The following are about 802.1x authentication. What are the correct statements about RADIUS authentication and HWTACACS authentication?

• A.RADIUS authentication and WTACACS authentication are mutually exclusive, and dual authentication cannot be performed for the same user at the same time.
• B.Users can use 802.1x authentication to access the network, RADIUS completes authentication.
• C.RADIUS authentication and 802.1x authentication are mutually exclusive.
• D.RADIUS authentication and HWTACACS authentication can perform dual authentication for the same user at the same time, which is more secure.

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Which of the following about the characteristics of multi-instance CE is incorrect?

• A.due to MThe CE device is already bound to the VPN, so there is no need to bind the VPN to the PE connected to the MCE device.
• B.MCEThe device can determine the source of the routing information according to the interface that receives the routing information, and maintain it in the routing forwarding table of the corresponding VP.
• C.configureMCE,A CE can be connected to multiple VPNs at the same time, which not only realizes complete isolation of services between different VPN users, but also reduces the investment cost of network equipment.
• D.The implementation principle of MCE is to create its own routing and forwarding table for different VPNs on the MCE device and bind it to the corresponding interface.

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IS-IS is a link-state routing protocol. Uses SPF. The algorithm performs routing calculation. As shown in the figure, a campus has deployed IPv4 at the same time.4 and IPv46 and run IS-IS realize network interconnection, among whichR2 Only IPv4 is supported, close. Which of the following statements is true regarding the topology calculation of this network?

• A.By default, IPv6 In the shortest path tree formed by network calculation,R1 accessR4 The path is
  .R1-R2-R4, becauseR2 IPv6 is not supported, soR2 Receive IPv46 The packet will be discarded directly, resulting in loss of traffic.
• B.By default, sinceR2 IPv6 is not supported, so IPv66 In the shortest path tree formed by the network calculation, R1 accessR4 The path is . R1-R3-R4
• C.By default, IPv4 and IPv46 The network will be calculated separately to form different shortest path trees
• D.if you wish IPv44 and IPv46 The network computations form the same shortest path tree, which needs to be passed through ipv6 enable topology ipv6 Order enable IS-IS IPv4 under process6 Ability

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If the advertised route entry is deleted on the BGP router, the BGP router will be triggered to send an Update message for route revocation. Well-known mandatory attribute with revoked routing entries.

• A.false
• B.True

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RD is used to distinguish the same IP address in different VPNs. How many bits does RD contain?

• A.64
• B.32
• C.16
• D.128

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