题目内容
（请给出正确答案）
Which of the following are layer 1 devices that you can use？ (Choose all that apply.)
A．A switch
B．A router
C．A network adapter card
D．A hub
E．A repeater
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更多“The LAN needs are expanding at…”相关的问题
Question 7: Can you tell me what the difference of two SQL statements at
performance of execution？
Statement 1:
if NOT EXISTS (select * from publishers where state = 'NY')
begin
SELECT 'Sales force needs to penetrate New York market'end
else
begin
SELECT 'We have publishers in New York'
end
Statement 2:
if EXISTS (select * from publishers where state = 'NY')
begin
SELECT 'We have publishers in New York'
end
else
begin
SELECT 'Sales force needs to penetrate New York market'
end
A．Allowing simultaneous frame. transmissions
B．Increasing the size of broadcast domains
C．Increasing the maximum length of UTP cabling between devices
D．Filtering frames based on MAC addresses
E．Decreasing the number of collision domains
A．same
B．similar
C．different
D．difference
A brouter is a network bridge and a router combined in a single product. A bridge is a device that connects one local area network (LAN) to(1)local area network that uses the same protocol (for example,(2)or Token Ring). If a data unit on one LAN is intended for a(3)on an interconnected LAN, the bridge forwards the data unit to that LAN; otherwise, it passes it along on the same(4). A bridge usually offers only one path to a given interconnected LAN. A router connects a network to one or more other(5)that are usually part of a wide area network (WAN) and may(6)a number of paths out to destinations on those networks. A router therefore needs to have(7)information than a bridge about the interconnected networks. It(8)a routing table for this information. Since a given outgoing data unit or packet from a computer may be intended for an(9)on the local network, on an interconneted LAN, or the wide area network, it makes sense to have a single unit that(10)all data units and forwards them appropriately.
供选择的答案：
1．more 2．LAN 3．Ethernet 4．address 5． offer
6．destination 7．consults 8．another 9．networks 10．examines
●Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous systems. Typically, each department or division has defined its own network needs (70) OS, LAN topology, communication protocols, applications, and other components.
(66) A．same
B．similar
C．different
D．difference
(67) A．same
B．similar
C．different
D．difference
(68) A．consolidates
B．consists
C．considerate
D．consoles
(69) A．faced on
B．faced with
D．faced about
D．faced up to
(70) A．in general
B．in any term
C．in set terms
D．in terms of
(66) A．same
B．similar
C．different
D．difference
(67) A．same
B．similar
C．different
D．difference
(68) A．consolidates
B．consists
C．considerate
D．consoles
(69) A．faced on
B．faced with
C．faced about
D．faced up to
(70) A．in general
B．in any term
C．in set terms
D．in terms of
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