Regarding multicast and IPTV, which of the following statements is incorrect?

Multicast refers to the form of point-to-multipoint communication in the network
The core of multicast technology is to place the message copy work as close as possible to the receiver to complete it, reducing the data traffic on the network.
Through the introduction of controlled multicast, the management and control of multicast users are completed on the DSLAM equipment,
IPTV is a way of video on demand

Answer(s): D

Which of the following statements is correct?

LAN Switch is mainly to find the corresponding IP address according to the MAC address of the data packet to realize the forwarding of the data packet.
The LAN Switch may not recognize the MAC address, but must recognize the IP address.
Compared with shared Hub, a port of LAN Switch can be said to be a separate conflict domain.
When the LAN Switch receives a data packet containing an unrecognized MAC address, it sends the data packet directly back from the received port.

Answer(s): C

Regarding the use of ADSL interleaving mode, which of the following statements is correct?

Answer(s): A

Regarding the ATM network, which one of the following descriptions is wrong?

Support fixed-length exchange
Working in the network layer of the OSI model
Reduce the processing time of intermediate nodes and support high-speed transmission
Can guarantee the quality of service performance index (QOS) of various businesses

Answer(s): B

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