Network+ Chapter 4

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  1. Explain back-off-timer and what methodology is it used in.
    Back-off-timer is the technology used when a network device notices a collision of its data on the wire, it is the time waited to retransmit its data.
  2. What is the name of the procedure utilitizing back-off-timer methodology?
    Carrier Sense Multiple Access/Collision Detection (CSMA/CD)
  3. Explain the break down of CSMA/CD
    • Carrier Sense is the devices method of listening on the wire to ensure no data frames are being transmitted.
    • Multiple Access is the philosophy that all eligible devices have simultaneous access the network segment.
    • Collision Detection is 
    • when a network device notices a collision of its data on the wire, it is the time waited to retransmit its data.
  4. What is said to be a collision domain?
    All devices on a share ethernet segment.
  5. What improved the scalability of ethernet networks?
    Ethernet switches by creating multiple collision domains because each port on an ethernet switch is its own collision domain.
  6. Identify the distance limitation of a 10BASE5 Ethernet network.

    A. 185 m
    B. 500 m
    C. 100 m
    D. 2 km
    B. 500 m
    (this multiple choice question has been scrambled)
  7. If two devices simultaneously transmit data on an Ethernet network and a collision occurs, what does each station do in an attempt to resend the data and avoid another collision?

    A. Each device randomly picks a priority value, and the device with the highest value transmits first.
    B. Each device sets a random back off timer, and the device will attempt retransmission after the timer expires.
    C. Each device waits for a clear to send (CTS) signal from the switch.
    D. Each device compares the other device’s priority value (determined by IP address) with its own, and the device with the highest priority value transmits first.
    B. Each device sets a random back off timer, and the device will attempt retransmission after the timer expires.
    (this multiple choice question has been scrambled)
  8. What kind of media is used by 100GBASE-SR10 Ethernet?

    A. MMF
    B. UTP
    C. SMF
    D. STP
    A. MMF
    (this multiple choice question has been scrambled)
  9. Which of the following statements are true regarding VLANs? (Choose two.)

    a. A VLAN has a single broadcast domain.
    b. For traffic to pass between two VLANs, that traffic must be routed.
    c. Because of a switch’s MAC address table, traffic does not need to be routed to pass between two VLANs.
    d. A VLAN has a single collision domain.
    • a. A VLAN has a single broadcast domain.
    • b. For traffic to pass between two VLANs, that traffic must be routed.
  10. What name is given to a VLAN on an IEEE 802.1Q trunk whose frames are not tagged?

    A. Management VLAN
    B. Default VLAN
    C. VLAN 0
    D. Native VLAN
    D. Native VLAN
    (this multiple choice question has been scrambled)
  11. In a topology running STP, every network segment has a single ______________ port, which is the port on that segment that is closest to the root bridge, in terms of cost.

    A. Non-root
    B. Designated
    C. Non-designated
    D. Root
    B. Designated
    (this multiple choice question has been scrambled)
  12. What is the IEEE standard for link aggregation?

    A. 802.3af
    B. 802.1d
    C. 802.1Q
    D. 802.3ad
    D. 802.3ad
    (this multiple choice question has been scrambled)
  13. What is the maximum amount of power a switch is allowed to provide per port according to the IEEE 802.3af standard?

    A. 7.7 W
    B. 26.4 W
    C. 15.4 W
    D. 32.4 W
    C. 15.4 W
    (this multiple choice question has been scrambled)
  14. What switch feature allows you to connect a network sniffer to a switch port and tells the switch to send a copy of frames seen on one port out the port to which your network sniffer is connected?

    A. Port redirect
    B. Port mirroring
    C. Port duplexing
    D. Port interception
    B. Port mirroring
    (this multiple choice question has been scrambled)
  15. Which IEEE 802.1X component checks the credentials of a device wanting to gain access to the network?

