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Which two statements about SCSI are true？ （）
A . The bus is limited to 32 devices
B . It is a full duplex serial standard
C . It is a half-duplex serial standard
D . It allows up to 320 MB/s of shared channel bandwidth
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Which two statements about zoning are correct? （）
A . Zoning increases security.
B . DNS queries are used for software zoning.
C . Software zoning is more secure than hardware zoning.
D . When using zones and VSANs together, the zone is created first.
E . Zoning requires that VSANs be established before it becomes operational.
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Which two statements about subqueries are true? （）
A . A single row subquery can retrieve data from only one table.
B . A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.
C . A SQL query statement can display data from table B that is referred to in its subquery, without including table B in its own FROM clause.
D . A single row subquery can retrieve data from more than one table.
E . A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.
F . A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.
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Which two statements are true regarding views?（）
A . A subquery that defines a view cannot include the GROUP BY clause
B . A view that is created with the subquery having the DISTINCT keyword can be updated
C . A view that is created with the subquery having the pseudo column ROWNUM keyword cannot be updated
D . A data manipulation language (DML) operation can be performed on a view that is created with the subquery having all the NOT NULL columns of a table
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Which two statements about WRED are true？ （）
A . WRED can selectively discard lower priority traffic when the interface becomes congested and can provide differentiated performance characteristics for different classes of service.
B . Resource Reservation Protocol （RSVP） and WRED cannot be configured on the same interface.
C . WRED will throttle back voice traffic only as a last resort.
D . If the average queue length is greater than the minimum threshold but less than the maximum threshold， then based on the drop probability， WRED will either queue the packet or perform a random drop.
E . WRED statistically drops more packets from low-bandwidth users than high-bandwidth users. Therefore， traffic sources that generate the least traffic are more likely to be slowed down than traffic sources that generate the most traffic.
F . WRED treats non-IP traffic as precedence 4.
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Which two statements are true about alerts（）
A . Clearing an alert sends the alert to the alert history.
B . Response actions cannot be specified with server-generated alerts.
C . The nonthreshold alerts appear in the DBA_OUTSTANDING_ALERTS view.
D . Server-generated alerts notify the problems that cannot be resolved automatically and requireadministrators to be notified.
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Which two statements are true if a NullPointerException is thrown on line 3 of class C？（）https://assets.asklib.com/images/image2/2018080115102280471.jpg
A . The application will crash.
B . The code on line 29 will be executed.
C . The code on line 5 of class A will execute.
D . The code on line 5 of class B will execute.
E . The exception will be propagated back to line 27.
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Which two statements are true about checkpointing（）
A . The checkpoint frequency decreases with the smaller redo log file size.
B . It ensures that all committed data is written to the data files during normal shutdown.
C . The frequent full checkpoint in a database can cause the overall degradation of the database performance.
D . It prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the online redo log files.
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Which two statements are true regarding listeners（）
A . Listeners use only the TCP/IP protocol.
B . Multiple listener processes can run simultaneously on a host.
C . Multiple database instances can be registered with a single listener.
D . The listener-related errors can be traced only at the administrative level.
E . Only one database instance can be registered with a single listener at any time.
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Which two statements are true about constraints? （）
A . The UNIQUE constraint does not permit a null value for the column.
B . A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.
C . The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index.
D . The NOT NULL constraint ensures that null values are not permitted for the column.
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Which two statements about zoning are correct？（）
A . Zoning increases security.
B . DNS queries are used for software zoning.
C . Software zoning is more secure than hardware zoning.
D . When using zones and VSANs together， the zone is created first.
E . Zoning requires that VSANs be established before it becomes operational.
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Which two statements about sequences are true? （）
A . You use a NEXTVAL pseudo column to look at the next possible value that would be generated from a sequence, without actually retrieving the value.
B . You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence.
C . You use a NEXTVAL pseudo column to obtain the next possible value from a sequence by actually retrieving the value from the sequence.
D . You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column.
E . If a sequence starting from a value 100 and incremented by 1 is used by more then one application, then all of these applications could have a value of 105 assigned to their column whose value is being generated by the sequence.
F . You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence.
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Which two statements are true？（）
A . It is possible for more than two threads to deadlock at once.
B . The JVM implementation guarantees that multiple threads cannot enter into a deadlocked state.
C . Deadlocked threads release once their sleep（） method’s sleep duration has expired.
D . Deadlocking can occur only when the wait（）， notify（）， and notifyAll（） methods are used incorrectly.
E . It is possible for a single-threaded application to deadlock if synchronized blocks are used incorrectly.
