Detecting Physical Layer Attacks on Ethernet Networks
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Ethernet Switches and Crossover Cables
Ethernet Switch A switch is something that is used to turn various electronic devices on or off. However, in computernetworking, a switch is used to connect multiple computers with each other. Since it is an external device it becomes part of the hardware peripherals used in the operation of a computer system. This connection is done within an existing Local Area network (LAN) only and is identical to an Ethernet hub in terms of appearance, but with more intelligence. These switches not only receive data packets, but also have the ability to inspect them before passing them on to the next computer. That is, they can figure out the source, the contents of the data, and identify the destination as well. As a result of this uniqueness, it sends the data to the relevant connected system only, thereby using less bandwidth at high performance rates. The first Ethernet network switch was pioneered by Kalpana (computer networking equipmentmanufacturing company in Silicon Valley established by an entrepreneur of Indian origin, Vinod Bharadwaj) in 1990. Switches operate at Layer 2 of the OSI Model; the Data-Link Layer. This is in contrast to routers, which operate at Layer 3 of the OSI Model, the Network Layer. A switch stores the MAC Address of each and every device which is connected to it. The switch will then evaluate every frame that passes through it. The switch will examine the destination MAC Address in each frame. Based upon the destination MAC Address, the switch will then decide which port to copy the frame to. If the switch does not recognize the MAC Address, it will not know which port to copy the frame to. -
Gigabit Ethernet - CH 3 - Ethernet, Fast Ethernet, and Gigabit Ethern
Switched, Fast, and Gigabit Ethernet - CH 3 - Ethernet, Fast Ethernet, and Gigabit Ethern.. Page 1 of 36 [Figures are not included in this sample chapter] Switched, Fast, and Gigabit Ethernet - 3 - Ethernet, Fast Ethernet, and Gigabit Ethernet Standards This chapter discusses the theory and standards of the three versions of Ethernet around today: regular 10Mbps Ethernet, 100Mbps Fast Ethernet, and 1000Mbps Gigabit Ethernet. The goal of this chapter is to educate you as a LAN manager or IT professional about essential differences between shared 10Mbps Ethernet and these newer technologies. This chapter focuses on aspects of Fast Ethernet and Gigabit Ethernet that are relevant to you and doesn’t get into too much technical detail. Read this chapter and the following two (Chapter 4, "Layer 2 Ethernet Switching," and Chapter 5, "VLANs and Layer 3 Switching") together. This chapter focuses on the different Ethernet MAC and PHY standards, as well as repeaters, also known as hubs. Chapter 4 examines Ethernet bridging, also known as Layer 2 switching. Chapter 5 discusses VLANs, some basics of routing, and Layer 3 switching. These three chapters serve as a precursor to the second half of this book, namely the hands-on implementation in Chapters 8 through 12. After you understand the key differences between yesterday’s shared Ethernet and today’s Switched, Fast, and Gigabit Ethernet, evaluating products and building a network with these products should be relatively straightforward. The chapter is split into seven sections: l "Ethernet and the OSI Reference Model" discusses the OSI Reference Model and how Ethernet relates to the physical (PHY) and Media Access Control (MAC) layers of the OSI model. -
Spec TEG-S40TXD(English).Pdf
