Which three statements are true about the operation of a full-duplex Ethernet network? (Choose three.)
A.
There are no collisions in full-duplex mode.
B.
A dedicated switch port is required for each full-duplex node.
C.
Ethernet hub ports are preconfigured for full-duplex mode.
D.
In a full-duplex environment, the host network card must check for the availability of the network
media before transmitting.
E.
The host network card and the switch port must be capable of operating in full-duplex mode.
Explanation:
Explanation/Reference:
Half-duplex Ethernet is defined in the original 802.3 Ethernet and Cisco says you only use one
wire pair with a digital signal running in both directions on the wire. It also uses the CSMA/CD
protocol to help prevent collisions and to permit retransmitting if a collision does occur. If a hub is
attached to a switch, it must operate in half-duplex mode because the end stations must be able to
detect collisions. Half-duplex Ethernet—typically 10BaseT—is only about 30 to 40 percent efficient
as Cisco sees it, because a large 10BaseT network will usually only give you 3- to 4Mbps—at
most.
Full-duplex Ethernet uses two pairs of wires, instead of one wire pair like half duplex. Also, full
duplex uses a point-to-point connection between the transmitter of the transmitting device and the
receiver of the receiving device, which means that with full-duplex data transfer, you get a faster
data transfer compared to half duplex. And because the transmitted data is sent on a different set
of wires than the received data, no collisions occur. The reason you don’t need to worry about
collisions is because now Full-duplex Ethernet is like a freeway with multiple lanes instead of the
single-lane road provided by half duplex. Full-duplex Ethernet is supposed to offer 100 percent
efficiency in both directions; this means you can get 20Mbps with a 10Mbps Ethernet running full
duplex, or 200Mbps for FastEthernet.
Answer:
A) There are no collisions in full-duplex mode.
C) Ethernet hub ports are preconfigured for full-duplex mode.
E) The host network card and the switch port must be capable of operating in full-duplex mode
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You’re wrong O.J. Simpson. Hubs can never support full duplex.
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Answer:
B
D –> CMSDA/CD needs to check the media
E
A –> No True, it can be collisions on a full duplex media if the NIC algorith sends packages at the wrong time, therefore #sh interface shows Output Error –> Collisions
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in a half duplex works CMSDA/CD
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Half Duplex Ethernet Mode
Ethernet IEEE 802.3 standard defines the half duplex; Cisco describes, it uses a digital signal on a wire pair flowing in both tracks on the wire. Half Duplex always employs the Carrier Sense Multiple Access with Collision Domain (CSMA/CD), so that it can retransmit the transmission if collision occurs. Hub always works in half duplex mode. Half duplex Ethernet is not efficient because it has the limit up to 10BaseT, as Cisco describes 10BaseT is not more than 3 to 4Mbps.
Full Duplex Ethernet Mode
On the other hand, full duplex Ethernet employs two pairs of wires. Full duplex always works with the point to point connection between the transmitter of source node and the receiver of destination node. So, full duplex provides the fast data transmission, if we compare to half duplex. Collisions do not occur in the full duplex Ethernet mode because source always sent data on different wires than the received data wires. Full duplex Ethernet mode is 100% efficient for both tracks (receivers & transmitters).
we can deploy full duplex Ethernet mode in the following conditions:
Switch to host connection
Switch to a switch connection
Host to host connection by using crossover cable
for deploying full duplex Ethernet mode:
No collisions in full duplex.
A dedicated port is necessary for each full duplex device.
Host’ network identification card and switch port have to able to operate in full duplex mode.
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