QUESTION: 21

Which of the following statements regarding collision is incorrect?

Reduce the number of hosts in a network can decrease probability of collision.
Each ports of switch is an independent collision domain.
The collision that happens in the network connected with one port of a switch will affect another network connected with another port of the switch.
The number of the collision domains will be increased if the hub in the network is replaced with the bridge.

Answer(s): C

QUESTION: 22

A MAC address consists of 48 bits and is generally expressed in 12-bit dotted decimal notation. What kind of address does a MAC address consisting of all 1s stand for?

Virtual address
Multicast address
Broadcast address
Unicast address

Answer(s): C

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QUESTION: 23

Which of the following are the advantages of RSTP compared with STP? (Select multiple)

If the designated port is connected with P2P link, it can make a handshake with the connected bridge and enter the forwarding state immediately after it receives a response.
Once a port of the switch which is configured as edge port has been enabled, it will become designated port immediately and transit to forwarding state.
If the designated port is connected with P2MP link, it can make a handshake with the connected bridge and enter the forwarding state immediately after it receives a response.
A new root port is elected on the non-root switch and the previous old root port is no longer in forwarding state. Moreover the designated port of the segment which connects with the new root port already starts to forward the data. In this case, the new root port can enter forwarding state immediately.

Answer(s): A,B,D

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During STP calculation, when a port is in a certain state, it neither forwards any data frame nor learns MAC address labels. Instead, it only receives and processes STP protocol packets. Which state does the abovementioned state refer to?

Listening
Forwarding
Learning
Blocking

Answer(s): D

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