F . If a piece of code is capable of deadlocking， you cannot eliminate the possibility ofdeadlocking by insertinginvocations of Thread.yield（）.
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Which two WLAN implementation statements are true？（）
A . An autonomous wireless solution includes lightweight APs and WLAN controllers. The APs and the WLAN controllers are managed by a WLAN solution engine （WLSE/WLSM）.
B . An autonomous wireless solution includes lightweight APs and WLAN controllers. The APs and the WLAN controllers are managed by the Cisco Wireless Control System （WCS）.
C . A lightweight wireless solution includes lightweight APs and WLAN controllers. The APs and the WLAN controllers are managed by a WLAN solution engine （WLSE/WLSM）.
D . A lightweight wireless solution consists of autonomous access points （APs）， which are managed by a WLAN solution engine （WLSE/WLSM）.
E . A lightweight wireless solution includes lightweight APs and WLAN controllers. The APs and the WLAN controllers are managed by the Cisco Wireless Control System （WCS）.
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Which two wireless security statements are true？（）
A . A TACACS+ server is required to implement 802.1x.
B . MIC protects against man-in-the-middle and replay attacks.
C . The 802.1x standard provides encryption services for wireless clients.
D . The AES （symmetric block cipher） is specified in the IEEE 802.11i specification.
E . The IEEE 802.11i specification uses RC4 as its encryption mechanism.
F . WPA requires TKIP and AES as encryption methods.
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Which two statements are true regarding EIGRP？（）
A . Passive routes are in the process of being calculated by DUAL.
B . EIGRP supports VLSM，route summarization，and routing update authentication.
C . EIGRP exchanges full routing table information with neighboring routers with every update.
D . If the feasible successor has a higher advertised distance than the successor route，it becomes theprimary route.
E . A query process is used to discover a replacement for a failed route if a feasible successor is not identified from the current routing information.
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Which two multicast protocol statements are true？ （Choose two.） （）
A . Dense mode multicast requires explicit join messages from their members.
B . Dense mode multicast uses a push model to flood traffic throughout the network and then prunes the unwanted traffic.
C . Sparse mode multicast uses a pull model to send multicast traffic to where it is requested.
D . Sparse mode uses reverse path forwarding （RPF） to prune off redundant flows.
E . The primary use of sparse mode multicast is for test labs and router performance testing.
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Which two statements are true regarding subqueries? （）
A . A subquery can retrieve zero or more rows
B . Only two subqueries can be placed atone level
C . A subquery can be used only in SQL query statements
D . A subquery can appear on either side of a comparison operator
E . There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement&e
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Given that b and c refer to instances of wrapper classes， which two statements are true？（）
A . b.equals（b） returns true.
B . b.equals（c） returns the same result as b == c.
C . b.eqials（c） can return false even if c.equals（b） returns true.
D . b.equals（c） throws an exception if b and c are different wrapper types.
E . b.equals（c） returns false if the type of wrapper objects being compared are different.
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Which two statements are true?（）
A . It is possible for more than two threads to deadlock at once.
B . The JVM implementation guarantees that multiple threads cannot enter into a deadlocked state.
C . Deadlocked threads release once their sleep() method's sleep duration has expired.
D . Deadlocking can occur only when the wait(), notify(), and notifyAll() methods are used incorrectly.
E . It is possible for a single-threaded application to deadlock if synchronized blocks are used incorrectly.
F . If a piece of code is capable of deadlocking, you cannot eliminate the possibility of deadlocking by inserting invocations of Thread.yield().
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Which two of statements are true？（）
A . It is possible to synchronize static methods.
B . When a thread has yielded as a result of yield（）， it releases its locks.
C . When a thread is sleeping as a result of sleep（）， it releases its locks.
D . The Object.wait（） method can be invoked only from a synchronized context.
E . The Thread.sleep（） method can be invoked only from a synchronized context.
F . When the thread scheduler receives a notify（） request， and notifies a thread， that thread immediately releases its lock.
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Which two statements are correct? Choose two answers.
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Click the Exhibit button. Given:Which two statements are true if a NullPointerException is thrown on line 3 of class C？ （）
<img src='https://img2.soutiyun.com/ask/uploadfile/2019-03-27/900591de4611848eaa661230b23f7c01.jpg' />
<img src='https://img2.soutiyun.com/ask/uploadfile/2019-03-27/096a8f1a86972212e5c4d4c53f88ec71.jpg' />
A.The application will crash.
B.The code on line 29 will be executed.
C.The code on line 5 of class A will execute.
D.The code on line 5 of class B will execute.
E.The exception will be propagated back to line 27.
