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Which of the following is NOT true about 2.5/5GBaseT Ethernet?


A) It is defined by 802.3bz.
B) It requires at least Cat 6A cabling.
C) It has a maximum distance of 100 meters.
D) It can be used as an uplink for 802.11ac networks.

E) C) and D)
F) B) and D)

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A collision can occur on a switch only if the switch is operating in full-duplex mode.

A) True
B) False

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What is the hidden node problem on Wi-Fi networks and what can be used to counteract the problem?

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It's quite possible that in a three-station wireless network, all workstations can communicate with the AP: For example, workstation A can hear workstation B and workstation B can hear workstation C, but workstation A can't hear workstation C, perhaps because the two are out of range. This situation is called the hidden node problem. CSMA/CA doesn't work because workstation A never knows whether workstation C is sending, and vice versa. To counteract this problem, the 802.11 standards specify another feature that uses handshaking before transmission. If this feature is enabled, a station must send the AP a request-to-send (RTS) packet requesting transmission. If it's okay to transmit, the AP sends a clear-to-send (CTS) message, and the workstation starts its communication. All other devices communicating with the AP hear the exchange of RTS and CTS messages, informing them that another device has control of the medium.

What happens to Wi-Fi signals when they pass through solid objects like walls?


A) Diffraction occurs and the signals are amplified.
B) Scattering and multipath occurs.
C) Absorption occurs and the signals attenuate.
D) Reflections occur causing attenuation.

E) A) and D)
F) A) and B)

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What is the difference between a network's physical topology and its logical topology?

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The physical topology of a network refer...

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Which of the following is the physical topology that is daisy-chained like a bus where the cabling is brought around from the last device to the first device?


A) physical bus
B) physical star
C) physical ring
D) point-to-point

E) A) and C)
F) All of the above

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The physical bus topology is no longer used because it required extra cable and a central device to connect all the computers.

A) True
B) False

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Match each item with a statement below. a.logical topology b.physical topology c.mesh topology d.point-to-point topology e.collision f.CSMA/CA g.CSMA/CD h.media access method i.broadband j.baseband -direct connection between two devices

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Which of the following is NOT a characteristic of Unshielded Twisted Pair cabling?


A) contains four pairs of copper wire
B) susceptible to electrical interference
C) maximum speed is 100 Mbps
D) comes in numbered categories

E) A) and C)
F) B) and C)

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What type of logical topology is at work when using an Ethernet hub?


A) logical bus
B) logical ring
C) switched topology
D) hierarchical topology

E) None of the above
F) A) and B)

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A

A network's logical topology often depends on the central device's electronics.

A) True
B) False

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Which of the following is NOT an advantage of a physical star?


A) easier network upgrades
B) centralized monitoring and management of traffic
C) use of faster technologies
D) single point of failure

E) A) and D)
F) A) and C)

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Which of the following is true about collisions?


A) They can only happen with switches.
B) They are a problem with Token Ring networks.
C) They can occur on Ethernet half-duplex networks.
D) Fewer computers means more collisions.

E) B) and C)
F) None of the above

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What is the most common topology and technology combination in use today?


A) logical bus / Ethernet
B) logical bus / wireless LAN
C) logical ring / token ring
D) switched / Ethernet

E) C) and D)
F) B) and C)

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Match each item with a statement below. a.logical topology b.physical topology c.mesh topology d.point-to-point topology e.collision f.CSMA/CA g.CSMA/CD h.media access method i.broadband j.baseband -sends a digital signal using the entire bandwidth

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j

In a large network, in which several switches need to be connected together, usually one device is placed at the center, forming a(n) ____________ star.

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Which Ethernet standard specifies speeds of 40 and 100 Gbps and can run up to 7 meters over copper?


A) 802.3ae
B) 802.3z
C) 802.3u
D) 802.3ba

E) None of the above
F) All of the above

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With which kind of Wi-Fi antennas does the signal radiate out with equal strength in all directions?


A) Omnidirectional
B) Unidirectional
C) Multidirectional
D) Semidirectional

E) B) and C)
F) All of the above

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With a ___________________ antenna, signals are focused in a single direction, which makes them ideal for placement at one end of long, narrow spaces or to cover distances between buildings.

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When a wireless computer connects with an AP before it connects with other devices, it is operating in ____________ mode.

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