网络工程师
单选题For (1) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (2) for every packet sent. Instead,when a connection is established, a route from the(3) machine to the d
题目
source
route
destination
host
相似问题和答案
第1题：
听力原文：M: Excuse me! I just need to send this letter the fastest way possible.
W: Let's see. We have overnight business service. That takes just two days.
Where does this conversation take place?
A．In a post office.
B．In a hotel.
C．In a bank
D．In a school.
解析：男士是要send a letter(寄信)，毫无疑问是在邮局。
第2题：
Let us hope we can settle the matter without ______ more trouble.
A. any
B. a little
C. some
D. little
without表示否定意义，所以需用any。
第3题：
What can we learn from the passage?
A. We should enjoy someone who hurts us.
B. We should pay more attention to our friends.
C. The peace of mind is more important than the hurt itself.
D. It’s better to let bitterness go along with the other person.
第4题：
A、after all
B、at any rate
C、all along
D、as a result
第5题：
We feel()with the inconvenience the service center brought us.
A. disappointed
B. worried
C. surprised
第6题：
If they are willing to lend us the money we need,all our problems will be__
A.solved
B.caused
C.covered
D.met
【考情点拨】考查动词词义辨析。 【应试指导】句意：如果他们愿意借给我们那笔我们需要的钱的话，我们的一切问题都将迎刃而解。solve problems为固定表达，意为“解决问题”。caused引起；covered覆盖；met遇到。
第7题：
For (71) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (72) for every packet sent. Instead, when a connection is established, a route from the (73)machine to the destination machine is chosen as part of the connection setup and stored in tables inside the (74) That route is used for all traffic flowing over the connection, exactly the same way that the telephone system works. When the connection is released, the virtual circuit is also terminated. With connection-oriented service, each packet carries an (75) telling which virtual circuit it belongs to.
A．connectionless
B．connection-oriented
C．datagram
D．telegram
第8题：
● For （71） service, we need a virtual-circuit subnet. Let us see how that works. The
idea behind virtual circuits is to avoid having to choose a new （72） for every packet sent.
Instead, when a connection is established, a route from the （73） machine to the destination
machine is chosen as part of the connection setup and stored in tables inside the （74） . That
route is used for all traffic flowing over the connection, exactly the same way that the
telephone system works. When the connection is released, the virtual circuit is also
terminated. With connection-oriented service, each packet carries an （75） telling which
virtual circuit it belongs to.
（71）A. connectionless B. connection-oriented C. datagram D. telegram
（72）A. processor B. device C. route D. terminal
（73）A. source B. route C. destination D. host
（74）A. connections B. resources C. bridges D. routers
（75）A. address B. identifier C. interface D. element
答案：B、C、A、D、B
翻译：
实现面向连接的服务需要一个虚电路子网，下面看它如何工作。虚电路的主要思想
是避免为每一个发送的分组都进行重新的路由选择。事实上，在连接建立过程中，从
源主机到目标主机的路自己经选定，并存储在略由器内部的路由表中。连接上的所有通
信都使用这个路由，与电话系统的工作方式完全一样。当连接释放时，虚电路也终止。
在面向连接的服务中，每一个分组都含有一个标识符，用于表示该分组所属的虚电路号。
第9题：
Dear Mr Davis,
We are glad to (1)()you that 100 cases of hand drills you shipped to Sydney on 1st July have arrived in (2)()condition. It shows that you have made great (3)()in packing.
As for the hand drills to be shipped to us, we would like you to have them packed in boxes of 2 dozen each, 50 boxes to a (4)()case. We are certain that you will give special care to the packing in order to avoid any damage in the process of (5)().
Please let us know by cable if you can meet our requirements.
Regards,
Emily McPhee
Sales Director
第10题：
We need more food to protect us ________ the famine.
A. out
B. off
C. to
D. against