As shown in the following picture, which of the following description is correct?

• A.R1 exist LSDB of Level-1 and Level-2 at the same time
• B.R1 has a route to R2 1oopback0 10.0.2.2/32
• C.R1 may Ping through R21 1oopbapk0 interface address
• D.No neighbor relationship can be established between R1 and R2.

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Regular expressions can be used in Community-filter and AS-path-filter to define attribute types for route filtering.

• A.True
• B.False

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The configurations of the defined route-policy test are as follows:
ip community-filter 1 permit 100:1
ip as-path-filter 2 permit ^100$
route-policy test permit node 10
if-match community-filter 1
if-match AS-path-filter 2
apply as-path 200
Which of the following statements is true?

• A.The BGP routes will match the route-policy test only when they contain both community attribute 100:1 and as-path 100. The as-path of the matched routes is then changed to 200.
• B.The BGP routes will match the route-policy test only when they contain either community attribute 100:1 or as-path 100. The as-path of the matched routes is then changed to 200.
• C.The BGP routes will match the route-policy test as long as they contain community attribute 100:1. The as-path of the matched routes is then changed to 200.
• D.The BGP routes will match the route-policy test only when they contain as-path 100. The as-path of the matched routes is then changed to 200.

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About the description of the process of sending and receiving data frames in the Access mode of the switch interface, which is correct?

• A.In the Access mode, the VLAN tag of the data frame will be stripped off when sent.
• B.Directly discards when receiving a tagged data frame in Access mode
• C.When the data frame enters the switch interface, the switch learns the destination MAC address in the data frame.
• D.Only receive unlabeled data frames in Access mode

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In RSTP, which port can provide the backup path that has reached to the root node of the spanning tree? What state is the port?

• A.Alternate port and Forwarding state
• B.Alternate port and Discarding state
• C.Designate port and Listening state
• D.Alternate port and Learning state
• E.Root port and Listening state

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