Which of the following statements about VPNv4 addresses is wrong?

• A.The VPNv4 address has a total of 12 bytes, including the 8-byte Route Distingulisher (RD) and the 4-byte IPv4 address prefix.
• B.Before the local PE advertises the VPNv4 routes learned from the sites directly connected to it to other PEs, it will set the Export Target attribute for these routes and advertise them with the routes as the extended community attribute of BGP.
• C.When BGP advertises reachable and unreachable VPNv4 routes, it will carry the RD attribute.
• D.By default, PE will not perform VPN-target filtering on received VPNv4 routes.

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If the value of the Option field in the 0SPFv3 Hello packet sent by the GigabitEthermet 0/0/0 interface on the router is 0x000013, which of the following descriptions are correct? (Multiple Choice)

• A.GigabitEthernct0/0/0 port of Router A belongs to the NSSA area.
• B.The router is an OSPFv3 device with forwarding capability.
• C.Router A supports AS-External-LSA flooding
• D.Gigabit/thernet0/0/0 port of Router A will participate in IPv6 route calculation.

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Which of the following description about the VRRP timer is wrong? (Multiple choice)

• A.Skew Time=(255- Priority)/255
• B.MASTER DOWN=(3* ADVER_INTERVAL)+Skew_time
• C.By default, the VRRP preemption delay is 1 second
• D.By default, the time period for VRRP notification messages is 2 seconds

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The IS-ISL eve 1-1 neighbors of R3 and R4 are not established. According to the information in this figure, what are the possible reasons?
[R3] display isis error Hello packet errors: ... ... Repeated System ID: 0 Bad Circuit Type 0 Bad TLV Length: 0 Zero Holding Time 0 Unusable IP Addr: 0 Repeated IPv4Addr 0 Mismatched Area Addr ( L 1 ) :13 Mismatched Proto 0 SNPA Conflicted(L AN): 0 Mismatched Level 0 Mismatched Max Area Addr: 0 Bad Authentication 0 ... ... [R3]

• A.IH certification of R3 and R1 failed
• B.The circuit-type of the interconnection interface between R3 and R4 does not match
• C.R3 and R4 have different area codes
• D.IS-Levels of R3 and R4 do not match

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What improvements have been made to the IGMPv2 protocol compared to IGMPv1? (Multiple Choice)

• A.Added specific source group query messages
• B.Added maximum response time field
• C.Added specific group query message
• D.Added off-group messages

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