Refer to the graphic.

Four switches are operating using STP. One of the port interfaces on ROOT has failed.
How long will it take for the 'blocked' interface to change to a state of forwarding?

• A.3 seconds.
• B.30 seconds
• C.15 seconds.
• D.50 seconds

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Refer to the graphic.

Packet encapsulation in the IPsec architecture is performed as shown.
Which IPsec mode is being used to encapsulate the packet?

• A.tranport mode
• B.tunnel mode.
• C.normal mod
• D.this encapsulation is wrong.

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Which of the following parameters are used in the switched network that runs the STP protocol when performing spanning tree calculations? (Multiple Choice)

• A.Root path cost
• B.Port ID
• C.Bridge ID
• D.Forward Delay

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Which of the following description of the role of the free ARP message is wrong?

• A.Used to check duplicate IP addresses: Normally, no ARP response will be received. If received, it indicates that there is an address in the network that is duplicated with its own IP address.
• B.Used to advertise the active/standby switchover in the VRRP backup group.
• C.Free ARP packets are used to keep active with the gateway device when the host is idle.
• D.Used to advertise a new current AC address: The sender replaces the NIC and the AC address changes. In order to notify all hosts before the AP entry ages, the sender can send a free ARP.

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In the OSPF protocol, which of the following description of the DR is correct? (Multiple Choice)

• A.By default, all routers in this broadcast network will participate in DR elections.
• B.If the priority values of the two routers are different, select the router with the smaller priority value as the DR.
• C.If the priority values of the two routers are equal, select the router with the large router ID as the DR.
• D.The adjacency relationship must also be established between the DR and the BDR.

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