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The Ethernet standard dictates that no two devices in the entire world will have the same MAC address; this is established through the issuance of ranges of MAC addresses that are allocated to each manufacturer of Ethernet devices Typically, each manufacturer will be issued a range, which consists of the first three bytes of the MAC address; the manufacturer will then assign consecutive values for the last three bytes to each device that it produces For example, a company is issued the value A0-66-01 (called its Organizationally Unique Identifier, or OUI) The devices that the company produces will have that value as the first three bytes of its MAC address and assign three additional bytes to each device that it produces, giving addresses such as A0-66-01-FF-01-01, A0-66-01-FF-01-02, A0-66-01-FF-01-03, and so on This will guarantee that no two devices in the world will have the same address Ethernet Frame Format An Ethernet frame consists of a header segment, a data segment, and a checksum The header segment contains the destination MAC address, the source MAC address, and a two-byte Ethernet type field The data segment ranges from 46 to 1,500 bytes in length The checksum field is four bytes in length and is a CRC (cyclical redundancy check) checksum of the entire frame An Ethernet frame is shown in Figure 5-18 Ethernet Devices Network devices are required to facilitate the transmission of frames on an Ethernet network These devices include: Network adaptor A network adaptor, commonly known as a Network Interface Card (NIC), is a device that is directly connected to a computer s bus and contains one or more connectors to which an Ethernet network cable may be connected Often, a computer s NIC is integrated with the computer s motherboard, but a NIC may also be a separate circuit card that is plugged into a bus connector Repeater A repeater is a device that receives and retransmits the signal on an Ethernet network Repeaters are useful for situations in which cable lengths exceed 100 m, or to interconnect two or more Ethernet networks A disadvantage of repeaters is that they propagate collisions and other network anomalies onto all parts of the network Repeaters are seldom used today
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Figure 5-18
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An Ethernet frame consists of a header, data, and checksum
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5: IT Service Delivery and Infrastructure
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Bridge A bridge is a device that is used to interconnect Ethernet networks For example, an organization may have an Ethernet network on each floor of a multistory building; an Ethernet bridge can be used to interconnect each of the separate Ethernet networks A bridge is similar to a repeater, except that a bridge does not propagate errors such as collisions, but instead only propagates well-formed packets Hub Organizations came to realize that ring and bus topology networks were problematic with regard to cable failures This gave rise to the star topology as a preferred network architecture, because a cable problem would affect only one station instead of many or all A multiport repeater would be used to connect all of the devices to the network Over time, this device became known as a hub Like repeaters, Ethernet hubs propagate packets to all stations on the network Switch An Ethernet switch is similar to a hub, but with one important difference: A switch will listen to traffic and learn the MAC address(es) associated with each port (connector) and will send packets only to destination ports The result is potentially greater network throughput, because each station on the network will be receiving only the frames that are specifically addressed to it When only one station is connected to each port on an Ethernet switch, theoretically, collisions will never occur
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ATM, or Asynchronous Transfer Mode, is a link-layer network protocol developed in the 1980s in response to the need for high-speed networks that delivered better performance than 10Mbit Ethernet networks ATM is a dominant protocol in the core networks of telecommunications carriers The speeds of ATM networks are tied to the speed of the SONET transport layer, which begins at 155Mbit/sec Unlike Ethernet, ATM is a synchronous network, which means that messages (called cells) on an ATM network are transmitted in synchronization with a network-based time clock Stations on an Ethernet, on the other hand, transmit whenever they feel like it (provided the network is quiet at the moment) ATM cells are fixed at a length of 53 bytes (5-byte header and 48-byte payload) This small frame size improves performance by reducing jitter, which is a key characteristic of networks that are carrying streaming media ATM is a connection-oriented link-layer protocol This means that two devices on an ATM network that wish to communicate with each other will establish a connection through a virtual circuit A connection also establishes a Quality of Service (QoS) setting for the connection that defines the priority and sensitivity of the connection Cells that are transmitted from one station to another are transported through one or more ATM switches The path that a cell takes is established at the time that the virtual circuit is established An ATM switch is used even when two stations on the same local area network are communicating with each other Like Ethernet, ATM can be used to transport TCP/IP messages TCP/IP packets that are larger than 48 bytes in length are transmitted over ATM in pieces and reassembled at the destination
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