Which four 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.

A . EVC infrastructure is a Layer 3 platform-independent routing architecture that supports IP overEthernet services B . Ethernet flow point （EFP） is configured on the main interface C . Feature commands like MQC-based QoS policies can be specified D . EVC infrastructure is a Layer 2 platform-independent bridging architecture that supports Ethernetservices E . Each Ethernet flow point （EFP） matches a predefined VLAN tag-based criteria F . Ethernet flow point （EFP） is configured on the VLAN interface

A . Label B . VPI VCI C . EXP D . TTL E . FCS F . S flag

A . You cannot roll back this statement. B . All pending transactions are committed. C . All views based on the DEPT table are deleted. D . All indexes based on the DEPT table are dropped. E . All data in the table is deleted, and the table structure is also deleted. F . All data in the table is deleted, but the structure of the table is retained. G . All synonyms based on the DEPT table are deleted.

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.

A . CASCADE B . UNIQUE C . NONUNIQUE D . CHECK E . PRIMARY KEY F . CONSTANT G . NOT NULL

A . Raccoon is-a Mammal. B . Raccoon has-a Mammal. C . BabyRaccoon is-a Mammal. D . BabyRaccoon is-a Raccoon. E . BabyRaccoon has-a Mammal. F . BabyRaccoon is-a BabyRaccoon.

A . Automatically versions all tables. B . Automatically installed with Oracle9i. C . Merges changes with parent rows or discard changes. D . Provides mechanism to identify and resolve conflicts. E . Allows for version enabling tables by use of a packages procedure.

A . string B . character C . integer D . calendar E . numeric F . translation G . date H . conversio

A . Must begin with either a number or a letter. B . Must be 1-30 characters long. C . Should not be an Oracle Server reserved word. D . Must contain only A-Z, a-z, 0-+, _, *, and #. E . Must contain only A-Z, a-z, 0-9, _, $, and #. F . Must begin with a letter.

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.

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（）.

A . Creating and dropping tables in the data file being moved B . Performing file shrink of the data file being moved C . Querying tables in the data file being moved D . Performing Block Media Recovery for a data block in the data file being moved E . Flashing back the database F . Executing DML statements on objects stored in the data file being moved

A . cannot be nested B . manipulate data items C . act on each row returned D . return one result per row E . accept only one argument and return only one value F . accept arguments which can be a column or an expressio

A . SLA responder knows type of operation， the port used， and duration. B . SLA responder inserts in and out timestamps in the packet payload. C . SLA sender and responder use the IP SLA Control Protocol to communicate with each other before D . SLA sender and responder communication can be encrypted. E . SLA sender and responder communication can be authenticated with MD5.

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.

A .  Database Service B .  Data Service C .  Java Service D .  Security Service E .  .NET Service F .  SOA Service

A . MPLS is required between the PE and CE routers that connect the backbone carrier to the customer carrier. B . The backbone carrier must enable the PE router to check that the packets it receives from the CErouter contain only the labels that the PE router advertised to the CE router. C . Every packet that crosses the backbone carrier must be encapsulated so that the packet includes MPLS labels D . AII PE routers that link the backbone carrier to the customer carrier must run Route Target Rewrite. E . Arouting protocol is required between the PE and CE routers that connect the backbone carrierto thecustomer carrier. The routing protocol enables the customer carrier to exchange IGP routing information with the backbone carrier.

A . Packets to the IP address 10.10.10.5/32 will be tagged with "17" toward the next hop. B . Label "19" will be advertised to MPLS neighbors so that they can use this label to reach the IP address 10.10.10.6/32. C . IP address 10.10.10.4/32 is directly connected to the neighbor router on serial 3/0. D . Packets arriving with label "17" will be forwarded without any label toward serial 4/0. E . Packets arriving with label "20" will be forwarded with label "21" after label-swapping. F . Label "20" is advertised to MPLS neighbors so that they can use this information to reach the prefix 10.10.10.8/32.

A . Raccoon is-a Mammal. B . Raccoon has-a Mammal. C . BabyRaccoon is-a Mammal. D . BabyRaccoon is-a Raccoon. E . BabyRaccoon has-a Mammal. F . BabyRaccoon is-a BabyRaccoon.

A . INSTR returns the numeric position of a named character. B . NVL2 returns the first non-null expression in the expression list. C . TRUNCATE rounds the column, expression, or value to n decimal places. D . DECODE translates an expression after comparing it to each search value. E . TRIM trims the heading or trailing characters (or both) from a character string. F . NVL compares two expressions and returns null if they are equal, or the first expression if they are not equal. G . NULLIF compares two expressions and returns null if they are equal, or the first expression if they are not equal.

A . video B . intercompany communications C . covergence protocols D . dedicated networking E . clod computing F . enterprise social networking G . interoperability