TRENDnet TRENDware, USA TEG-S40TXD What's Next in Networking 4-Port 10/100/1000Mbps Copper Gigabit Ethernet Switch TRENDnet’s TEG-S40TXD Copper Gigabit Switch consist of four 10/100/1000Mbps Copper Gigabit Ethernet ports with each port having Auto-negotiation and Auto-MDIX features. The Switch offers a reliable and affordable LAN solution to meet immediate bandwidth demand. Users can connect Server(s) to the Gigabit port(s) to increase network performance or cascade Copper Gigabit Switches together to create high-bandwidth Gigabit backbones. TRENDnet’s TEG- S40TXD provides simple migration, scalability, and flexibility to handle new applications and data types making it a highly reliable and cost effective solution for high-speed network connectivity. Features Benefits 4 x 10/100/1000Mbps Copper Gigabit Ethernet Integration Friendly: Ports Plug-n-Play. Connects with current Fast Ethernet Cat. 5 cables. Full/Half duplex transfer mode for each port (1000Mbps in full-duplex only) Flexible: All ports automatically negotiate Auto-MDIX on each port 10/100/1000Mbps network speed. All ports are Auto-MDIX; connection can Supports store-and-forward switching architecture be made with either a straight through with non-blocking full wire-speed performance or a crossover cable. Supports aging function and 802.3x flow control for Expandability: full-duplex mode and back pressure flow control for Cascade Gigabit Switches together to half-duplex mode operation create a Gigabit backbone. Up to 8K unicast addresses entities per device Performance: Gigabit -
Ethernet and Wifi
Ethernet and WiFi hp://xkcd.com/466/ CSCI 466: Networks • Keith Vertanen • Fall 2011 Overview • Mul?ple access networks – Ethernet • Long history • Dominant wired technology – 802.11 • Dominant wireless technology 2 Classic Ethernet • Ethernet – luminferous ether through which electromagne?c radiaon once thought to propagate – Carrier Sense, Mul?ple Access with Collision Detec?on (CSMA/CD) – IEEE 802.3 Robert Metcalfe, co- inventor of Ethernet 3 Classic Ethernet • Ethernet – Xerox Ethernet standardized as IEEE 802.3 in 1983 – Xerox not interested in commercializing – Metcalfe leaves and forms 3Com 4 Ethernet connec?vity • Shared medium – All hosts hear all traffic on cable – Hosts tapped the cable – 2500m maximum length – May include repeaters amplifying signal – 10 Mbps bandwidth 5 Classic Ethernet cabling Cable aSer being "vampire" tapped. Thick Ethernet cable (yellow), 10BASE-5 transceivers, cable tapping tool (orange), 500m maximum length. Thin Ethernet cable (10BASE2) with BNC T- connector, 185m maximum length. 6 Ethernet addressing • Media Access Control address (MAC) – 48-bit globally unique address • 281,474,976,710,656 possible addresses • Should last ?ll 2100 • e.g. 01:23:45:67:89:ab – Address of all 1's is broadcast • FF:FF:FF:FF:FF:FF 7 Ethernet frame format • Frame format – Manchester encoded – Preamble products 10-Mhz square wave • Allows clock synch between sender & receiver – Pad to at least 64-bytes (collision detec?on) Ethernet 802.3 AlternaWng 0's 48-bit MAC and 1's (except addresses SoF of 11) 8 Ethernet receivers • Hosts listens to medium – Deliver to host: • Any frame with host's MAC address • All broadcast frames (all 1's) • Mul?cast frames (if subscribed to) • Or all frames if in promiscuous mode 9 MAC sublayer • Media Access Control (MAC) sublayer – Who goes next on a shared medium – Ethernet hosts can sense if medium in use – Algorithm for sending data: 1. -
Power Over Ethernet
How To | Power over Ethernet Introduction Power over Ethernet (PoE) is a technology allowing devices such as IP telephones to receive power over existing LAN cabling. This technical note is in four parts as follows: • PoE Technology • How PoE works • Allied Telesyn PoE implementation • Command Reference What information will you find in this document? The first two parts of this document describe the PoE technology, and the installation and management advantages that PoE can provide. This is followed by an overview of how PoE works, Power Device(PD) discovery, PD classification, and the delivery of power to PD data cables. The third part of this document focuses on Allied Telesyn’s implementation of PoE on the AT-8624PoE switch. The document concludes with a list of configuration and monitoring commands. Which product and software version does this information apply to? The information provided here applies to: • Products: AT8624PoE switch • Software version: 2.6.5 C613-16048-00 REV C www.alliedtelesyn.com PoE Technology Power over Ethernet is a mechanism for supplying power to network devices over the same cabling used to carry network traffic. PoE allows devices that require power, called Powered Devices (PDs), such as IP telephones, wireless LAN Access Points, and network cameras to receive power in addition to data, over existing infrastructure without needing to upgrade it. This feature can simplify network installation and maintenance by using the switch as a central power source for other network devices. A device that can source power such as an Ethernet switch is termed Power Sourcing Equipment (PSE). Power Sourcing Equipment can provide power, along with data, over existing LAN cabling to Powered Devices. -
