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25 Cards in this Set
- Front
- Back
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You are asked to upgrade a bus topology LAN at a friend’s house to a star topology LAN. Your friend wants to connect three computers and a printer and use the Ethernet access method. His computers do not contain wireless NICs. At minimum, which of the following devices must you add to his current networking hardware?
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c. hub
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What kind of topology is susceptible to signal bounce?
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b. bus
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Which network access method relies most often on a star-wired bus physical topology?
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a. Ethernet
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What is the logical topology used by FDDI networks?
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c. ring
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How do workstations in a ring topology negotiate which node has the authority to transmit data at any given time?
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d. by using tokens
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Which of the following is a potential problem with daisy-chaining hubs on a 10BASE-T network?
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a. exceeding the maximum network length
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When a wireless workstation is using passive scanning, how does it locate an available
access point? |
c. It receives a beacon signal from a nearby access point.
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Why is packet switching more efficient than circuit switching?
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b. In packet switching, packets can take the quickest route between nodes and arrive independently of when other packets in their data stream arrive.
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What happens in CSMA/CD when a node detects that its data has suffered a
collision? |
d. It signals to the network that its data was damaged in a collision, waits a brief period of time before checking the network for activity, and then retransmits the data.
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Why are Ethernet_II frames preferred over Ethernet_802.3 frames on contemporary LANs?
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a. because they can support multiple higher-layer protocols, and Ethernet_802.3 frames cannot
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What is the purpose of padding in an Ethernet frame?
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d. ensuring that the data portion of the frame totals at least 46 bytes
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On a 100BASE-TX (Fast Ethernet) network, what is the maximum number of hubs that can be connected along the bus of a star-wired bus topology?
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a. two
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Which two of the following might cause excessive data collisions on an Ethernet
network? |
b. The overall network length exceeds IEEE 802.3 standards for that network type.
e. A server on the network contains a faulty NIC. |
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What are the minimum and maximum sizes for an Ethernet frame?
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c. 64 and 1518 bytes
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What is the term for a hub used on a Token Ring network?
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a. Multistation Access Unit
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Which two of the following are disadvantages to using Token Ring networks rather
than Ethernet networks? |
b. Their maximum throughputs are lower than Ethernet.
c. They require more expensive connectivity equipment than Ethernet |
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Which of the following network access methods does not use packet switching?
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d. ATM
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What type of Physical layer is required for FDDI?
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b. a dual ring of single-mode or multimode fiber
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A large university campus that provides wireless network access from its dorms, libraries, and lecture halls prohibits students from setting up their own access points. What’s the most likely reason for this policy?
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b. for security, to prevent the potential for unauthorized access points to accept
associations from wireless nodes on campus and capture their traffic |
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What is one advantage to ATM’s use of cells, compared to Ethernet’s use of frames?
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d. They enable ATM to provide predictable traffic patterns.
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the 802.11 standard, IEEE specifies what type of access method?
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a. CSMA/CA
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Which of the following 802.11 transmission requirements contributes to its
inefficiency? |
c. A destination node must issue an acknowledgment for every packet that is received intact.
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What is the theoretical maximum throughput for Wi-Fi?
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d. 11 Mbps
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What frequency range is used by Bluetooth, 802.11b, and 802.11g?
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b. 2.4 GHz
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Why are the 802.11b and 802.11g wireless transmission technologies more commonly used on business LANs than Bluetooth? (Choose two answers.)
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b. 802.11 signals travel farther than Bluetooth signals.
e. 802.11 technologies transmit data at higher throughputs than Bluetooth. |
