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To understand networks, you must understand how NICs work The network must provide a mechanism that gives each system a unique identifier like a telephone number so that data is delivered to the right system That s one of the most important jobs of a NIC Inside every NIC, burned onto some type of ROM chip, is special firmware containing a unique identifier with a 48-bit value called the media access control address, or MAC address No two NICs ever share the same MAC address ever Any company that makes NICs must contact the Institute of Electrical and Electronics Engineers (IEEE) and request a block of MAC addresses, which the company then burns into the ROMs on its NICs Many NIC makers also print the MAC address on the surface of each NIC, as shown in Figure 2-11 Note that the NIC shown here displays the MAC address in hexadecimal notation Count the number of hex characters because each hex character represents 4 bits, it takes 12 hex characters to represent 48 bits

3000 2500 2000 1500 1000 500 4 2 2 4 x

01 1

7 A frame ends with a special bit called the cyclic redundancy check (CRC) What does the CRC do A Cycles data across the network B Verifies that the MAC addresses are correct C Verifies that the data arrived correctly D Verifies that the IP address is correct 8 Which of the following is an example of a MAC address A 0 255 B 00 50 56 A3 04 0C C SBY3M7 D 192168413 9 Which layer of the OSI seven-layer model controls the assembly and disassembly of data A Application layer B Presentation layer C Session layer D Transport layer 10 Which layer of the OSI seven-layer model keeps track of a system s connections to send the right response to the right computer A Application layer B Presentation layer C Session layer D Transport layer

0909 0500

Figure 412 A plot of cosh 2 x + sinh 2 x , with exponential growth for positive and negative values of x

1 C Data comes into a hub through one wire, and is then sent out through all the other wires A hub sends data to all the systems connected to it 2 B The unique identifier on a network interface card is called the media access control (MAC) address 3 A All versions of Windows use IPCONFIG /ALL from the command line to determine the MAC address 4 C The MAC address is a physical address 5 C Data is sent in discrete chunks called frames Networks use frames to keep any one NIC from hogging the wire 6 A The frame begins with the MAC address of the receiving NIC, followed by the MAC address of the sending NIC, followed in turn by the data and CRC

Since the maximum length for many media is about 100 meters, it is impossible for some LAN protocols (including Ethernet) to even approach the length required to get a large value for a Keep in mind that this calculation is theoretical and should be used to understand how networks work In the real world, network performance can be influenced by a variety of factors

7 C The data is followed by a special bit of checking information called the cyclic redundancy check, which the receiving NIC uses to verify that the data arrived correctly 8 B A MAC address is a 48-bit value, and no two NICs ever share the same MAC address ever 00 50 56 A3 04 0C is a MAC address Answer D (192168413) is an IP address 9 D The Transport layer controls the assembly and disassembly of data 10 C The Session layer keeps track of a system s connections, to ensure that it sends the right response to the right computer

So the exponential growth of the real part of the function is governed by cosh x, which blows up much slower than cosh 2 x + sinh 2 x A plot of cosh x is shown over the same interval in Fig 415 for comparison with Fig 412 Be sure to compare the vertical axis of the two plots