IEEE 802.3At Power Over Gigabit Ethernet Extender
POE-E201 IEEE 802.3at Power over Gigabit Ethernet Extender • IEEE 802.3at / 802.3af Power over Ethernet compliant • Complies with IEEE 802.3 / 802.3u / 802.3ab 10/100/1000Base-T • Extends the range of PoE to more than 100 meters (328ft.). • Automatically detects and protects PoE equipment from Long Distance High Power PoE and Gigabit Data Extension Solution being damaged by incorrect installation PLANET POE-E201 is a newly designed simple device which extends both the reach of Gigabit Ethernet Data and IEEE 802.3at / 802.3af Power over Ethernet over the • Multiple units, daisy-chain installation support standard 100m (328 ft.) CAT. 5/5e/6 UTP cable to 200m, 300m, 400m and maximum • Forwards both Ethernet data and PoE power to the 500m. remote device Currently, PoE supported networking devices such as PoE IP cameras, PoE wireless • No external power cable installation required access points and PoE IP Phones have become the mainstream of network deployment • Compact size, wall-mountable design because of the convenience of easy installation regardless of additional power supply. However, limited by the UTP cable specifications, only up to 100 meters (328 ft.) • Plug and Play of cable could be applied for IP-based and PoE powered devices (PD) installation. Therefore, the POE-E201 is designed as the repeater to forward both Gigabit Ethernet data and high power PoE power, and thus extend the range of PoE installation. By just plug and play without additional power supply and setup, one single POE-E201 can increase the PoE range to 200m. By daisy-chaining multiple POE-E201s, it offers you great flexibility to extend the distance of PoE network to triple, quadruple further in length or more. -
Towards 100 Gbps Ethernet: Development of Ethernet / Physical Layer Aspects
SEMINAR ON TOPICS IN COMMUNICATIONS ENGINEERING 1 Towards 100 Gbps Ethernet: Development of Ethernet / Physical Layer Aspects Ömer Bulakci Abstract — Physical layer features of Ethernet from the first released clauses and ongoing architecture researches for 100 realization towards the 100 Gb Ethernet (100 GbE) development GbE are elaborated. have been considered. Comparisons of these features are made according to the standardized data rates. Feasible physical layer TABLE I options are then discussed for high data rates. Milestones of 802.3 IEEE Standard I. INTRODUCTION Clause Date of Bit Physical THERNET is the most widely deployed Local Area Name Release Rate Medium Network (LAN) protocol and has been extended to E 802.3a Single Metropolitan Area Networks (MAN) and Wide Area (Thin Ethernet) 1985 10 Mbps Thin Coaxial Networks (WAN) [1]. The major advantages that characterize (Cheapernet) Cable Ethernet can be stated as its cost efficiency, traditional tenfold bit rate increase (from 10 Mbps to 100 Gbps), simplicity, high 802.3i 1990 10 Mbps TP Copper transmission reliability and worldwide interoperability 802.3j 1993 10 Mbps Two MMFs between vendors [2]. TP Copper The first experimental Ethernet was developed during the 802.3u 1995 100 Mbps Two Fibers early 1970s by XEROX Corporation in a coaxial cable (Fast Ethernet) (MMF,SMF) network with a data rate about 3 Mbps [3]. The initial 802.3z 1998 1 Gbps MMF, SMF standardization process of Ethernet was started in 1979 by (Gigabit Ethernet) Digital Equipment Corporation (DEC), Intel and Xerox. In 802.3ab 1999 1 Gbps TP Copper 1980, DIX Standard known as the “Thick Ethernet” was 802.3ae 2002 10 Gbps MMF,SMF released. -
Gigabit Ethernet Gigabit Ethernet
