the data link layer by behrouz forouzan ppt

... Chapter The Data Link Layer Data Link Layer Design Issues • • • • Services Provided to the Network Layer Framing Error Control Flow Control Functions of the Data Link Layer • • • Provide ... Example Data Link Protocols • HDLC – High-Level Data Link Control • The Data Link Layer in the Internet High-Level Data Link Control Frame format for bit-oriented protocols High-Level Data Link ... ranh) by flag bytes (b) Four examples of byte sequences before and after stuffing Framing (3) Bit stuffing (a) The original data (b) The data as they appear on the line (c) The data as they are

Ngày tải lên: 21/12/2017, 11:48

... 39 Example Data Link Protocols • HDLC – High-Level Data Link Control • The Data Link Layer in the Internet 40 CuuDuongThanCong.com https://fb.com/tailieudientucntt High-Level Data Link Control ... Chapter The Data Link Layer CuuDuongThanCong.com https://fb.com/tailieudientucntt Data Link Layer Design Issues • • • • Services Provided to the Network Layer Framing Error Control ... https://fb.com/tailieudientucntt Functions of the Data Link Layer • • • Provide service interface to the network layer Dealing with transmission errors Regulating data flow • Slow receivers not swamped by fast senders CuuDuongThanCong.com

Ngày tải lên: 14/12/2021, 07:14

... mode f the way devices are connected with each other and to the links The data link layer is responsible for a framing data bits b providing the physical addresses of the sender/receiver c data ... address is the local address of a node; it is used by the data link layer to deliver data from one node to another within the same network The logical address defines the sender and receiver at the ... sent back to the source in this case 25 The errors between the nodes can be detected by the data link layer control, but the error at the node (between input port and output port) of the node cannot

Ngày tải lên: 12/04/2023, 21:01

... and denote the same by 1 Upon the one side of a right angle, lay off from the vertex O the segment 1 and also the segment b Then, from O lay off upon the other side of the right ... called the interior of the angle (h, k) To distinguish the other region from this, we call it the exterior of the angle (h, k) The half rays h and k are called the sides of the ... points and designate them by the letters A, B, C,. . . ; those of the second, we will call straight lines and designate them by the letters a, b, c,. . . ; and those of the third system, we will

Ngày tải lên: 28/06/2014, 19:20

... Building the Data Warehouse was printed, the database theorists scoffed at the notion of the data warehouse One theoretician stated that data warehousing set back the information ... Structuring Data in the Data Warehouse The Data Warehouse and Design 81 Beginning with Operational Data 82 Data/ Process Models and the Architected Environment 87 The Data ... The Data Warehouse and Data Models 89 92 94 98 The Data Warehouse Data Model The Midlevel Data Model The Physical Data Model TE viii The Data Model and Iterative Development

Ngày tải lên: 08/08/2014, 21:23

... integrated data; in other cases, there is very little The global data warehouse contains historical data, as do the local data warehouses The source of the data for the local data ... the basic structure of data itself, and includes such things as these: ■■ The structure of data ■■ The encoding of data ■■ The naming conventions used for data ■■ The metrics describing the data, ... which data goes into the global data warehouse, the structure of the data, and any conversions that must be done The mapping is the most important part of the design of the

Ngày tải lên: 08/08/2014, 22:20

... Trang 1A note on the use of these ppt slides:We’re making these slides freely available to all (faculty, students, readers) They’re in powerpoint form so you can add, ... liệu hay cờ? ˆ Bên gửi: “nhồi” thêm một byte <01111110> vào sau mỗi byte Trang 37Minh họa nhồi byte trong PPPTrang 38Sự hoạt động của giao thức PPPTrước khi trao đổi dữ liệu tầng mạng, ... mạng cần cân nhắc các yếu tố: Trang 8Truyền thông giữa các bộ thích ứng mạngframe datagram rcving node link layer protocol sending node frame adapter adapter  thêm thông tin điều khiển và kiểm

Ngày tải lên: 23/10/2014, 21:01

... LAN Features for OSI Layer 1  The OSI physical layer, or Layer 1, defines the details of how to move data from one device to another.  The OSI physical layer defines the standards used to ... Typical LAN Features for OSI Layer 2 5 Data Link Function 1: Arbitration  The specifications for these data-link protocols define how to arbitrate the use of the physical medium to avoid ... administered by the IEEE, identify the manufacturer or vendor. The remaining six hexadecimal digits comprise the interface serial number. 9 Using MAC addresses A DData A DData A DDataA DData Source

Ngày tải lên: 12/08/2015, 09:13

... max window Trang 424 2Trang 43 Data Link Control Protocols  The data link control layer is concerned with the transfer of dataover a serial data link The link can be:  point‐to‐point physical ... the data link The most important layer are flow control and error control Collectively, these functions are known as data link control. procedures used to restrict the amount of data that the ... Determine the link efficiency for the following type of data link if the velocity of propagation is 2.108 m/s and the bit error rates of the links are all negligibly low: 3 2 Trang 33Example of link

