Regarding L2TP over IPSec VPN, which of the following statements is correct? (Multiple Choices)

• A.L2TP packets trigger IPSec SAs
• B.IPSec tunnel is established first
• C.IPSec packets trigger the L2TP tunnel
• D.L2TP tunnel is established first

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BFD static route topology is shown in Figure A.
On the firewall, administrator needs to do the following configuration:
[USG9000_A] bfd
[USG9000_A-bfd] quit
[USG9000_A] bfd aa bind peer-ip 1.1.1.2
[USG9000_A-bfd-session-aa] discriminator local 10
[USG9000_A-bfd-session-aa] discriminator remote 20
[USG9000_A-bfd-session-aa] commit
[USG9000_A-bfd-session-aa] quit
Which of the following section of the configuration is correct there? (Choose two answers)

• A.The command [U5G9000_A] bfd configuration errors, should be replaced by
  [U5G9000_A] bfd enable BFD function to enable
• B.firewall on BFD session will also need to bind with a static route command:
  [USG9000_A] ip route-static 0.0.0.0 0 1.1.1.2 track bfd-session aa
• C.[USG9000_A-bfd-session-aa] commit configuration is optional, if not configure the system will default to submit to configure and generate BFD session log information, but does not establish the session table
• D.The command "bfd as bind peer-ip 1.1.1.2" is used to create BFD sessions to detect link status binding policy

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Which part of the attack packet is matched by the blacklist to achieve attack prevention?

• A.destination port
• B.source port
• C.destination address
• D.source address

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DDos attacks work through the network to the target (usually a server, such as DNS server, WEB server) and sends a small amount of abnormal packets of non-traffic, so that the attacked server parses the message, causing the system to crash or become busy.

• A.TRUE
• B.FALSE

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When the performance difference between servers is large, which of the following algorithms can be used for load balancing?

• A.Simple polling algorithm
• B.Source IP hash algorithm
• C.The minimum connection algorithm
• D.Weighted polling algorithm

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