data link layer in osi model pdf

... Data Link Layer Protocols- The Frame 31 ã Remember that although there are many different Data Link layer protocols that describe Data Link layer frames, each frame ... this chapter, you will be able to: ã Explain the role of Data Link layer protocols in data transmission. ã Describe how the Data Link layer prepares data for transmission on network media. ã ... very simple. ã 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...

Ngày tải lên: 22/12/2013, 13:17

... 3 “Chuyên trang dành cho kỹ thuật viên tin học” CHIA SẺ - KINH NGHIỆM - HỌC TẬP - THỦ THUẬT Part 2 - OSI Model Mô hình OSI mô tả phương thức truyền tin từ các chương trình ứng dụng của một hệ ... vụ kiên kết Lớp liên kết dữ liệu (Data link layer) Lớp này có nhiệm vụ truyền các khung dữ liệu từ máy tính này sang máy tính khác qua tầng vật lý, đảm bảo tin cậy, gửi các khối dữ liệu với các ... mình vừa giới thiệu xong phần OSI trong 70-290, 70-620 của MCSA. Công ty TNHH đầu tư phát triển tin học GC Com Chuyên trang kỹ thuật máy vi tính cho kỹ thuật viên tin học Điện thoại: (073) -...

Ngày tải lên: 27/01/2014, 12:20

... Data Link Layer Data link layer attempts to provide reliable communication over the physical layer interface. Breaks the outgoing data into frames and reassemble ... as layering. OSI Model OSI: A Layered Network Model The process of breaking up the functions or tasks of networking into layers reduces complexity. Each layer provides a service to the layer ... standards. OSI Model OSI Reference Model The OSI model is now considered the primary Architectural model for inter-computer communications. The OSI model describes how information or data makes...

Ngày tải lên: 30/03/2014, 07:20

Ngày tải lên: 21/06/2014, 22:20

Ngày tải lên: 09/08/2014, 10:22

Ngày tải lên: 23/10/2014, 21:01

Ngày tải lên: 21/08/2012, 16:18

... Session Network Data link Physical zone 1 zone 2 H2:H.323 Protocols in relation to the OSI model G.711 G.722 G.728 G.729 G.723.1.1 Presentation H.261 ... H.323 RAS signaling zone 1 zone 2 Hình 3: kiến trúc tại Terminal H.323 cña Cisco Video Conference Architecture a typical H.323 Terminal Video I/O Equipment Audio I/O Equipment User Data Applications System Control User Interface H.225.0 Layer Locall Area Network Intererface recovery Path Delay Video ... Data Applications System Control User Interface H.225.0 Layer Locall Area Network Intererface recovery Path Delay Video codec H261, H263 Audio condec G711, G722, G723, G728 G729 System control 1. Setup 2. Alerting 3....

Ngày tải lên: 24/08/2012, 21:11

Ngày tải lên: 23/08/2013, 10:37

... Activity 5.1: Identifying Keys in the Logical Model Exercise 1: Identifying Keys In this exercise, you will identify primary, foreign, and composite keys for a logical data model based on ... composite keys in the logical data model for Ferguson and Bardell, Inc. Objectives After completing this activity, you will be able to: ! Identify primary, foreign, and composite keys in ... define the composite key, and then label their types as Primary or Foreign. Next, you will discuss your answers with the class. Activity 5.1: Identifying Keys in the Logical Model In...

Ngày tải lên: 21/12/2013, 06:16

... 3. 11.2 11-1 FRAMING 11-1 FRAMING The data link layer needs to pack bits into The data link layer needs to pack bits into frames frames , so , so that each frame is distinguishable from another. ... 11.40 The send window is an abstract concept defining an imaginary box of size 2 m − 1 with three variables: S f , S n , and S size . Note 11.4 Figure 11.2 Byte stuffing and unstuffing 11.31 Algorithm ... frame is distinguishable from another. Our postal system practices a type of framing. The simple postal system practices a type of framing. The simple act of inserting a letter into an envelope...