Gigabit Ethernet Gigabit Ethernet Vijay Moorthy, ([email protected]) Ethernet is the world's most pervasive networking technology. Gigabit Ethernet is the latest version of Ethernet. It offers 1000 Mbps ( 1 Gbps ) raw bandwidth, that is 100 times faster than the original Ethernet, yet is compatible with existing Ethernets, as it uses the same CSMA/CD and MAC protocols. When Gigabit Ethernet enters the market it will compete directly with ATM. This paper presents a survey of Gigabit Ethernet technology. Other Reports on Recent Advances in Networking Back to Raj Jain's Home Page Table of Contents 1. Introduction 1.1 History of Ethernet 1.2 Gigabit Ethernet Alliance 2. Physical Layer 2.1 1000Base-X 2.2 1000Base-T 3. MAC Layer 3.1 Carrier Extension 3.2 Packet Bursting 4. GMII ( Gigabit Media Independent Interface ) 4.1 PCS (Physical Coding Sublayer) 4.2 PMA (Physical Medium Attachment) 4.3 PMD (Physical Medium Dependent) 5. Buffered Distributor 6. Topologies 6.1 Upgrading server-switch connections 6.2 Upgrading switch-switch connections 6.3 Upgrading a Fast Ethernet backbone 6.4 Upgrading a Shared FDDI Backbone 6.5 Upgrading High Performance Workstations 7. ATM vs. Gigabit Ethernet 8. Summary 9. Bibliography and Links http://www.cis.ohio-state.edu/~jain/cis788-97/gigabit_ethernet/index.htm (1 of 12) [2/7/2000 12:24:48 PM] Gigabit Ethernet 1. Introduction Ethernet is the world's most pervasive networking technology , since the 1970's. It is estimated that in 1996, 82% of all networking equipment shipped was Ethernet. In 1995 ,the Fast Ethernet Standard was approved by the IEEE. -
10/100 Physical Layer Ethernet Switch,16-Port
10/100 PHYSICAL LAYER ETHERNET SWITCH,16-PORT Make 10/100 Physical Layer Ethernet connections without rewiring or rerouting cables. Key Features emotely configure, redistribute, Ethernet hub or network switch You can also instantly and Ideal for point-to-point R and monitor Ethernet devices using a crossover cable. Each effortlessly recall up to 16 Ethernet connections. in 10/100 Ethernet LAN connected device can be placed frequently-used patching environments. The 10/100 up to 328 ft. (100 m) away from the configurations (stored in the Auto-adapts port Physical Layer Ethernet Switch, switch. switch’s non-volatile memory) via speed to either 10 or 16-Port provides point-to-point The switch installs between the LAN or RS-232 serial port. 100 Mbps. connectivity without rewiring or your patch panels and network The control software works rerouting cables. And it switch. Since it operates at the with Windows® 95/98/2000/XP and Switch between up to automatically adapts to port Physical Layer, the switch can Windows NT®. The PC connected 16 devices, each speeds of 10 or 100 Mbps. shut down the physical connec- to the serial port can be located located up to 328 ft. Attach 10BASE-T Ethernet or tion to specific workstations, up to 50 ft. (15.2 m) from the (100 m) away from the 100BASE-TX Fast Ethernet departments, or buildings. You switch, while the workstation switch. devices via the 16 RJ-45 can do this remotely via the connected to the LAN port can be connectors on the switch’s front control software and a PC located up to 328 ft. -
Ethernet Technology 1 Ethernet Technology 2
• History - Xerox : LAN for open office automation (1970s) 3Mbps on 75 Ohm Coax, coverage 1km area - DEC, Intel, and Xerox Co-proposed “Ethernet v1.0” (9/1980) - D.I.X. Ö Ethernet ver 2.0 (11/1982): 50Ohm Coax, 2.8 km • ANSI/IEEE 802.3 (ISO 8802.3) - Reformulated Ethernet v2 in 1985 - Drop cable, connector technology, times and fields are redefined - It’s used with Ethernet interchangeably, but less meaningful than Ethernet (?retain the original name) - Supplementary documents (regarding to various medium) + Upgrades are published after Feb.1989 Î IEEE 802.3x Ethernet Technology 1 Ethernet Technology 2 NotationNotation ofof EthernetEthernet TechnologyTechnology # B X / # Bit rate in Mbps: Distance in 100m: -1 -10 -100 - 2, -5, -36, -1000 -10000 or Medium: Simplified to: Signaling method: - Baseband 10/100Æ T?/TX or F/FX invented by: Bob Metcalfe and David Boggs in 1970 1GE & 10GE - Broadband 1GEÆ (C/S/L)X or T 10GEÆ(S/L/E)(X/R/W) ൩೭ኬǻ Ethernet Technology 3 Ethernet Technology More on Ethernet Family 4 Bus Topology -- 10Base2/5/36 Explanation of the Abbreviations • Connecting nodes via (tap to) coaxial cable • Transmission and receiving over the same media (line) • Basic configuration (Ex: A 10Base5 segment = a coax) : TRL ~ Transceiver’s cable Length DBN ~ Distance Between Nodes ӕືႝᢑࢤȐനߏ 500 ϦЁȑ MSL node NPS ~ Nodes Per Segment DBT Terminator Multiple of 2.5m Coaxial Cable tap Extension ? MES MSL ~ Maximum Segment Length ԏวᏔ Ȑനߏ 50 ϦЁȑ TRL ԏวᏔႝᢑ Transceiver Terminator ಖᆄᏔ MES ~ Maximum Extendable Segments ࢤനӭௗ 100 ঁȑ NPSȐ • Important parameters: TRL, DBT, NPS, MSL, and MND. -
