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A MAC address is 48 bits long and is represented as a hexadecimal number Represented in hex, it is 12 characters in length, where each character is 4 bits To make it easier to read, the MAC address is represented in a dotted hexadecimal format, like this: FFFF FFFFFFFF Some formats use a colon (:) instead; and in some cases, the colon separator is spaced after every two hexadecimal digits, like this: FF:FF:FF:FF:FF:FF As mention in 2, the first six digits of a MAC address are associated with the vendor, or maker, of the NIC Each vendor has one or more unique sets of six digits These first six digits are commonly called the organizationally unique identifier (OUI) The last six digits are used to represent the NIC uniquely within the OUI value In theory, each NIC has a unique MAC address In reality, however, this is probably not true You can have the same What is important for your purposes is that MAC address in different broadcast each of your NICs has a unique MAC address domains (virtual LANs)This is discussed within the same physical or logical segment A further in s 10 and 13 logical segment is a virtual LAN (VLAN) and is referred to as a broadcast domain (discussed in 13) Some devices, such as Cisco routers, might allow you to change the MAC address for a NIC, while others won t Every data link layer frame has two MAC addresses: a source MAC address of the host creating the frame and a destination MAC address for the device (or devices, in the cast of a broadcast or multicast) intended to receive the frame If only one device is to receive the frame, a unicast destination MAC address is used If all devices need to receive the frame, a destination broadcast address is used When all the binary bits are enabled for a MAC address, this is referred to as a local broadcast address: FFFF FFFFFFFF Unicast, broadcast, and multicast addresses were discussed in 2
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3: Layer 2 LAN Technologies
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Local broadcasts, such as FFFFFFFFFFFF, are propagated throughout the same broadcast domain: this can be the Ethernet segment or multiple Ethernet segments if they are de ned in the same VLAN (see 13) One important
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item to point out is that a layer 3 device, such as a router, will not propagate a local broadcast from one layer 3 interface to another Actually, that s one advantage of using routers: they contain broadcasts
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A NIC, commonly called a LAN adapter, provides the physical connection from a computer or network component to a wired or wireless layer 2 LAN media A NIC has the following components: interrupt request line (IRQ), an input/output (I/O) address in memory, a driver (software that interfaces with the NIC), and a MAC address The MAC address is burned into read-only memory (ROM) on the NIC and is commonly called a burned-in address (BIA) However, the MAC address is copied into RAM and is then used by the driver software Some drivers allow the user to change the copied MAC address in RAM (the BIA can t be changed since it is burned into ROM)
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LANs typically use either copper or fiber-optic cabling Copper cabling can include one strand of copper across which an electrical voltage is transmitted, or many strands of copper Fiber-optic cabling uses light-emitting diodes (LEDs) and lasers to transmit data With this transmission, light is used to represent binary 1s and 0s: if light is on the wire, this represents a 1; if there is no light, this represents a 0
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