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Which of the following statements are true？（）
A . The equals（） method determines if reference values refer to the same object.
B . The == operator determines if the contents and type of two separate objects match.
C . The equals（） method returns true only when the contents of two objects match.
D . The class File overrides equals（） to return true if the contents and type of two separate objects match.
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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 four statements about NetFlow are true？（）
A . NetFlow records bidirectional IP traffic flow.
B . NetFlow export can be implemented over IPv4.
C . NetFlow export can be implemented over IPv6.
D . NetFlow records multicast IP traffic flow.
E . NetFlow records ingress traffic.
F . NetFlow records egress traffic.
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Which three statements are true about policing？（）
A . Out-of-profile packets are queued.
B . It causes TCP retransmits.
C . Marking and remarking are not supported.
D . It does not respond to BECN and foresight messages.
E . It uses a single- and two-bucket mechanism for metering.
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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 three statements about RSTP are true？（）
A . RSTP significantly reduces topology reconverging time after a link failure.
B . RSTP expends the STP port roles by adding the alternate and backup roles.
C . RSTP port states are blocking，discarding，learing，or forwarding.
D . RSTP also uses the STP proprsal-agreement sequence.
E . RSTP use the same timer-baseed process as STP on point-to-point links.
F . RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
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Which statements are true regarding ISDN channels?（）
A . Each B channel can transmit up to 64 kbps
B . The ISDN B channel carries voice or data
C . The ISDN D channel transmits control information.
D . The D channel transmission rate varies depending on the service used.
E . HDLC or PPP can be used to encapsulate D channel information.
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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 four statements are true？（）
A . Has-a relationships should never be encapsulated.
B . Has-a relationships should be implemented using inheritance.
C . Has-a relationships can be implemented using instance variables.
D . Is-a relationships can be implemented using the extends keyword.
E . Is-a relationships can be implemented using the implements keyword.
F . An array or a collection can be used to implement a one-to-many has-a relationship.
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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 three statements about subqueries are true? （）
A . Asinglerowsubquerycanretrieveonlyonecolumnandonerow.
B . Asinglerowsubquerycanretrieveonlyonerowbutmanycolumns.
C . Amultiplerowsubquerycanretrievemultiplerowsandmultiplecolumns.
D . Amultiplerowsubquerycanbecomparedusingthe"；>；"；operator.
E . AsinglerowsubquerycanusetheINoperator.
F . Amultiplerowsubquerycanusethe"；="；operator.
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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 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 three statements are true?（）
A . A final method in class X can be abstract if and only if X is abstract.
B . A protected method in class X can be overridden by any subclass of X.
C . A private static method can be called only within other static methods in class X.
D . A non-static public final method in class X can be overridden in any subclass of X.
E . A public static method in class X can be called by a subclass of X without explicitly referencing the class X.
F . A method with the same signature as a private final method in class X can be implemented in a subclass of X.
G . A protected method in class X can be overridden by a subclass of X only if the subclass is in the same package as X.
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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 three statements are true？（）
A . The default constructor initializes method variables.
B . The default constructor has the same access as its class.
C . The default constructor invoked the no-arg constructor of the superclass.
D . If a class lacks a no-arg constructor， the compiler always creates a default constructor.
E . The compiler creates a default constructor only when there are no other constructors for the class.
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Which statements about inheritance are true？（）
A . In Java programming language only allows single inheritance.
B . In Java programming language allows a class to implement only one interface.
C . In Java programming language a class cannot extend a class and implement a interface together.
D . In Java programming language single inheritance makes code more reliable.
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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 three MPLS statements are true？（）
A . Cisco Express Forwarding （CEF） must be enabled as a prerequisite to running MPLS on a Cisco router.
B . Frame-mode MPLS inserts a 32-bit label between the Layer 3 and Layer 4 headers.
C . MPLS is designed for use with frame-based Layer 2 encapsulation protocols such as Frame Relay， but is not supported by ATM because of ATM fixed-length cells.
D . OSPF， EIGRP， IS-IS， RIP， and BGP can be used in the control plane.
E . The control plane is responsible for forwarding packets.
F . The two major components of MPLS include the control plane and the data plane.
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Which statements are true concerning NAT？ （）
A . NAT provides 1 to manyaddress mapping.
B . NAT provides 1 to 1 address mapping.
C . NAT is only useful forTCP/UDP and ICMP traffic.
D . NAT can be used for all IP traffic.
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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.
