data link layer fundamentals ethernet lans

... OverviewChapter 03 Data Link Layer Fundamentals: Ethernet LANs Trang 2Table of Content1 Typical LAN Features for OSI Layer 1 2 Typical LAN Features for OSI Layer 2 3 Early Ethernet Standards 4 Recent Ethernet ... addressesTrang 10Data Link Function 3: Error Detection Most data-link protocols include a frame check sequence (FCS) or cyclical redundancy check (CRC) field in the data-link trailer This ... physical network. Trang 42 Typical LAN Features for OSI Layer 2 Trang 5Data Link Function 1: Arbitration The specifications for these data-link protocols define how to arbitrate the use of the...

Ngày tải lên: 12/08/2015, 09:13

... v3.0—2-1Understanding Ethernet Trang 2Local Area NetworkTrang 3LAN Components• Computers – PCs – Servers • Interconnections – NICs – Media • Network devices – Hubs – Switches – Routers • Protocols – Ethernet ... Ethernet – IP – ARP – DHCP Trang 4Functions of a LANTrang 5LAN SizesTrang 6LAN StandardsTrang 7Ethernet Frame StructureTrang 8Communicating Within the LANTrang 9MAC Address ComponentsTrang 10MAC...

Ngày tải lên: 20/04/2018, 23:48

... 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 ... Ethernet – IP – ARP – DHCP Functions of a LAN • Data and applications • Share resources • Provide communication path to other networks LAN Sizes LAN Standards Ethernet Frame Structure Communicating Within...

Ngày tải lên: 08/11/2019, 18:10

... 35 Data Link Layer Protocols- The Frame Trang 36 Data Link Layer Protocols- The Frame HHH] BACHKHOA NETWORKING ACADEMY Ethernet Protocol A Common Data Link Layer Protocol for LANs Frame biel ... Application Presentation Session Transport Network Data Link Physical Frame Media Data Link Layer Terms PDU Qo a aa koef a A PDU at the Data Link layer is called a frame A node is a device on a ... the Data Link Layer ISO: HDLC (High Level Data Link Control) 802.2 (LLC), IEEE: 802.3 (Ethernet) 802.5 (Token Ring) 802.11 (Wireless LAN) Q.922 (Frame Relay Standard) ITU: Q.921 (ISDN Data Link...

Ngày tải lên: 22/12/2013, 13:17

... 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 ... gọi là các liên kết (links)  các liên kết hữu tuyến  các liên kết vô tuyến  các mạng cục bộ ˆ đơn vị dữ liệu giao thức ở tầng 2 là frame , đóng gói/bao bọc gam dữ liệu “link” Tầng liên kết ... kết truy cập điểm-điểm qua quay số  liên kết điểm giữa Ethernet switch và host ˆ quảng bá (dây dẫn hay phương tiện truyền được chia sẻ)  Ethernet truyền thống  upstream HFC  802.11 wireless...

Ngày tải lên: 23/10/2014, 21:01

... 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 ... of 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 ... Trang 1Data Communication and Networ 1 Trang 2Cont ent Chapter 3: Data Link 2 Trang 3 Framing  The data link layer needs to pack bits into frames, that...

Ngày tải lên: 04/12/2016, 08:57

... AttackdefmonitorPackets (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) ... little creativity can be used to automate detecting layer two attacks • For more information, see “Detecting and Responding to Data Link Layer Attacks” published in SANS GCIA Reading Room ... Deauth AttackdefmonitorPackets(p): global deauthCNT if p.haslayer(Dot11): type = p.getlayer(Dot11).type subtype = p.getlayer(Dot11).subtype if ((type==0) and (subtype==12)): deauthCNT...

Ngày tải lên: 12/09/2017, 01:26

... Trang 1The Data Link LayerChapter 3 Trang 2Data Link Layer Design Issues• Services Provided to the Network Layer • Framing • Error Control • Flow Control Trang 3Functions of the Data Link Layer• ... Data Link Protocols• HDLC – High-Level Data Link Control • The Data Link Layer in the Internet Trang 41High-Level Data Link ControlFrame format for bit-oriented protocols Trang 42High-Level Data ... to the network layer • Dealing with transmission errors • Regulating(điều chỉnh) data flow • Slow receivers not swamped(ngập) by fast senders Trang 4Functions of the Data Link Layer (2)Relationship...

Ngày tải lên: 21/12/2017, 11:48

... (2)SinhVienZone.Com Trang 40Example Data Link Protocols• HDLC – High-Level Data Link Control • The Data Link Layer in the Internet SinhVienZone.Com Trang 41High-Level Data Link ControlFrame format for ... 3Functions of the Data Link Layer• Provide service interface to the network layer • Dealing with transmission errors • Regulating data flow SinhVienZone.Com Trang 4Functions of the Data Link Layer (2)Relationship ... Trang 1The Data Link LayerChapter 3 SinhVienZone.Com Trang 2Data Link Layer Design Issues• Services Provided to the Network Layer • Framing • Error Control • Flow...

Ngày tải lên: 30/01/2020, 23:02

... Trang 1The Data Link LayerChapter 3 Trang 2Data Link Layer Design Issues• Services Provided to the Network Layer • Framing • Error Control • Flow Control Trang 3Functions of the Data Link Layer• ... 39Petri Net Models (2)Trang 40Example Data Link Protocols• HDLC – High-Level Data Link Control • The Data Link Layer in the Internet Trang 41High-Level Data Link ControlFrame format for bit-oriented ... network layer • Dealing with transmission errors • Regulating data flow Trang 4Functions of the Data Link Layer (2)Relationship between packets and frames. Trang 5Services Provided to Network Layer(a)...

