Which of the following statement about the VPNv4 address is wrong?

• A.The VPNv4 address has a total of 12 bytes, including an 8-byte route identifier RD (Route Distinguisher) and a 4- byte IPv4 address prefix.
• B.By default, the PE does not perform vpn-target filtering on the received VPNv4 routes.
• C.Before the local PE advertises the VPNv4 route learned from the site directly connected to itself to other PEs, it sets the Target attribute for these routes and advertises it as a BGP extended community attribute along with the route.
• D.When BGP advertises reachable and unreachable VPNv4 routes, it carries the RD attribute.

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If there is a LAN running the 802.1D Spanning Tree Protocol, which of the following parameters will the non-root switch not receive from the root switch?

• A.Hello time
• B.MaxAge
• C.Forward delay
• D.Root cost
• E.Hold time

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A bookstore provides a wired network for customers to learn online. However, some users are found unable to access the network one day. After checking, the IP resource of the DHCP address pool has been exhausted. Which of the following is the best way to solve the current problem?

• A.Limit the maximum number of DHCP snooping binding entries that an interface can learn.
• B.Configure IPSG
• C.Configure a static ARP binding table.
• D.Configure DAI

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Which of the following statement about the NSSA area is correct?

• A.In the hello message sent by OSPF neighbor in NSSA region, position N is 1 and position E is 0 in option field
• B.In the hello message sent by OSPF neighbor in NSSA region, position N is 0 and position E is 1 in option field.
• C.The NSSA region generates Type 7 LSA to inform external routing, and the FA address role in the Type 7 LSA is to prevent loops
• D.The NSSA region will automatically generate a default LSA to access the external network.

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ISIS authentication types include interface authentication, area authentication, and routing domain authentication.

• A.False
• B.True

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