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The VoIP gateway can perform the digitization, （) and encapsulation required, and it contr

The VoIP gateway can perform the digitization, () and encapsulation required, and it controls the setup of VoIP calls between the calling device and the called device

A.amplification

B.depression

C.radiation

D.compression

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更多“The VoIP gateway can perform t…”相关的问题

第1题

以下下关于VoIP的描述不正确的是(60)。

A.VoIP系统一般由IP电话终端、网关(Gateway)、网(关)守(Gatekeeper)、网管系统、计费系统等几部分组成

B.在实现方式上，VoIP有电话机到PC、PC到电话机和PC到PC等3种方式

C.VoIP的关键技术包括信令技术、编码技术、实时传输技术、服务质量(QoS)保证技术以及网络传输技术等

D.VoIP的核心与关键设备是IP电话网关

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第2题

（) is called the gateway of network security, which is used to identify what kind of

() is called the gateway of network security, which is used to identify what kind of data packets can enter the enterprise intranet.

A、Anti-virus software

B、Trojan horse

C、Secret key

D、Firewall

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第3题

Network managers have long awaited practical voice-over-IP（VOIP)solutions. VOIP promises（7

Network managers have long awaited practical voice-over-IP(VOIP)solutions. VOIP promises(71)network management and decreases costs by(72)a company's telephony and data infrastructures into one network. And a VOIP solution implemented at a company' s head -quarters with far -reaching branch offices can(73)tremendous amounts of(74)in long distance phone bills, provided that solution delivers POTS -like voice(75)over the Internet.

A．complicated

B．useful

C．ease

D．orderly

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第4题

Network managers have long awaited practical voice-over-IP（VOIP)solutions. VOIP promises e

Network managers have long awaited practical voice-over-IP(VOIP)solutions. VOIP promises ease network management and decreases(66)by converging a company's telephony and data infrastructures into one network. And a VOIP solution implemented at a company's head-quarters with far-reaching branch offices can(67)tremendous amounts of money in long distance phone bills, provided that solution delivers POTS-like voice(68)over the Internet.

VOIP gateways are designed to convert voice from the(69)domain to the circuit switched domain. VOIP solutions use a digital signal processor(DSP)to process the voice data, preparing the voice sample for transmission by compressing voice and removing jitter. The VOIP equipment must comply with the(70)H.323 standard defined by the International Telecommunication Union, or ITU.

A．time

B．cash

C．costs

D．space

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第5题

Networks can be interconnected by different devices. In the physical layer, networks can b

e connected by(66)or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept(67), examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have(68)network layer, the router may be able to translate between the packet formats. In the transport layer we fmd transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message(69). As an example, gateways between Internet e-mail and X.400 e-mail must(70)the e-mail message and change various header fields.

A．repeaters

B．relays

C．connectors

D．modems

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第6题

Networks can be interconnected by different devices in the physical layer networks can be

connected by (71) or hubs．which just move the bits from one network to an identical network．One layer up we find bridges and switches which operate at data link layer．They can accept (72) ，examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer，we have routers that can connect two networks，If two networks have (73) network layer，the router may be able to translate betweenthe packer formats．In the transport layer we find transport gateway，which can interface between two transport connections Finally，in the application layer，application gateways translate message (74) ．As an example，gateways between Internet e-mail and X，400 e-mail must (75) thee-mail message and change various header fields．

(68)

A．reapers

B．relays

C．packages

D．modems

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第7题

【A popular service that has attercted the interest...

【A popular service that has attercted the interest of companies and has home users alike is the sending of voice signals over an IP-based network, such as the Internet. The practice of making telephone calls over the internet has had a number of different names, including packet voice, voice over packet, voice over the internet, internet telephone, and Voice over Ip（Voip）. But it appears the industry has settled on the term”Voice ove IP” in reference to the internet protocol, which controls the transfer of data over the internet. There are currently three ways to deliver VoIp to users, the first technique is found at the corporate level. Many companies are offering VoIP systerms that operate over a local area network. These systems involve a fair amount of equipment, such as VoIP servers, special IP-enabled telephones, and routers that can direct telephone calls. Today a large portion of corporate sites have converted their older internal telephone systems to VoIP systems that opreate over a LAN, thus converging two systems into one. A second common solution is the one often encountered at home. Using existing telephones, a special converter is added between the telephone and a high speed internet（DSL or cable modem）connection. The converter digitizes the voice signal and creates a stream of packets that are then sent over an ip connection.The third technique involves smart cell phones. Never cell technologies are all packet-based, thus requiring a telephone call to be converted to digital packets and sending those packets over IP networks.】

From the paragraph above，a popular service that has attracetd the interest of companies and home users,is termed as （） . The data transfer over the Internet is controlled by the （） . At corporate level, many companies have replaced their older internal telephone systerms with （） that oprerate over a local area network.

A、voice over the internet B、voice over packet C、Voice over IP D、internet telephony A、packet B、internet protocol C、industry D、VoIp servers A、VoIP systems B、IP-enablde telephones C、VoIP servers D、routers

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第8题

根据下面的文字资料回答 71～75 题 connected by（1 ）or Hubs,which just move the bits from on

e network to an identical network. One layer up we find bridgas and swiehes,which operate at data link layer. They can accept （2 ） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer,we have touters that can connect two netwoks. If two networks have（3 ）network layer,the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which cart interface between the two transport connections. Finally, in the application layer, application gateways translate message（4 ）. As an example,gateways between Internet e-mail and X.400 e-mail must （5 ）the e-mail message and change various header fields.

第6题：文中（1 ）处正确的答案是（）。

A．reapers

B．relays

C．connects

D．modems

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第9题

In enterprises, the gateway is the computer that（67)the traffic from a workstation to the

In enterprises, the gateway is the computer that(67)the traffic from a workstation to the outside network that is serving the Web pages. In homes, the gateway is the(68)that connects the user to the internet.

A．finds

B．searches

C．routes

D．tracks

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第10题

BGP是一类EGP（Exterior Gateway Protocol)协议，而OSPF和RIP等为IGP（Interior Gateway Protocol)协议。（)

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