A.After the two-layer switch divides VLANs, hosts in different VLANs can use routers to realize communication. The method is that there is a physical interface and a physical connection between the router and each VLAN.

B.The hosts in the VLAN divided by the switch can communicate, but the hosts in the VLAN cannot communicate

C.After the three-layer switch divides VLANs, hosts in different VLANs can communicate. The method is that the three-layer switch creates a virtual three-layer VLAN interface for each VLAN, and the VLAN interface needs to be configured with the corresponding IP address

D.After the two-layer switch divides VLANs, hosts in different VLANs can communicate with the router by using an interface to connect the trunk port of the switch, and the router must support the 802.1Q protocol

A.The problem of out-of-sequence arrival of multicast packets can be corrected

B.Repeated data packet reception

C.Do your best to deliver, cannot guarantee low-latency application requirements

D.No congestion control

A.The address of the first host of the multicast group to send a Report message

B.Number of multicast group Report packets

C.Multicast group IGMP querier

D.Multicast group information maintained by the router

A.STP is used to construct the shortest path between two nodes in the LAN

B.STP is used to eliminate data link layer loops in LAN

C.STP is mainly used in token ring networks

D.When the active link fails, STP can activate the redundant link and restore network connectivity

A.The HelloTime should be adjusted to the maximum value and the Forward Delay to the minimum value. This can reduce the number of Hello messages in the network and the port can enter the forwarding state as soon as possible

B.A proper Helloinme value can reduce the computational loss of the spanning tree while enhancing the robustness of the spanning tree. If the value is too large or too small, it will affect the generation of the spanning tree calculation and the stability of the network.

C.It is not recommended to manually configure Hello Forward Delay and Max Age, the switch will automatically set a better value for the timer through the network diameter value

D.MaxAge should be adjusted to the minimum value, which can shorten the aging time of BPDUs and detect link failures in time