The correct statement about the difference between OSPFv2 and OSPFv3 is ? Multi-select

• A.OSPFv3 is similar to OSPFv2 in that it uses a multicast address as the OSPF message destination address
• B.OSPFv2 has the protocol number 89 in the IPv4 packet header, OSPFv 3 The next number in the IPv6 message header is 89
• C.The same type of message exists in OSPFv2, OSPFv3: Hello, DD, LSR, LSU, LSAack, Their message format is the same
• D.BOTH OSPFv2 and OSPFv3 support interface authentication. And OSPFv3 authentication is still based on the fields in the ospf message header

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When an administrator configures VRRP, which of the following is not required?

• A.Virtual IP address
• B.Preemption delay
• C.Preemption mode
• D.Priority of the virtual router

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The following statement about the security alliance SA in IPSec is incorrect

• A.A two-way SA must exist between IPSec peers to establish an IPSec VPN connection
• B.Use the display ipsec command to view the encryption algorithm used with another IPSec peer, the traffic of interest, and so on.
• C.SA is uniquely identified by a triple that includes the security parametric reference SPI (Security Parameter Inder), the source IP address, and the security protocol number (AH or ESP)
• D.IPSec only supports encrypting data using symmetric encryption algorithms.

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The following statement about the concept of multicast is wrong?

• A.Multicast Source: The sender of the message needs to join the multicast group to provide forwarding of multicast group messages
• B.Multicast Groups: A collection identified by ip multicast addresses
• C.Multicast Group Members: Multicast group members can be widely distributed anywhere in the network
• D.Multicast router: A router or layer-three switch that supports layer-3 multicast functionality

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If you need to configure routing policies on one router. Which of the following parameters does an administrator use to route when deploying a routing policy?( Multiple select).

• A.Application
• B.Size of the packet
• C.Identification of a specific terminal system
• D.Protocol
• E.Throughput

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