If a Huawei switch runs the RSTP protocol, when will the BPDU on a port of the switch be aged?

• A.After MaxAge timed out
• B.After the Forward Delay timed out
• C.On the interface, RSTP does not age BPDUs.
• D.After more than 6 seconds
• E.After the Hold timed out

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For Layer 2 VPN technology, which of the following statements are correct? (Multiple Choice)

• A.BGP EVPN solves the problem of MAC address drift and multi-tenancy that VPLS cannot support.
• B.The VPLS configuration is highly complex. The Layer 2 network transparently transmits BUM packets.
• C.VPLS is a widely used technology on the live network. It can provide Layer 3 packet transparent transmission and achieve multi-point access.
• D.BGP EVPN supports tenant isolation, multi-homing and broadcast suppression

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As shown in the figure, an OSPF network is set up by the company. The links in the figure form OSPF adjacencies. All OSPF devices announce their own loopback addresses. One day S1-R2 and S2-R1 two links suddenly failed. In order to check whether the network is running normally, the engineer performed a device status check. Which of the following descriptions are correct? (Multiple Choice)

• A.R1 can learn the loopback route of R2 normally.
• B.R5 can learn the loopback route of R2 normally.
• C.R3 can learn the loopback route of R2 normally.
• D.R3 cannot learn the loopback route of R2.

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When an administrator wants to manage some routes on the router during operation and maintenance, which of the following tools can mark these routes so that the administrator can configure the policy? (Multiple Choice)

• A.Use ACLs to mark routes on the router.
• B.Use ip-prefix to mark routes on the router.
• C.Use Tag value to mark routes on the router.
• D.If the BGP protocol is running, use the community attribute to mark the route.

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Which of the following statements are correct about PPPoE data frames? (Multiple Choice)

• A.The Session_ID segment of the ppp session must be the value specified in the Discovery phase and cannot be changed.
• B.After the PPPoE session is established, all Ethernet packets are unicast.
• C.The fixed value of the Ethernet Type field is Ox8863.
• D.When PPPoE is used to transfer session data, Code must be set to 0x0.

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