    A. Supplicant
    B. Authenticator
    C. Authentication server
    D. Access point
    C. Authentication server
    (this multiple choice question has been scrambled)
  16. What was the original intent of ethernet created by Xerox?
    To connect computers to laser printers.
  17. Explain the components of 10Base5.
    The 10 in 10BASE5 referred to network throughput, specifically 10 Mbps (that is, 10 million (mega) bits per second). The BASE in 10BASE5 referred to baseband, as opposed to broadband
  18. What is the bandwidth, media type and distance limitation of 10Base5.
    10Mbps, Coaxial (Thicknet), 500m
  19. What is the bandwidth, media type and distance limitation of 10Base2
    10Mbps, Coaxial (Thinnet), 185m
  20. What is the bandwidth, media type and distance limitation of 10BaseT
    10Mbps, Cat3 (UTP), 100m
  21. What is the bandwidth, media type and distance limitation of 10BaseTX
    100Mbps, Cat5 (UTP), 100m
  22. What is the bandwidth, media type and distance limitation of 10BaseFX
    100Mbps, MMF, 2km
  23. What is the bandwidth, media type and distance limitation of 1000BaseT
    1Gbps, Cat5e (UTP), 100m
  24. What is the bandwidth, media type and distance limitation of 1000BaseTX
    1Gbps, Cat6 (UTP), 100m
  25. What is the bandwidth, media type and distance limitation of 1000BaseLX
    1Gbps, MMF/SMF, 5km
  26. What is the bandwidth, media type and distance limitation of 1000BaseLH
    1Gbps, SMF, 10km
  27. What is the bandwidth, media type and distance limitation of 1000BaseZX
    1Gbps, SMF, 70km
  28. What is the bandwidth, media type and distance limitation of 10GBaseSR
    10Gbps, MMF, 26-82km
  29. What is the bandwidth, media type and distance limitation of 10GBaseLR
    10Gbps, SMF, 10km
  30. What is the bandwidth, media type and distance limitation of 10GBaseER
    10Gbps, SMF, 40km
  31. What is the bandwidth, media type and distance limitation of 10GBaseSW
    10Gbps, MMF, 300m
  32. What is the bandwidth, media type and distance limitation of 10GBaseLW
    10Gbps, SMF, 10km
  33. What is the bandwidth, media type and distance limitation of 10GBaseEW
    10Gbps, SMF, 40km
  34. What is the bandwidth, media type and distance limitation of 10GBaseT
    10Gbps, Cat6a, 100m
  35. What is the bandwidth, media type and distance limitation of 100GBaseSR10
    100Gbps, MMF, 125m
  36. What is the bandwidth, media type and distance limitation of 100GBaseLR4
    100Gbps, SMF, 10km
  37. What is the bandwidth, media type and distance limitation of 100GBaseER4
    100Gbps, SMF, 40km
  38. On a basic switch configuration, all ports on a switch belong to what?
    Broadcast domain
  39. What is the most popular IEEE trunking standard?
    IEEE 802.1Q
  40. How are other VLANs differentiated from the Native VLAN?
    They are tagged
  41. How do layer 3 packets differ from layer 2 frames?
    layer 2 frames do not have Time-to-live TTL
  42. What is IEEE 802.1D?
    Spanning Tree Protocol (STP), allows networks to layer 2 loops whiles not allowing them to spill over to other ports.
  43. The IEEE standard that allows a maximum of 15.4 watts of power is what?
    IEEE 803.af
  44. What IEEE standard affords 32.4 watts of power and enable PoE?
    IEEE 802.3at
  45. What standard enforces user authentication?
    IEEE 802.1X
  46. A device that wants to gain access to a network is called what?
    Supplicant
  47. What forwards the supplicant's request to the authentication server?
    Authenticator
  48. What does the authenticator do after the authentication server grants access?
    It receives a key and establishes a secure session with the supplicant.
  49. What name is given to a VLAN on an IEEE 802.1Q trunk whose frames are not tagged?

    A. Native VLAN
    B. VLAN 0
    C. Management VLAN
    D. Default VLAN
    A. Native VLAN
    (this multiple choice question has been scrambled)
  50. What is IEEE 802.3 standard?
    Ethernet - developed by Xerox in 1973 as a solution to communicate with printers.
  51. The first iteration of Ethernet was 10Base5,
    explain what this means?
    • 10 represents the throughput, 10Mbps.
    • Base represent Baseband.
    • 5 represents the distance limitation 5 meters.
  52. What was 10Base5 also called?
    Thicknet
  53. Explain 10Base2.
    • Also called thinnet or cheapernet. 
    • The 2 represents the 2meter limitation, which is actually 185meters.
  54. Explain the bandwidth speeds by Ethernet type.
    • Ethernet - 10Mbps (10 million bits per second)
    • Fast Ethernet - 100Mbps
    • Gigabit Ethernet - 1Gbps
    • 10 GB Ethernet - 10 Gbps
    • 100 GB Ethernet - 100 Gbps
  55. What is a GBIC and a SFP?
    • GigaBit Interface Converter (GBIC)
    • Small Form-Factor Pluggable (SFP)
  56. Why is 100BaseT and 100BaseTX confusing?
    100BaseT is not a specific standard but rather a category of standards.  The same is true with 100BaseSE-X
  57. What is a root bridge?
    A switch elected to act as a reference point for a spanning tree.  The SW with the lowest Bridge ID (BID) is elected root bridge.
  58. What is a nonroot bridge?
    All other SW in the STP topology are considered nonroot bridges.
  59. What are the port costs on Long STPs?
    2,000,000 for 10Mbps to as little as 2 for 10Tbps.
  60. Which SW will be elected root bridge and why?


