[单项选择]Transport gateways connect byte streams in the transport layer. Application gateways allow interworking above
A. network layer
B. data link layer
C. transport layer
D. application layer

[单项选择]Transport gateways connect byte streams in the transport layer. Application gateways allow interworking above
A. network layer
B. data link layer
C. transport layer
D. application layer

[单项选择]给出下面程序的代码： byte[ ] array1， array2[ ]； byte array3[ ][ ]； byter[ ][ ] array4； 下列数组操作语句中不正确的是( )。
A. array2=array1
B. array2=array3；
C. array2=array4
D. array3=array4

[单项选择]The passage suggests that when jet streams interact with continents with few mountain ranges and plains, which of the following also happens
A. (A) More "wandering" occurs in the jet stream than would probably occur over the ocean.
B. (B) The continent in question heats and cools at a faster rate than it would without the jet stream.
C. (C) The jet stream becomes more narrow and focused than it would be over the ocean.
D. (D) The temperature of the jet stream is distributed more evenly than if the continent had more mountains.
E. (E) The jet stream evinces more signs of being a thermally driven phenomenon than it does in other situations.

[单项选择] byte arry1， array2；   byte array3 ；   byte array4；   If each array has been initialized， which statement will cause a compiler error？（）
A.  Array2 = array1；
B.  Array2 = array3；
C.  Array2 = array4；
D.  Both A and B
E.  Both A and C
F.  Both B and C

[单项选择]International trade is different from domestic trade, please point out which of the following descriptions is not right( )
A. International trade is more costly
B. International trade is less costly
C. International trade is restricted to trade in goods and services
D. International trade is also a branch of economics

[单项选择]

Psychologists still wonder if some personality traits are inborn.（）

A. interminable
B. inadvertent
C. innate
D. inevitable

[单项选择]Which statement is correct regarding exception traffic processing?（）
A. Exception traffic is only handled by the PFE
B. Exception traffic is rate-limited across the internal link to protect the RE
C. Exception traffic is not prioritized during times of congestion
D. Exception traffic is forwarded based on forwarding table entries

[单项选择]Which CLI command displays packet and byte counts for an interface in real-time?（）
A. monitor traffic
B. show interfaces
C. monitor interface
D. show traffic counts

[单项选择]给定下面的代码： byte[] array1,array2[]; byte array3[] []; byte [] [] array4; 如果上面的每一个数组都初始化了，以下各项语句中错误的是( )。
A. array2 =array1
B. array2=array3
C. array2=array4
D. both A and B

[单项选择]给定下面的代码： byte[] arrayl,array2[]; byte array3[][]; byte [][] array4; 如果上面的每一个数组都初始化了，以下各项语句中错误的是( )。
A. array2=array1
B. array2=array3
C. array2=array4
D. both A and B

[单项选择] A network administrator wants to permit Telnet traffic initiated from the address book entry the10net in a zone called UNTRUST to the address book entry Server in a zone called TRUST. However, the administrator does not want the server to be able to initiate any type of traffic from the TRUST zone to the UNTRUST zone. Which configuration statement would correctly accomplish this task?（）
A. from-zone UNTRUST to-zone TRUST { policy DenyServer { match { source-address any; destination-address any; application any; } then { deny; } } } from-zone TRUST to-zone UNTRUST { policy AllowTelnetin { match { source-address the10net; destination-address Server; application junos-telnet; } then { permit; } } }
B. from-zone TRUST to-zone UNTRUST { policy DenyServer { match { source-address Server; destination-address any; application any; } then {deny; } } } from-zone UNTRUST to-zone TRUST { policy AllowTelnetin { match { source-address the10net; destination-address Server; application junos-telnet; } then { permit; } } }
C. from-zone UNTRUST to-zone TRUST { policy AllowTelnetin { match { source-address the10net; destination-address Server; application junos-ftp; } then { permit; } } }
D. from-zone TRUST to-zone UNTRUST { policy DenyServer { match { source-address Server; destination-address any; application any; } then { permit; } } } from-zone UNTRUST to-zone TRUST { policy AllowTelnetin { match {source-address the10net; destination-address Server; application junos-telnet; } then { permit; } } }

[单项选择]Great Salt Lake is fed by fresh-water streams, _________ is about four to five times as salty as the ocean.
A. yet
B. which
C. there
D. despite

[单项选择]Ocean exploration is not so expensive as space travel mainly because _________.

[单项选择]The theoretical separation of living, working, traffic and recreation has led to ______.
A. the disproportion of recreation facilities in the neighborhood
B. the location of recreation facilities far from home
C. relatively little attention for recreative possibilities
D. the improvement of recreative possibilities in the neighborhood

[单项选择]The tenants were asked to throw all recyclable trash into ______.
A. the big green plastic bag
B. the green big plastic bag
C. the big plastic green bag
D. the green plastic big bag

[单项选择]Tile rivers and streams of the Amazon basin teem with life, and the forest canopy resonates with the cries of birds and monkeys and the whines of insects.
A. converges
B. echoes
C. overwhelms
D. responds

[填空题]ATM异步传送模式信元的长度固定为53个byte，其中前（）个byte是信头（header），其余（）个byte是信息段，也称为净荷（payload）。