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多选题
Although TCP segments differ from UDP segments, they both contain some common fields. What two segments do they share in common?（）
A
source address
B
options
C
sequence number
D
sources
E
destination port
F
checksum
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单选题You have 100 segments in the USERS tablespace. You realize that the USERS tablespace is running low on space. You can use Segment Advisor to（）.A
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单选题关于数据封装的顺序（）是正确的。A
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单选题An attacker sends a low rate of TCP SYN segments to hosts， hoping that at least one port replies. Which type of an attack does this scenario describe？（）A
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单选题You have 100 segments in the USERS tablespace. You realize that the USERS tablespace is running low on space. You can use Segment Advisor to（）。A
identify the segments that you should shrinkB
modify the storage parameters for the tablespaceC
automatically shrink the segments with unused spaceD
check the alerts generated for the tablespace that is running low on space
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多选题What statements are true regarding ICMP packets?（）AThey acknowledge receipt of TCP segments.BThey guarantee datagram delivery.CThey can provide hosts with information about network problems.DThey are encapsulated within IP datagrams.EThey are encapsulated within UDP datagrams.
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单选题Which of the following protocols use both TCP and UDP ports?（）A
FTPB
SMTPC
TelnetD
DNSE
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单选题How doTCP SYN attacks take advantage ofTCPto prevent new connections from being established to a host under attack？（）A
These attacks send multiple FIN segments forcing TCP connection release.B
These attacks fill up a hosts’ listen queue by failing to ACK partially openedTCPconnections.C
These attacks take advantage of the hosts transmit backoff algorithm by sending jam signals to the host.D
These attacks increment the ISN of each segment by a random number causing constant TCP retransmissions.E
These attacks send TCP RST segments in response toconnection SYN+ACK segments forcing SYN retransmissions.
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单选题You executed the following query： SELECT operation， undo_sql， table_name FROM flashback_transaction_query； Which statement is correct regarding the query output？（）A
It would return information regarding only the last committed transaction.B
It would return only the active transactions in all the undo segments in the database.C
It would return only the committed transactions in all the undo segments in the database.D
It would return both active and committed transactions in all the undo segments in the database.E
It would return information regarding the transactions that began and were committed in the last 30 minutes.
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多选题Although TCP segments differ from UDP segments, they both contain some common fields. What two segments do they share in common?（）Asource addressBoptionsCsequence numberDsourcesEdestination portFchecksum
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单选题To determine the space allocated for temporary segments, the DBA can access which of the following views? （）A
DBA_TABLESPACES B
DBA_TABLES C
DBA_SEGMENTS D
DBA_FREE_SPACE
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