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53 Cards in this Set
- Front
- Back
The term networking model, or networking architecture, refers to an organized set of _________.
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Documents
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The term LAN refers to a set of Layer ____ standards for implementing geographically small networks.
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1 and 2
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Maximum cable length for 1000BASE-LX
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5km
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Maximum cable length for 1000BASE-SX
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550m
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Maximum cable length for 10BASE-T
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100m
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Maximum cable length for 100BASE-TX
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100m
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100BASE-TX refers to
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Fast Ethernet
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What is the corresponding IEEE specification for 100BASE-TX
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802.3u
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What does the T in 10BASE-T, 100BASE-TX, and 1000BASE-T mean
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twisted pair
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What is attenuation
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When an electrical signal gets weaker over a long length of cable
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Does a repeater amplify a signal?
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No, it reads 1's and 0's and generates a new signal to avoid repeating noise.
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IEEE 802.3 defines what
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MAC sublayer
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IEEE 802.2 defines what
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LLC sublayer
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10BASE-T is defined by which IEEE standard?
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802.3
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100BASE-TX is defined by which IEEE standard?
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802.3u
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1000BASE-LX and 1000BASE-SX are defined by which IEEE standard?
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802.3z
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1000BASE-T is defined by which IEEE standard?
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802.3ab
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Which is more focused on physical standards? 802.3 or 802.2
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802.3
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Maximum length of 10BASE5 cable?
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500m
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Maximum length of 10BASE2 cable?
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185m
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Hubs fixed the problem of _____ but not the problem of _____.
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Fixed the problem of one break in the cable causing the entire network to fail.
Did not fix the problem of collisions due to the devices all being on a single bus. |
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GBIC and SFP are both ?
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small removable devices that fit into a port or slot in a switch
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GBIC
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Gigabit Interface Converter
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SFP
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Small-Form Pluggable
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Networking device using UTP create an _________ using each wire pair, and the use of twisted pairs means that the ________s created by the wires cancel eachother out.
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electrical circuit
magnetic field |
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TIA
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Telecommunications Industry Association
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EIA
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Electronics Industry Alliance
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Color coding for pins on UTP cabling is
A. Arbitrarily decided by cable manufacturers B. Defined by TIA / EIA standards |
B
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In UTP cabling, the wire with a given solid color, and the wire with that color striped with white, are ______?
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Twisted / Paired
*i am fairly sure these terms mean the same thing, need to look into this though as i understand these wires, though paires, act as a single wire (1-bit wide), and data is only transmitted one way. data is transmitted on both wires though... because they're twisted... but it says the current is supposed to run opposite ways in each one... so that means one's positive and the other's negative? this "direction of current" would have nothing to do with the "direction of data transmission" maybe was confused because of that |
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UTP cabling with 2 pairs of wires is needed for what type/s of Ethernet?
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10BASE-T and 100BASE-TX
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UTP cabling with 4 pairs of wires is needed for what type/s of Ethernet?
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1000BASE-T
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Ethernet NIC's send on pins _____ and receive on pins ______
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1 and 2
3 and 6 |
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Ethernet hubs and switches send on pins _____ and receive on pins ______
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3 and 6
1 and 2 |
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Devices that transmit on 1,2 and receive on 3,6 include
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PC NIC's
Routers (!) Wireless Access Points Networked Printers |
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Cables connecting Ethernet switches to other switches are often called?
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Trunks
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T/F: Gigabit Ethernet transmits and receives on each wire pair simultaneously.
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True
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The feature of Cisco switches which corrects for the use of the wrong type of cable (crossover / straight-through) is called?
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auto-mdix
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Crossover cable used in Gigabit Ethernet (which cat?) differs from previous crossover cables how?
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It crosses over all pairs, so the standard crossover plus pins 4,5 are crossed with pins 7,8.
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A 100-Mbps switch has 100Mbps of bandwidth
a. per port b. combined for all ports |
a
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Describe the meaning of "shared Ethernet" vs "switched Ethernet"
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shared = bandwidth is shared because devices must take turns because of CSMA/CD
switched = each device has full bandwidth because of the use of Ethernet switches |
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T/F: CSMA/CD forces devices to operate at half-duplex
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True
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A switch with 24 100-Mbps devices connected to it allows for a theoretical maximum bandwidth of?
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2400Mbps
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A hub with 24 100-Mbps devices connected to it allows for a theoretical maximum bandwidth of?
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100Mbps
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Unicast Ethernet addresses identify?
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a single Ethernet interface
(book says, "a single LAN card") |
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Which portion of the Ethernet address identifies the manufacturer and what is it called and what is its size?
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first half
OUI (Organizationally Unique Identifier) 3 bytes (24 bits) |
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Broadcast Ethernet addresses identify?
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all devices on the LAN
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Multicast Ethernet addresses identify?
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some subset of devices on the LAN
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Burned-in address is?
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The 6-byte address assigned by the vendor making the card. (is there any other address than that assigned by the vendor? Does this differ from a MAC address. The book states, "regardless of whether the BIA is used or another address is configured, many people refer to unicast addresses as either LAN addresses, Ethernet addresses, hardware addresses, physical addresses, or MAC addresses". What other type of address could possibly be configured to identify a single Ethernet device on a LAN?)
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When sending IP packets, and using the Type / Length field for length, the Ethernet frame has what additional headers?
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LLC header
SNAP header |
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In a modern Ethernet frame, a value of less than hex 0600 in the Type / Length field means what?
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The field is used for length, and another field will be included to specify type
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Where are the LLC and SNAP headers located in an Ethernet frame containing an IP packet?
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After the 802.3 header (standard Ethernet header), before the Data and Pad field
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FCS stands for?
and is located where? |
Frame Check Sequence
located in the Ethernet frame trailer (it is the only field in the Ethernet trailer) |
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Summarize CSMA/CD logic in 2 steps
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Wait until no devices are sending, in order to start sending a frame.
If a collision occurs, wait a random amount of time and try again. |