The OSPFv3 Option field appears in all LSA.

• A.False
• B.True

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Now, the switch MAC address table is empty by default configuration. The host A connected to the switch sends the first unicast data frame. What operation will the switch perform after receiving the data frame?

• A.The switch forwards the data frame out of an interface according to the destination MAC address of the data frame.
• B.The switch will discard the data frame
• C.The switch caches the data frame and waits for the destination host to send the data frame and then forward it.
• D.The switch records the source MAC address of the data frame and floods the data frame.

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If you run the PM-SM protocol on the multicast network, you need to configure the RP. The configuration mode of the RP is classified into dynamic RP and static RP. Which of the following description of the RP configuration is correct?

• A.When configuring a dynamic RP, you need to configure the BSR as the backup of the RP.
• B.When configuring a static RP, you need to configure the BSR advertisement RP information.
• C.When configuring a dynamic RP, you do not need to configure a BSR.
• D.When configuring a static BP, you need to specify the RP information on all PIM routers.

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When a packet is forwarded to the public network in the MPLS BGP VPN network in the domain, it will be encapsulated with two layers of MPLS labels. Which of the following description about the two-layer label is wrong?

• A.The private network label is carried and distributed when the route is delivered by MP-BGP. The public network label is distributed by the LDP protocol.
• B.By default, the router assigns the same label value to all VPNv4 routes destined for the peer PE.
• C.The export PE uses the inner label when determining which export CE the message should be sent to.
• D.MPLS BGP VPN uses two-layer label public network label (also known as outer label) and private network label (also known as inner label).

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The LAND attack is performed by the attacker sending a source address and a destination address to the destination host as the destination host. The source port and the destination port are the same SYN packet. When the receiver waits for the final ACK packet from the sender, the connection is always in a semi-connected state, resulting in waste of limited TCP resources at the receiving end.

• A.True
• B.False

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