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

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Which of the following are the techniques for improving MPLS BGP VPN reliability? (Multiple choice)

• A.Configure CE dual-homing networking on the access layer.
• B.Private network IP routing FRR between the PE and CE
• C.VPN FRR
• D.VPN GR

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The following statement about cross-domain MPLS VPN, which is the wrong description?

• A.For the cross-domain vPN-OptionB mode, two ASBR are interconnected by multiple interfaces (including sub-interfaces). Each interface is associated with one VPN. Each ASBR-PE uses the peer as the CE.
• B.For the cross-domain vPn-OptionA mode, the route between the two ASBR is a common IPv4 route.
• C.When the public network label is only LDP, the cross-domain vp-Option-c scheme 2 needs to use three-layer labels in the packet forwarding process.
• D.For the cross-domain vPN-OptionB mode, an MP-eBGP neighbor relationship needs to be established between the two ASBR.

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The LAND attack is performed by the attacker sending a source address and a destination address to the destination host as the destination host. The source port and the destination port are the same SYN packet. When the receiver waits for the final ACK packet from the sender, the connection is always in a semi-connected state, resulting in waste of limited TCP resources at the receiving end.

• A.True
• B.False

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Regarding Route Policy, which of the following descriptions are correct? (Multiple Choice)

• A.The entry permit::0 less-equal 128 indicates that all IPv6 routes are allowed to pass.
• B.An advanced ACL can be applied to the route-policy to filter routes.
• C.If more than one node is defined in the Route-policy, at least one of the nodes should have a matching mode of permit.
• D.Route-Policy can only filter the default route.

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