The Certkiller network administrator needs to determine what LAN devices to install on the
Certkiller network. What are two advantages of using Layer 2 Ethernet switches over hubs?
(Choose two)
A.
Allowing simultaneous frame transmissions
B.
Increasing the size of broadcast domains
C.
Increasing the maximum length of UTP cabling between devices
D.
Filtering frames based on MAC addresses
E.
Decreasing the number of collision domains
The purchasable Test King program lists the wrong answer for this question. The answer in the program calls “Filtering frames by MAC address” and “decreasing the number of collision domains” correct. What’s worse is that they back it up with the following explanation: “The whole point of a switch is to reduce the number of collision domains, so obviously E, decreasing the number of collision domains is one of the more correct answers.”
This is just embarrassing. It’s one thing to note an incorrect answer on a more obscure and complex CCNA concept, like fat-fingering a command under NAT overload configurations, but this is a layer 2 101 concept. And then to back it up with a bogus explanation stating “the whole point of switches is to reduce the number of collision domains” is just humiliating.
The correct answer, is A&D, as this version of the question states. Switches INCREASE the number of collision domains – one per port. Hubs only have one collision domain. Why would a technology more advanced (switches) than hubs want to REDUCE the number of collision domains, if hubs only have one and are inefficient? If the answer read; “reduce the number of collisions,” then it would be right. But not “reduce collisiion DOMAINS.”
$99 for a license to use this program for 4 months, you would think they would at least get the easy ones right.
Hub is considered a layer 1 device. When a packet arrives at one port, it is copied to the other ports without checking the content of that packet.
Switch operates at layer 2. When a packet arrives at one port, it checks in its database (based on MAC address) to see which port it should forward that packet out -> D is correct.
Remember that hubs can only communicate in half duplex mode, which means that a computer can only send data when it is not receiving. Switches can run in full duplex mode, which allows data to be sent and received at the same time. Switches effectively double the speed of the network when compared to hubs -> A is correct.
The most comune error about this question that people do is :
E – Decreasing the number of collision domains
Correct answer are A&D
in the test king Program lists the wrong answer as E& D
I thank the correct answer should be A&D
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