To display the routing table of router R1, the "display ip routing-table" command was issued. Router R1 is running OSPF.
Which one of the following statements is true regarding the OSPF information in a routing table?

• A.Routes that are within an area (intra-area) are marked with an “O_IA” in the routing table.
• B.A route that has been imported into OSPF can only be represented with an “O_ASE” designation.
• C.Type-7 LSAs display routes are imported into OSPF from another process, and are indicated by an "OSPF" marking.
• D.A routing designated with only an “O_ASE" represents either a type-1 or type-2 LSA.
• E.All LSA types have unique designations in the IP routing table.

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The HTTP protocol is based on TCP. Therefore, you can use the TCP Flood attack defense method to defend against HTTP flood attacks.

• A.True
• B.False

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The following topology is available, which of the following statement is correct based on analysis?

• A.There are routing entries of 10.0.2.2/32 and 10.0.0.0/16 in the IP routing table of R1.
• B.There are routing entries for 10.0.2.2/32 and 10.0.3.3/32 in the IP routing table of R1.
• C.Because R2 does route aggregation, only the routing entry of 10.0.0.0/16 exists in the IP routing table of R1.
• D.The routing entries of 10.3.3.3/32 and 10.0.0.0/16 exist in the IP routing table of R1 at the same time.

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During the process in which IS-IS establishes a neighbor relationship, IS-IS does not send CSNP packets on a P2P network.

• A.False
• B.True

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Command ip ip-prefix ip-prefix-name [index index-number] { permit | deny} ipv4-address mask-length [greater-equal greater-equal-value ] less-equal less-equal-value]Hf-IP- Prefix-filter.
If the less-equal of a prefix list has been specified, but the greater-equal is not specified, what is the range of the prefix?

• A.[less-equal-value, 32
• B.No restrictions
• C.[0,less-equal-value
• D.mask-length, less-equal-value

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