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The corporate head office of TestKing has a teleconferencing

题目
单选题
The corporate head office of TestKing has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their destination out of sequence,what will happen?（）
A

UDP will send an ICMP Information Request to the source host.

B

UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

C

UDP will drop the datagrams.

D

UDP will use the sequence numbers in the datagram headers to reassemble the data in the correct order.

E

UDP will not acknowledge the datagrams and wait for a retransmission of the datagrams.

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相似问题和答案

第1题：

What do we know about the indian IT industry?

A． It will move its head office to shenzhen

B． It is seeking further decelopment in China

C． It has attracted an investment of US$15 billiom

D．It caught up with the US IT industry in2008.


正确答案：B

第2题：

The corporate head office of Ezonexam has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their destination out of sequence, what will happen?

A．UDP will send an ICMP Information Request to the source host.

B．UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

C．UDP will drop the datagrams.

D．UDP will use the sequence numbers in the datagram headers to reassemble the data in the correct order.

E．UDP will not acknowledge the datagrams and wait for a retransmission of the datagrams.


正确答案：B
解析：Explanation:
VOIP systems utilize UDP because it is faster and uses less overhead. In addition, the reliable transport mechanism used in TCP is useless to VOIP because if a packet gets dropped and needs to be resent, it will be already too late.

UDP provides a service for applications to exchange messages. Unlike TCP, UDP is connectionless and provides no reliability, no windowing, and no reordering of the received data. However, UDP provides some functions of TCP , such as data transfer, segmentation, and multiplexing using port numbers, and it does so with fewer bytes of overhead and with less processing required. UDP data transfer differs from TCP data transfer in that no reordering or recovery is accomplished. Applications that use UDP are tolerant of lost data, or they have some application mechanism to recover data loss.

第3题：

58 What do we know about the Indian IT industry?

A. It will move its head office to Shenzhen

B. It is seeking further development in China

C. It has attracted an investment of US$15 billion

D. It caught up with the US IT industry in2008.


正确答案：B

第4题：

TestKing has five regional offices that are located in different cities. The IT staff is evaluating WAN technologies to interconnect the regional offices to corporate headquarters. Each of the regional offices should be connected to the corporate headquarters in a hub and spoke arrangement using a packet-switched technology.Which of the following WAN technologies will fulfill these requirements?（）

A. Frame Relay

B. ISDN

C. T1 leased lines

D. Wireless


参考答案：A

第5题：

TestKing.com has a large corporate network that uses multiple routing protocols.Hosts in a portion of the network that uses EIGRP have become unreachable.Which router command will allow you, the network technician, to view the status of these routes?（）

A. TestKing# show eigrp entries

B. TestKing# show protocols

C. TestKing# debug eigrp routes

D. TestKing# show ip route eigrp

E. TestKing# show route eigrp


参考答案：D

第6题：

The advertisement said that an expanding company wished to _____ a secretary at their head office.

A: explore

B: exploit

C: employ

D: accept


正确答案: C

第7题：

You are the network administrator for the Beijing office of TestKing. A branch

office is located in Cairo. The DNS servers in both locations run Windows Server

2003.

The network uses two DNS namespaces internally. They are named

publishing.testking.com and testking.com. The locations of the primary name

servers are shown in the following table.

The Beijing office contains some servers that are registered in the testking.com zone

and other that are registered in the publishing.testking.com zone. All computers in

the Beijing office are configured to use the local DNS server as their preferred DNS

server. The two offices are connected only by using a VPN through the Internet.

Various network problems occasionally result in loss of connectivity between the

two offices.

Firewalls prevent the DNS servers in both offices from receiving queries from the

Internet.

You need to configure the DNS server in the Beijing office to allow successful

resolution of all queries from the Beijing office for names in the

publishing.testking.com namespace, even when the VPN link between the Beijing

and Cairo offices fails.

What should you configure on the DNS server in the Beijing office?（）


参考答案：B

第8题：

What do we know about Olivetti ?

A.It produced the best typewriter in the word.

B.It designed the word’s first mainframe. computer.

C.It exported more typewriter than other computer.

D.It has five independent companies with its head office in lvrea.


正确答案：D

第9题：

The LAN needs are expanding at the Testking corporate office, which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the TestKing network.Which of the following are layer 1 devices that you can use?（）

A. A switch.

B. A router.

C. A network adapter card.

D. A hub.

E. A repeater.


参考答案：D, E

第10题：

The Testking Corporation consists of the head office in New York with its regional offices in: Chicago, Detroit, Philadelphia, Toronto, and Atlanta. These offices need to be connected in a WAN, and Testking wishes to do this via a hub and spoke arrangement that will utilize packet-switched technology.Which one of the WAN technologies below would be the best choice for Testking?（）

A. ISDN

B. Wireless

C. Frame Relay

D. T1 leased line

E. ATM

F. VPN


参考答案：C

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