Which four statements 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 .  Error B .  Event C .  Object D .  Exception E .  Throwable F .  Runtime Exceptio

A .  Error B .  Event C .  Object D .  Exception E .  Throwable F .  RuntimeExceptio

A . access-list 10 permit 172.29.16.0 0.0.0.255 B . access-list 10 permit 172.29.16.0 0.0.1.255 C . access-list 10 permit 172.29.16.0 0.0.3.255 D . access-list 10 permit 172.29.16.0 0.0.15.255 E . access-list 10 permit 172.29.0.0 0.0.255.255

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. G .  The relationship between Movie and Actress is an example of an is-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 . string B . character C . integer D . calendar E . numeric F . translation G . date H . conversio

A .  Error B .  Event C .  Object D .  Throwable E .  Exception F .  RuntimeExceptio

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 . At zero load the intake manifold pressure is greater than the exhaust manifold pressure B . At full load the intake manifold pressure and exhaust manifold pressure are equal C . At full load the intake manifold pressure is less than the exhaust manifold pressure D . At full load the intake manifold pressure is greater than the exhaust manifold pressure

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 .  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 . 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 . A PVC bundle will not come up unless all the precedence， DSCP， and EXP levels are configured in thebundle. B . A PVC bundle can perform precedence and DSCP matching at the same time C . A PVC bundle may contain no more than sixteen PVCs D . A PVC can be in only one PVC bundle E . A PVC bundle cannot perform precedence and DSCP matching at the same time. F . A PVC bundle may contain no more than eight PVCs.

A．In American culture friendship means a strong life-long bond between two peopl E．Friendships develop slowly, since they are built to last. B．I n C hina there are few limits on what you can ask or expect of a frien D．You can feel free to tell your friend what he or she can or should do to help you. C．In China,friendships are based on common interests. When the shared activity ends, the friendship may fade D．Americans expect their friends to be independent , so they do not feel comfortable in a relationship in which one person is giving more and the other person is dependent on what is being given. 此题为多项选择题。