In the OSPF broadcast network, there are four routers in the same network segment, RTA, RTB, RTC, and RTD. The DR priorities are 2, 1, 1, and 0, and the Router IDs are 192.168.1.1, 192.168.2.1, 192.168. .3.1 and 192.168.4.1. If OSPF protocol is enabled on all the four routers, the BDR selected by OSPF is ________.

• A.RTA
• B.RTC
• C.RTB
• D.RTD

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When judging the old and new LSA, the serial number parameter and the age parameter will be used. Which of the following statements about the two parameters is correct?

• A.When the router receives two LSAs, the serial number is the same, the checksum is the same, and the smaller the age, the better.
• B.When the router receives an LSA age set to 360s, it means that the LSA is unavailable.
• C.Both the serial number and the age parameter can judge the LSA is old or new, and the router preferentially compares the sequence parameters, the bigger, the better.
• D.If the serial number of the LSA reaches the end value of 0x7FFF, the current router advertises the age of 3600s for lsa.

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The OSPFv3 Option field appears in all LSAs.

• A.False
• B.True

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The description of configuring BGP4+, which is correct? (Multiple choice)

• A.The BGP4+ router-ID is the same as the BGP4 router-ID.
• B.When BGP4+ configures a reflector, the roles of the reflector and the client must be consistent with the configuration of BGP4.
• C.The next hop of the BGP4+ route does not use the Link-Local address.
• D.BGP4+ does not support route reflectors.
• E.BGP4+ must use the Link-Local address when specifying the peer

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Regarding the sliding window of TCP, which of the following descriptions are wrong? (Multiple Choice)

• A.The sender announces the initial window size
• B.The sender does not need to transmit a complete window size message.
• C.After the retransmission timer expires, the sender has not received the acknowledgement and will retransmit the unconfirmed data.
• D.The sliding window size can only be increased or left unchanged
• E.TCP sliding window allows multiple packets to be sent before receiving an acknowledgment

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