Modern Ethernet
Color profile: Generic CMYK printer profile Composite Default screen All-In-One / Network+ Certification All-in-One Exam Guide / Meyers / 225345-2 / Chapter 6 CHAPTER Modern Ethernet 6 The Network+ Certification exam expects you to know how to • 1.2 Specify the main features of 802.2 (Logical Link Control) [and] 802.3 (Ethernet): speed, access method, topology, media • 1.3 Specify the characteristics (for example: speed, length, topology, and cable type) of the following cable standards: 10BaseT and 10BaseFL; 100BaseTX and 100BaseFX; 1000BaseTX, 1000BaseCX, 1000BaseSX, and 1000BaseLX; 10GBaseSR, 10GBaseLR, and 10GBaseER • 1.4 Recognize the following media connectors and describe their uses: RJ-11, RJ-45, F-type, ST,SC, IEEE 1394, LC, MTRJ • 1.6 Identify the purposes, features, and functions of the following network components: hubs, switches • 2.3 Identify the OSI layers at which the following network components operate: hubs, switches To achieve these goals, you must be able to • Define the characteristics, cabling, and connectors used in 10BaseT and 10BaseFL • Explain how to connect multiple Ethernet segments • Define the characteristics, cabling, and connectors used with 100Base and Gigabit Ethernet Historical/Conceptual The first generation of Ethernet network technologies enjoyed substantial adoption in the networking world, but their bus topology continued to be their Achilles’ heel—a sin- gle break anywhere on the bus completely shut down an entire network. In the mid- 1980s, IBM unveiled a competing network technology called Token Ring. You’ll get the complete discussion of Token Ring in the next chapter, but it’s enough for now to say that Token Ring used a physical star topology. -
Total Networking Solutions for IT/OT Convergence
Total Networking Solutions for IT/OT Convergence Total networking solutions that can improve security, productivity and operational efficiency today, while laying the foundations for tomorrow‘s intelligent manufacturing opportunities. Edition 2020 Belden Total Networking Solutions Belden combines the strength of Hirschmann & Hirschmann IT switches, Tripwire traffic trend tracking and risk management systems and Belden Ethernet cables for comprehensive networking solutions for IT/OT convergence. You can depend on us to keep your mission-critical systems running steady and securely. Easy to implement, intelligent and secured IT/OT converged solutions for networks ranging from small to large size. Belden IT/OT converged solutions Belden has over 30 year’s experiences on • We offer the broadest selection of products, We will consult with you to develop a strategy or offering integrated network solutions for for a complete, end-to-end network we will develop and implement your full design complex industrial facilities and systems. solution. – either way our staff is available to you. As the size of industrial facility network • Our sales and engineering professionals can and demand for higher efficiency increase, audit, recommend/design, configure and Training the IT network is required to converge with assemble the products and systems to your Backed by years of meeting and exceeding industrial network. At the same time, lots specific requirements. the needs of a broad range of end-user of IT technologies, including big-data, AI, • Our global manufacturing, distribution and applications, Belden is ideally suited to offer visual identity and robotics, keep pushing the support network makes our products and beginners and networking experts alike the industrial network evolution forward.