Ngày tải lên: 16/02/2014, 20:20

... C-terminal cytosolic domain of SR-BI which is a critical domain involved in selective CE-uptake [29,53] is lacking in SR-BII and the lack of SR-BII protein in all three choriocarcinoma cell lines investigated ... containing 10% FBS, 1% glutamine and 1% penicillin/streptomycin) and CHO cells (HAMs F12 medium containing 5% (v/v) FBS, 2 m M gluta- mine, 50 UặmL )1 penicillin and 50 lgặmL )1 streptomycin) cultured ... medium containing 5% (v/v) FBS, 2 m M glutamine, 50 UặmL )1 penicillin and 50 lgặmL )1 streptomycin [36]; ldlA(mSR-BI) (ldlA7 stably transformed with mSR-BI) were maintained in medium containing 0.5...

Ngày tải lên: 20/02/2014, 23:20

... We noted during our visits a general shift in the financial services industry – including in small firms – from holding customer data in paper files to the electronic scanning and filing of correspondence. ... repeat training or testing. In addition, training for front-line staff, such as those who work in call centres, tended to focus mainly on legislative and regulatory requirements. This Data Security in ... transparent international market for stolen customer data, including data belonging to UK citizens, according to PricewaterhouseCoopers, a consulting firm. Sets of data are bought and sold freely in social...

Ngày tải lên: 06/03/2014, 19:20

... aesthetics, dataset interpretation and interaction. The proposed model is based on analysing existing visualization techniques by their interpretative intent and data mapping inspiration. ... engaging displays. Although such approaches are often inspired by art [10], they are limited to conveying only meaning embedded within the dataset itself. By obscuring data mappings behind ... form a continuum between direct mapping with intrinsic focus, and interpretive mapping with extrinsic focus. Although the model reveals a relationship between mapping technique and data focus,...

Ngày tải lên: 23/03/2014, 13:20

... though the decline in the lending rate, higher uncertainty deters individuals from taking loans, and the share of household credit in GDP declines from 14.3% to 13.4%. If individual uncertainty is low, ... model identifying both normal and boom regimes in the credit market. In turn, Rubaszek (2011) have calibrated a version of the model including housing to data on the banking sector in Poland. His ... The determinants of bank interest rate margins: An international study. Journal of International Money and Finance 19 (6), 813–832. Serwa, D., 2011. Identifying multiple regimes in the model of...

Ngày tải lên: 29/03/2014, 06:21

... improvement observed in clinical markers of disease severity. Findings Respiratory Syncytial Virus (RSV) is the main viral respira- tory pathogen causing hospitalization in infants and young children ... were intranasally inoculated with 100 àL of 10 6.5 PFU RSV-A2 or sterile 10% Eagle's minimal essen- tial medium, following institutional guidelines [5-7]. Motavizumab was administered intraperitoneally ... design, data analyses, manuscript preparation; SCB data analyses and manuscript review, and MBR per- forming experiments; JC Luminex data analysis and inter- pretation. PK and HSJ data interpretation;...

Ngày tải lên: 18/06/2014, 18:20

... is capable of interrupting CMV transmission. Since the guinea-pig model of CMV infection is the most authentic non-primate animal model for study of interventions against congenital CMV infection ... to human clinical trials. One attractive model is the guinea pig cytomegalovirus (GPCMV) model [reviewed in [6]], since the GPCMV crosses the placenta, causing infection and disease in utero. ... reporter cassette in infected cells resulted in the efficient and rapid detection of virus in experimentally inoculated animals, including congenitally infected, new- born pups. Recombinant virus was...

Ngày tải lên: 19/06/2014, 08:20

... to occur in the EAE model by administering the synthetic cannabinoid WIN 5,212-2 [23]. In the TMEV- IDD model we showed that WIN 5,212-2 at the time of virus infection inhibited brain VCAM-1 ... endocannabinoid, AEA inhibits the expression of VCAM-1 in TMEV-infected brain endothelial cells resulting in reduced leukocyte adhe- sion and crossing through an in vitro model of BBB. In the TMEV-IDD ... of injection, immunostained for VCAM-1. Arrows indicate VCAM-1 immunostaining. Scale bar is 50 μm. (B, D) Quantification of intensity of VCAM-1 staining as described in Material and methods in...

Ngày tải lên: 19/06/2014, 22:20