Ngày tải lên: 14/12/2021, 07:14

... truyền thông: links  Kết nối có dây (wired links)  Kết nối không dây (wireless links)  LANs  Gói dữ liệu ở lớp 2: frame, đóng gói datagram Tầng data-link có nhiệm vụ truyền datagram từ 1 ... network interface card NIC)  Ethernet card, 802.11 card; Ethernet chipset cpu memory host bus (e.g., PCI) network adapter card application transport network link link physical Trang 9Các Adaptor ... Trang 1Chapter 5Tầng Liên kết dữ liệu (Data Link layer) Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley...

Ngày tải lên: 25/02/2023, 15:51

... HCMUT Connection Management Trang 44Data Link Control Protocols The data link control layer is concerned with the transfer of data over a serial data link.  The link can be:  point-to-point physical ... synchronous  Service offered by data link: Trang 45Telecomm Dept. Faculty of EEE DCN HCMUT Data Link Protocol Application DTE DTE DTE: Data Terminal Equipment Trang 46Data Link Protocol ApplicationTrang ...  High-level Data Link Control: single link procedure  Link access procedure version B (LAPB): extension of LAPA, used in X.25 networks  Multilink procedure: extension of LAPB  Link access...

Ngày tải lên: 12/04/2023, 21:00

... Network Acces Layer (Lớp truy nhập mạng) tơng ứng với physicallayer & Data link layer trong OSI + Internetwork layer: định tuyến gói dữ liệu giữa các máy chủ + Host to host layer: kết nối ... (International Telecommunication Union - Hiệp hội viễnthông quốc tế) Physical layer: X21, X21 bis Data link layer: LAP-B Network layer: X25 - TCP/IP (Transmission Control Protocol/Internet protocol): ... mạng chuyển mạch gói(Packet Switched Network) Physical layer: X25.1 tớng ứng X21 bit Data link layer: X25.2 tơng ứng với LAP-B Network layer: X25.3 đặc tả giao diện DTE/DCE * Các chuẩn X3, X28...

Ngày tải lên: 19/06/2023, 11:23

... over a link 5: DataLink Layer 5-4 Link layer: context Ì Datagram transferred by different link protocols over different links: r e.g., Ethernet on first link, frame relay on intermediate links, ... network Ethernet LANs Ethernet LANs 5: DataLink Layer 5-102 IP-Over-ATM app transport IP Eth phy IP AAL Eth ATM phy phy ATM phy ATM phy app transport IP AAL ATM phy 5: DataLink Layer 5-103 Datagram ... communication path are links r r r wired links wireless links LANs Ì layer-2 packet is a frame, encapsulates datagram data-link layer has responsibility of transferring datagram from one node...

Ngày tải lên: 12/09/2012, 15:06

... Trang 1Data Access Layer Silverlight and some WPF applications do not use offline storage for persisting data Instead, they use a relational database to store the object data in a structured ... instructing the data store to return the requested data, insert new records, and update or remove existing records The DataReader class will be examined to retrieve the correct data into newly ... correspond to inserting new records in the database, retrieving records from the database, editing existing records, and removing records entirely from the database, respectively Clients can combine...

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. After ... 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 ... transactional DAL. Module 9: The Transactional Data Access Layer 3 The Business Problem DAL Connected Business Logic Layer Disconnected Business Logic Layer Facade Layer Web Services Facade Business Facade...

Ngày tải lên: 05/11/2013, 12:15

... nontransactional DAL Trang 12Microsoft Data Access Components Other Data Sources Other Data Sources Databases Relational Databases Relational Data Object Interfaces Data Object Interfaces Application ... Layer Disconnected Business Logic Layer Facade Layer 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 ... nontransactional data access layer (DAL) Module 8 is the first of two modules that focus on the DAL: Module 8, “The Nontransactional Data Access Layer” and Module 9, “The Transactional Data Access Layer.”...

Ngày tải lên: 21/12/2013, 06:17

... Level Data Link Control HDLC ISO 33009, ISO 4335 Trang 28HDLC Station Types Primary station Controls operation of link Frames issued are called commands Maintains separate logical link to ... and one for user (next layer up) Trang 47Other DLC Protocols (LLC) Logical Link Control (LLC) IEEE 802 Different frame format Link control split between medium access layer (MAC) and LLC (on ... Protocols (LAPB,LAPD) Link Access Procedure, 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,...

Ngày tải lên: 16/02/2014, 08:20

... DATA LINK CONTROL PROTOCOLS 2 Introduction  Data link control layer – often abbreviated simply to data link layer – is concerned with the transfer of data over a serial data link  The ... protocol  The data link layer is fundamental to the operation of all data communication applications 3 Introduction  Depending on the application, the user service provided by the data link layer ... between the two data link layer protocol entities is established (using L_Connect service)  All data is transfer using a suitable retransmission and flow control protocol  When all data has been...

Ngày tải lên: 30/03/2014, 07:20

... brun Mediterranean type and consists of sand and clay with pH(H O) 7.7 in the surface layer and 8.0 in deeper layers The texture varies between clay and loam Leaf water status Leaf (xylem) water ... seven dif ferent times during the growing period, which started in May and ended in November 1993 Data analysis Analysis of variance and the Duncan test were used Average standard error was calculated ... well recognized (Sobrado, 1986) and all the studied oaks belong to these species as Phenological data According to table III, new leaves appeared approximately on 11 April The leaves com- pleted...

Ngày tải lên: 08/08/2014, 18:21