In the packet forwarding of the cross-domain VPN-Option B mode, the two ASBRs will exchange the LSP labels of the public network once.

• A.False
• B.True

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Command ip ip-prefix ip-prefix-name [index indexnumber{permit|deny}ipv4-address mask-length if a prefix list of less-equst has been specified, but greater-equal is not specified, then what is the scope of the prefix?

• A.[0 , less-equal-value]
• B.[mask-lenath , less-equal-value]
• C.No limit
• D.[ess-equal-value , 32]

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Which of the following are the advantages of VLAN aggregation? (Multiple Choice)

• A.Reduce the waste of IP addresses
• B.Increase the number of available VLANs
• C.Realize the isolation of broadcast domains between Sub-VLANs
• D.Increase flexibility of addressing

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Which property subject to the following two conditions?
(1) BGP router A can choose whether to carry this attribute in the Update message.
(2) if the router B receives the packet's attribute Update packet, router B cannot recognize the property, but will also contain the property Update message is advertised by the curved path to c router c possible to identify and use The attribute. (Multiple choice)

• A.Community
• B.Aggregator
• C.laocl_Pref
• D.Mult_Exit_Disc

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The following is the description of the characteristics of the cross domain vpn-Option C, which is correct? (Multiple Choice)

• A.The VPN route is directly exchanged between the ingress PE and the egress PE, and no intermediate device is required to save and advertise the VPN route.
• B.Cross-domain VPN-Option-c mode is not suitable for use when spanning multiple AS.
• C.VPNV4 routes are not saved on the ASBR, and VPNv4 routes are not advertised to each other.
• D.Up to two layers of labels need to be used in the packet forwarding process.

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