Ngày tải lên: 04/12/2016, 08:57

... Attack • Clients authenticate themselves to access points prior to association with the network • Authentication typically occurs over unencrypted layer management frames • De-authentication also ... addresses are leased from a DHCP server after a request by a client The lease allows the client to use the specified address for a period of time • By sending 254 DHCP Requests, a DHCP starvation DHCP ... def monitorPackets(p): if p.haslayer(Dot11): if (p.getlayer(Dot11).subtype==8): ssid = p.getlayer(Dot11).info bssid = p.getlayer(Dot11).addr2 stamp = str(p.getlayer(Dot11).timestamp) prev = ssidDict[bssid][len(ssidDict[bssid])-1])

Ngày tải lên: 12/09/2017, 01:26

... Functions of a LAN • Data and applications • Share resources • Provide communication path to other networks LAN Sizes LAN Standards Ethernet Frame Structure Communicating Within the LAN MAC Address ... Understanding Ethernet BSCI v3.0—2-1 Local Area Network LAN Components • Computers – PCs – Servers • Interconnections – NICs – Media • Network devices – Hubs – Switches – Routers • Protocols – Ethernet

Ngày tải lên: 08/11/2019, 18:10

... kết liệu (Data Link layer) A note on the use of these ppt slides: We’re making these slides freely available to all (faculty, students, readers) They’re in PowerPoint form so you see the animations; ... thơng: links  Kết nối có dây (wired links)  Kết nối không dây (wireless links)  LANs  Gói liệu lớp 2: frame, đóng gói datagram Tầng data-link có nhiệm vụ truyền datagram từ node đến node lân cận ... application transport network link cpu memory controller link physical host bus (e.g., PCI) physical transmission network adapter card Tầng Link 5-8 Các Adaptor liên lạc datagram datagram controller controller

Ngày tải lên: 25/02/2023, 15:51

... restrict the amount of data that the sender can send before waiting for acknowledgment Error control in the data link layer is based on automatic repeat request, which is the retransmission of data ... see how the data link layer can combine framing, flow control, and error control to achieve the delivery of data from one node to another The protocols are normally implemented in software by using ... Flow and Error Control The most important responsibilities of the data link layer are flow control and error control Collectively, these functions are known as data link control Flow control

Ngày tải lên: 12/04/2023, 21:00

... Acces Layer (Lớp truy nhập mạng) tơng ứng với physical layer & Data link layer OSI + Internetwork layer: định tuyến gói liệu máy chủ + Host to host layer: kết nối thành phần mạng + Application layer: ... (International Telecommunication Union - Hiệp hội viễn thông quèc tÕ) Physical layer: X21, X21 bis Data link layer: LAP-B Network layer: X25 - TCP/IP (Transmission Control Protocol/Internet protocol): ... IXP tuân theo chuẩn OSI, hoạt động tầng mạng, chịu trách nhiệm thiết lập địa cho thiết bị mạng Nó giao thức định tuyến, kết hợp với giao thức routing information protocol (RIP) netware link protocol

Ngày tải lên: 19/06/2023, 11:23

... Module 8 is the first of two modules that focus on the data access layer (DAL): Module 8, “The Nontransactional Data Access Layer” and Module 9, “The Transactional Data Access Layer.” The DAL is ... User Services Data Services The data services store and manage all of the data used by the system. Access to the data services requires detailed knowledge of where and how the data is stored. ... which is to buffer all other layers from the data services layer. The section also emphasizes the need to split the DAL into nontransactional and transactional layers to define the proper boundaries

Ngày tải lên: 21/12/2013, 06:17

... between the nodes of a network independent of their physical layout. – These logical signal paths are defined by Data Link layer protocols. • The Data Link layer "sees" the logical ... 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 the different types ... 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...

Ngày tải lên: 22/12/2013, 13:17

... > Timeline > Layer to create a new layer. Select Modify > Timeline > Layer Properties and change the name of the layer to Sound. 7 Select the Down frame in the Sound layer and insert ... click the Simulator keys with your mouse and the keys will operate in the same way as they would on an actual i-mode phone. The Select key is the key with a circle icon, surrounded by the arrow ... add a new Keyframe to the new Actions layer. 14 Click on the first Keyframe on the Actions layer and in the Actions window enter the following script: stop(); Note: If the Actions window is...

Ngày tải lên: 14/12/2013, 14:15

... again. Then I felt the rest of the chain reaction the sad feelings of his family when they realized they would be without their provider.[56-D] Even though he had not killed them directly, the Being ... According to them, ten of Harold’s foreign words were of Old Norse, the language of the Vikings and the precursor of modern Icelandic, and these words were actually used by the Vikings. The other twelve ... of smoke toward the ceiling where I was hovering. I sensed that they were there to take the body to the morgue. Before they reached the dead man, my buddy Tommy came through the door and stationed...

Ngày tải lên: 24/12/2013, 13:15