    Image Upload 1
    SW with MAC address AAAA will be root bridge because port IDs are the same (32768) so the lowest MAC address becomes root.
  61. What are the various port costs for link speeds?
    • Link Speed                                 STP port cost
    • 10Mbps (Ethernet)                     100
    • 100Mbps (Fast Ethernet)           19
    • 1Gbps (Gigabit Ethernet)           4
    • 10Gbps (10-Gigabit Ethernet)    2
  62. What is IEEE 802.1X?
    Standards-based method for enforcement of user authentication.
  63. What are the three primary components of an IEEE 802.1X network?
    • Supplicant - the device requesting access to the network.
    • Authenticator - That or Who submits the supplicant for authentication.
    • Authentication server
  64. With 100BaseT, what is the max distance between the hub (or switch) and the node?

    A) 100Gbps, SMF, 10km
    B) 100Gbps, SMF, 10km
    C) 10Gbps, MMF, 26-82km
    D) Ethernet - developed by Xerox in 1973 as a solution to communicate with printers.
    A) 100Gbps, SMF, 10km
    (this multiple choice question has been scrambled)
  65. What type of cable and connector does 100BaseFX use?

    A) Multimode fiber with ST or SC connectors
    B) Multimode fiber with ST or SC connectors
    C) STP CAT6 with RJ-45 connectors
    D) Single-mode fiber with MT-RJ connectors
    B) Multimode fiber with ST or SC connectors
    (this multiple choice question has been scrambled)
  66. How many pairs of wires do 10BaseT and 100BaseT use?

    A) 4
    B) 3
    C) 2
    D) 1
    C) 2
    (this multiple choice question has been scrambled)
  67. What standard does IEEE 802.3ab describe?

    A) 1000BaseT
    B) 1000BaseLX
    C) 1000BaseSX
    D) 100BaseT
    A) 1000BaseT
    (this multiple choice question has been scrambled)
  68. What is the big physical difference between 1000BaseSX and 100BaseFX

    A) 1000BaseSX is single-mode, whereas 100BaseFX is multimode.
    B) 1000BaseSX uses the SC connector exclusively.
    C) 1000BaseSX uses the ST connector exclusively.
    D) There is no difference.
    C) 1000BaseSX uses the ST connector exclusively.
    (this multiple choice question has been scrambled)
  69. What is the max distance for 1000BaseLX without repeaters?

    A) 2500 meters
    B) 1 mile
    C) 5000 meters
    D) 20,000 feet
    C) 5000 meters
    (this multiple choice question has been scrambled)
  70. What is the big advantage to using fiber-optic?

    A) Fiber is not affected by EMI.
    B) All that orange fiber looks impressive in the network closet.
    C) Fiber is common glass; therefore, it's less expensive.
    D) Making custom cable lengths is easier with fiber.
    A) Fiber is not affected by EMI.
    (this multiple choice question has been scrambled)
  71. How many wire pairs does 1000BaseT use?

    A) 3
    B) 4
    C) 1
    D) 2
    B) 4
    (this multiple choice question has been scrambled)
  72. What is the standard connector for the 10GbE fiber standard?

    A) There is no standard
    B) SC
    C) MT-RJ
    D) ST
    A) There is no standard
    (this multiple choice question has been scrambled)
  73. What is the max cable length of 10GBaseT on CAT6?

    A) 100 meters
    B) 55 meters
    C) 20 meters
    D) 70 meters
    B) 55 meters
    (this multiple choice question has been scrambled)
Author
ID
319300
Card Set
Network+ Chapter 4
Description
Ethernet
Updated
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