Which of the following descriptions about the Originator_ID attribute in BGP is correct? (Multiple choice)

• A.If there are multiple RRs in As, the Originator_ID attribute is created by the first RR
• B.When a route is reflected by RR for the first time, RR adds the Originator_ID attribute to this route to identify the originating router of this route
• C.Originator_ID is a recognized arbitrary attribute
• D.When other BGP Speakers receive this route, they will compare the received Originator_ID with the local RouterID. If the two IDs are the same, BGPSpeaker will ignore this route and do not process it.

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Depending on the type of algorithms used, routing protocols are classified into distance-vector protocols and link-state protocols.
Which of the following routing protocols are link-state protocols?

• A.RIP
• B.OSPF
• C.IS-IS
• D.BGP

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On an OSPF network, one router with P2P as the network type is directly connected to another router with P2MP as the network type. If the Hello intervals on the two routers are changed to be the same, neighbor relationship establishment and LSDB synchronization are not affected.

• A.TRUE
• B.FALSE

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OSPF has five types of packets, which have the same header format. If the Auth Type field in the packet header is 1, which of the following authentication modes is used?

• A.Non-authentication
• B.MD5 authentication
• C.Plaintext authentication
• D.Hash authentication

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Which of the following statements regarding DR/BDR are false?

• A.In a broadcast network, DR and BDR must be elected. A broadcast network without a DR or BDR cannot operate normally.
• B.DR others listen on the multicast address 224.0.0.5.
• C.All DR others establish neighbor relationships with DR and BDR only.
• D.DR others listen on the network address 224.0.0.6.

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