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37 Cards in this Set
- Front
- Back
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CSMA/CD
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Carrier Sense Multiple Access with Collision Detection
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Collision Step 1
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A jam signal informs all devices a collision has occurred.
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Collision Step 2
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Collision invokes a random backoff algorithim
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Collision Step 3
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Each device stops transmitting for a short time until its backoff timer expires.
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Collision Step 4
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All hosts have equal priority to transmit after the timers have expired.
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MAC Address is _____ bits and written in ___________ .
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48 bits - written in hexadecimal
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MAC Address - Bit 47 ____
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Individual / Group - 0 = Device 1 = Broadcast
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MAC Address - Bit 46 _____
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Global / Local or U/L Universal or Local - Global address is assigned by IEEE - 1=locally administered address
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Nible
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4 bits
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Byte
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8 bits
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Nibble values
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8, 4, 2, 1 = 15
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Byte Values
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128, 64, 32, 16, 8, 4, 2, 1 = 255
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Binary Value 10000000
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Decimal 128
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Binary Value 11000000
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Decimal 192
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Binary Value 11100000
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Decimal 224
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Binary Value 11110000
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Decimal 240
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Binary Value 11111000
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Decimal 248
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Binary Value 11111100
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Decimal 252
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Binary Value 11111110
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Decimal 254
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Binary Value 11111111
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Decimal 255
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Hex Value 0
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Decimal 0 - 0000
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Hex 1
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Decimal 1 - 0001
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Hex 2
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Decimal 2 - 0010
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Hex 3
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Decimal 3 - 0011
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Hex 4
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Decimal 4 - 0100
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Hex 5
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Decimal 5 - 0101
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Hex 6
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Decimal 6 - 0110
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Hex 7
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Decimal 7 - 0111
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Hex 8
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Decimal 8 - 1000
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Hex 9
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Decimal 9 - 1001
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Hex A
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Decimal 10 - 1010
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Hex B
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Decimal 11 - 1011
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Hex C
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Decimal 12 - 1100
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Hex D
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Decimal 13 - 1101
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Hex E
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Decimal 14 - 1110
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Hex F
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Decimal 15 - 1111
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Used at Data Link Layer to encapsulate packets from Network Layer
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Frames
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