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34 Cards in this Set
- Front
- Back
What are the 3 main reasons we use patch panels?
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1. Ease of upgrading
2. Reducing cable damage 3. Troubleshooting |
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What are the types of wiring an RJ 45?
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1. 568a
2. 568 b 3. Rollover |
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When creating an Ethernet cable, why do we split the green cable with the blue cable?
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It prevents cross talk.
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What is crosstalk?
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A signal traveling down one wire that will generate an electrical magnetic field that can disrupt or induce a false signal with another cable.
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What are the only wires used in an Ethernet cable for a 10/100 network?
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1,2,3,6
are the only cables used |
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What is attenuation?
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Weakening of the signal.
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What is the minimum length an Ethernet cable must reach before the attenuation starts degrading?
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100 meters
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What does a repeater do?
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It restores the signal to the signals original strength
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What is needed to ping?
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1. Source MAC address
2. IP address |
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What is the MAC broadcast address?
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FF:FF:FF:FF:FF:FF
otherwise known as the "all F" address. |
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What is anding
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- The mathematical process where if all locations = 1, the output will be 1; if any number is 0 the output will be 0
-- Any number anded with itself is going to be itself -- Any number with all 1s is going to give you the number you started with -- Any number anded with all 0's is going to be 0 |
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What happens with an ARP request if the destination is local?
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Address Resolution Protocol
The address is sent |
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What is ASIC?
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Application Specific Integrated Circuit
It is used in switches |
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What is the command to show the MAC address in a Cisco router?
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Show Mac-address-table
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What is IEEE 802.2?
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Ethernet Standard
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What is IEEE 802.3?
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Novel standard
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802.2 and 802.3 ___________________
are or are not compatible with each other |
802.2 and 802.3 are not compatible with each other
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What is the preamble?
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The signal sent to the node warning the node that a transmission is about to begin.
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What is SFD stand for?
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Start of Frame Delimiters
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What is an SFD?
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Start of Frame Delimiters
This identifies where the data begins during transmission |
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How many bits is an Ethernet frame header?
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14-bytes
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What does the Ethernet Frame Header Contain?
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- MAC destination address
- MAC source address - Other various fields |
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The encapsulation header for layer 3 includes?
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- IP destination address
- IP Source address |
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What is propagation delay?
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In general it is the length of time taken for the quantity of interest to reach its destination.
In other words - Data Gets lost |
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When do switches broadcast?
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When they do not have the MAC address in their MAC-address table.
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How many ports can bridges have?
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up to 16
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How many ports can switches have?
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hundreds
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Are bridges hardware or software based?
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Hardware
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Are switches hardware or software based?
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Software
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What does STP stand for?
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Spanning Tree Protocol
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What are the key points of STP?
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Spanning Tree Protocol
- Eliminates redundancy - Shuts off unneeded cables until they are needed |
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What does CIDR stand for?
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Classless Inter-Domain Routing (CIDR)
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What is CIDR?
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Classless Inter-Domain Routing (CIDR)
1. This is a way of subdividing a network 2. The number of bits turned on beyond the default mask, is going to determine the total number of subnets * Ex) class A subnet mask, with an ending subnet mask of 255.255.255.240 * CLASS A: 11111111.00000000.00000000.00000000 * NEW SM: 11111111.11111111.11111111.1111.0000 o This is 20 bits in addition to the starting mask n^20 determines how many host addresses there are |
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What is the host formula for usable addresses
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2^n -2
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