đã đúng chưa. Nếu sai thì thay đổi lại cho đúng và thử lại bước 1. ...

Ngày tải lên: 23/12/2013, 03:17

... Configurable Congestion Control in Data Transport Services Yunhong Gu and Robert L. Grossman Laboratory for Advanced Computing National Center for Data Mining University of Illinois at Chicago November ... Work  Keep improving  More built -in congestion control package  More configuration abilities (e.g., data reliability and timeliness) 1 :: 23 udt.sourceforge.net Supporting Configurable Congestion ... :: 23 udt.sourceforge.net Similarity and Overhead  CTCP vs. Linux TCP  Aggregate throughput  Jain’s fairness index  Stability index (standard deviation) Flow # Throughput Fairness Stability TCP...

Ngày tải lên: 15/01/2014, 15:59

... different online registers or databases con- taining personal information may be combined by powerful search engines in order to get an apprehension about groups of individuals. In effect, this informa- tion ... privacy-enhancing technologies. Information networks serve as the context in which privacy is investigated. Within information networks, the concepts of information ecosystems and con- tamination are introduced. ... and several startups joined in creat- ing Internet products and services. By the beginning of 2000, the Internet was supporting a great number of popular applications, including typical killer appli- cations...

Ngày tải lên: 16/01/2014, 16:33

... [3] Douglas E. Comer, Internetworking with TCP/IP Vol. I: Principles, Protocols, and Architecture, Fourth Edition – Prentice Hall 2000 [4] William Stalling, Data and Computer Communications, ... liên kết (connection- oriented)  Kết n ối điểm - điểm (point-to-point) và kết nối đa điểm (point-to-multi-point, multipoint-to-multipoint) 1.4. Mô hình tham chiếu và giao thức trên mạng 1.4.1. ... Learning bridge 3.2.3. Thuật toán cây spanning 3.3. Source routing bridge 3.3.1. Pure source routing bridge − Nguyên tắc chung − Thuật toán 3.3.2. SR-TB (Source routing to transparent bridging)...

Ngày tải lên: 24/01/2014, 04:20

... Computer Networks Copyright ©2006 Global Knowledge T raining LLC. All rights reserved. Page 2 Layer 5 – The Session Layer Layer 5, the session layer, provides various services, including tracking ... four layers to perform the functions of the seven -layer OSI model. The network access layer is functionally equal to a combination of OSI physical and data link layers (1 and 2). The Internet layer ... the founder and president of NeuroLink, Ltd., an international coaching and education com- pany specializing in professional development. NeuroLink’ s client list includes Cisco, AT&T, Lucent,...

Ngày tải lên: 24/01/2014, 09:20

... transitions a link to forwarding only if it is a point-to-point link. A point-to-point link is determined when the link is in full-duplex mode. 76736 MST Region CST 3-8 Cisco AVVID Network Infrastructure: ... a shared link to forwarding. Slowly is defined as a wait time of twice the fwd-delay in seconds. A shared link is a half-duplex link. RSTP also slowly transititions a link to forwarding if a ... results in PC A not being able to send data to PC B. Issuing the show command reveals that Bridge B is blocking its link to Bridge A in VLAN 10, as shown in Figure 3-16. Figure 3-16 Interruption in...

Ngày tải lên: 24/01/2014, 10:20

... from the COM tab in Visual Studio .NET's Add Reference Dialog. The sample code contains a single event handler: Data Link Dialog Button.Click Creates and displays a Data Link Properties ... Recipe 1.13 Using the Data Link Properties Dialog Box Problem You want to display the Data Link Properties dialog b ox from an application so that users can create their own database connections ... they can from the Server Explorer window in the Visual Studio .NET IDE. Solution Use COM interop with the OLE DB Service Component to display the Data Link Properties dialog box. You'll...

Ngày tải lên: 26/01/2014, 10:20

... quantitative data and permit the cost-effective assembly of large, high- quality data sets. Discussion Quantitative data generation is becoming increasingly important for obtaining insight into the ... protein standard depicted in Fig. 1. Smoothing spline curves through original and normalized data are shown as solid lines. M. Schilling et al. Strategies for standardizing quantitative data FEBS ... bio- chemical data. We use the erythropoietin receptor (EpoR)-induced activation of ERK1 in the hematopoietic suspension cell line, BaF3-hemaglutinin-tagged (HA)-EpoR, and the interleukin-6 (IL-6)-induced...

Ngày tải lên: 19/02/2014, 07:20

... of paralinguistic code structure in computer conferencing. Moreover, the findings do not suggest that a clear code exists for the community of users. Rather, the code appears to be in a stage ... determining usage. The findings serve more to define questions for subsequent study than to provide answers about user variations. In addition, It is clear that the characteristics of the computer ... tonal and expressive informa- tion. Second, it is not easy to communicate this information. Users must work in computer conferencing to communicate information about their feelings and state of...

Ngày tải lên: 24/03/2014, 01:21

... integration, is undefined. If the integration interval a ~ b includes the integration of over this interval is 1 ; if lies outside of the integration interval, the integration of over the interval is ... question underpinning this book in perspective. Referring to Figure 1.1, in the beginning of telecommunications, there were in general two separate networks, one for voice and one for data. Each network ... consisting of two random experiments, “throwing a die” and “throwing a coin.” A player is to throw the die twice and the coin once. A player who gets the face with one spot in both die-throwings...

Ngày tải lên: 01/06/2014, 12:38

... channel results in a more pronounced coding gain than increasing the frequency diversity in the relay-to-destination channel, as Scenario 3 has a lar- gercodinggainthanScenario2inFigure3.Asshown by ... two methods. In examining the power gain of best relay selection over the othe r two relaying strategies, we note an interesting trend. When the fading channels contain L = 2 taps, the power gain of ... are Hermitian, Weyl’s Inequality [29, Theorem 4.3.1] gives λ eff,min ≥ λ sd,min + λ r m d,min . (42) Since l sd,min >0and λ r m d,min > 0 again due to [28, Lemma IV.1], we have l eff,min >0andthus H H e ff H ef f is invertible....

Ngày tải lên: 20/06/2014, 22:20

... SS (uplink traffic) and in the BS (downlink and uplink traffic). However, in this study, it is being addressed the scheduling packets for the uplink traffic in the BS. The uplink scheduling is ... than downlink scheduling. In the downlink scheduling, the BS has com- plete knowledge of the queue status and the BS is the only one that transmits during the downlink subframe. The data packets ... methodology used to define the system capacity is the same defined in [25], assuming 40% of the system capacity for downlink and 60% for uplink. Table 1 shows the main parameters used in the simulation. The...

Ngày tải lên: 20/06/2014, 22:20

... unfairness by reducing the chances of transmission for the sending stations in the way of increasing the minimum conten- tion window size. The downlink compensation access (DCA) algorithm in [16] gives ... wireless link error scenario comes into play in order to see whether the fairness is supported in t ime-varying unreliable wireless link, whi ch is to ver ify the role of ω s i in calculating per-location ... Analytical modeling of TCP clients in Wi-Fi hot spot networks, in Proceedings of IFIP Networking (2004) 36. S Choi, K Park, C Kim, Performance impact of inter -layer dependency in infrastructure...

Ngày tải lên: 21/06/2014, 00:20

Ngày tải lên: 21/06/2014, 11:20

Ngày tải lên: 21/06/2014, 17:20

Ngày tải lên: 21/06/2014, 22:20