Which of the following statements about the BSR mechanism are true? (Multiple Choice)

• A.A C-BSR can also collect C-RP information by using C-RP packets.
• B.A PIM-SM domain can have multiple C-BSRs, but only one elected BSR.
• C.An elected BSR floods Bootstrap packets to advertise BSR information and C-RP information to all routers in a PIM-SM domain.
• D.An elected BSR can collect C-RP information by using the C-RP packets received.

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A number of transition techniques have emerged in the process of replacing an IPV4 address used in a network with an IPv6 address. These technologies are divided into two categories: one is IPV4/IPv6 coexistence technology, and the other is IPV4/IPV6 interworking technology. Which of the following options belong to IPV4/IPV6 coexistence technology? (Multiple choice)

• A.IPv6 over IPv4
• B.Dual-stack
• C.NAT64
• D.SATAP

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Two EBGP neighbors connected by two parallel cables. What method will you use to achieve bidirectional load sharing between two EBGP neighbors connected through these two parallel serial cables?

• A.Configure the EBGP neighbor relationship with the loopback interface as the update source. The IGP in each AS must have two equal-cost paths to the EBGP neighbor loopback address. You need to use the command "next-hop-local".
• B.Without any method, BGP automatically implements load sharing between different autonomous systems on the available links.
• C.Configure the loopback interface to establish an EBGP neighbor relationship and configure EBGP Multi-hop. Configure the loopback interface as the update source, and then use IGP to implement equal-cost path load sharing between addresses.
• D.Configure the EBGP neighbor relationship with the loopback interface as the update source. The IGP in each AS needs to import two equal-cost paths to the EBGP neighbor loopback address. You need to use the commands ebgp-max-hop and next- Hop-local
• E.Use the command at both ends "ebgp-load-balance

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Which of the following belong to single package attack? (Multiple Choice)

• A.Malformed package attack
• B.Special control package attack
• C.Scanning detection attack
• D.DDoS attack

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Which of the following statement about the digital certificate is wrong?

• A.The digital certificate contains public key information.
• B.Even if the two PRI entities are not in the same CA system, the two parties can complete the authentication as long as they can identify each other.
• C.Digital signatures guarantee the integrity of digital certificates.
• D.When the received peer certificate is valid, but the device itself is in the wrong time and is not within the validity period of the certificate, the authentication fails.

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