Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) .It is a ( ) information transfer mode.A.connection orientedB.connectionlessC.high bandwidth utilizationD.poor real-time
Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) .It is a ( ) information transfer mode.
A.connection oriented
B.connectionless
C.high bandwidth utilization
D.poor real-time
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In John Whitehead's opinion, which statement is true?A．Face recognition technology may interfere with people's privacy.B．Face recognition technology may enhance the country's constant surveillance.C．Face recognition technology can be used in the same way wiretaps are used.D．Face recognition technology can be used after its threat has been removed.
【An overall cellular network contains a number of different elements from the base transceiver station (BTS) itself with its antenna back through a base station controller (BSC), and a mobile switching centre (MSC) to the location registers (HLR and VLR) and the link to the public switched telephone network (PSTN). Of the units within the cellular network, the BTS provides the direct communication with the mobile phones. There may be a small number of base stations then linked to a base station controller. This unit acts as a small centre to route calls to the required base station, and it also makes some decisions about which of the base station is best suited to a particular call. The links between the BTS and the BSC may use either land lines of even microwave links. Often the BTS antenna towers also support a small microwave dish antenna used for the link to the BSC. The BSC is often co-located with a BTS. The BSC interfaces with the mobile switching centre. This makes more widespread choices about the routing of calls and interfaces to the land line based PSTN as well as the HLR and VLR.】 From the paragraph above, in a cellular network, the （98） can provide direct communication with a mobile phone, the （99） acts as a small centre to route calls to the required base station, and it also makes some decisions about which of the base station is best suited to a particular call.（100） can be used to link the BSC with related BTS。A. BSC B. BTS C. MSC D. VLR A. BSC B. BTS C. MSC D. HLR A. Land lines B. Microwave links C. Microwave dish antenna D. Land lines or microwave links
公众电话交换网(PSTN,PuBlic SwitcheD Telephone Network)是承载话音业务的基础网络,其采用的技术是()。 A.话音交换技术B.数据交换技术C.集中交换技术D.电路交换技术
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is a channel' s capacity which directly reflects the data transfer rate of the channel.(67)functions in a NetWare network which is used to define addressing schemes.(68)is a network layer device that suports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.(69)．is the popular LAN develped under the direction of the IEEE 802.3.(70)is a device which enables digital microcomputers to communicate across analog telephone lines.A．The volumeB．The bandwidthC．The noiseD．The delay
The(66)is a channel's capacity which directly reflects the data transfer rate of the channel.(67)functions in a NetWare network which is used to define addressing schemes.The(68)is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.(69)is the popular LAN developed under the direction of the IEEE802.3.The(70 is a device which enables digital microcomputers to communicate across analog telephone lines.A．volumeB．bandwidthC．noiseD．delay
whether to go with a shared or switched fast LAN technology once you start to max out your shared Ethernet of token-ring LAN is tough call. Users and analysts involved in(101)high-speed LANs have learned the benefits of each. However, there are trade-offs to each, and(102)which fast LAN technology to choose is critical for(103)network performance problems and(104)costly purchasing mistakes.A．avoidingB．clippingC．choosingD．decidingE．dissolving
Intermediate system to intermediate system (IS - IS), is a protocol used by network devices (routers) to determine the best way to forward datagrams through a packet - switched network, a process called routing. Which three attributes are of the IS - IS routing protocol? （）A. supports VLSMB. link - state routing protocolC. operati on is similar to BGPD. supports two routing levels within an autonomous system
In any NAT (network address translation) configuration, what is the Inside Global IP address?() A. The summarized address for all internal subnetted addresses.B. A private IP address assigned to a host on the inside network.C. A registered address that represents an inside host to an outside network.D. A unique IP address used on an internal networkE. Non of the above
Circuit-switching technology is used in Public Switched Telephone Network（PSTN）, Global System for Mobile Communications（GSM） and Code Division Multiple Access（CDMA）. It is a （ ） information transfer mode.A.Connection orientedB.connectionlessC.High bandwidth utilizationD.Poor-real-time
The project, ___________ by the end of 2020, will expand the city′ s telephone network to cover 1,000,000 users.A.accomplishedB.being accomplishedC.to be accomplishedD.having been accomplished
Which statements is true about Foreign Exchange Station （FXS） ports on a router？（）A、the FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central officeB、the FXS interface connect directly to a standard telephone， fax machine， or sililar device and supplies ring， voltage， and dial toneC、the FXS interface connect directly to an IP phone and supplies ring， voltage， and dial toneD、the FXS interface connect directly to ISDN voice channels
公众电话交换网（PSTN，PuBlic SwitcheD Telephone Network）是承载话音业务的基础网络，其采用的技术是（）。A、话音交换技术B、数据交换技术C、集中交换技术D、电路交换技术
Which statement is true about Foreign Exchange Station （FXS） ports on a router？（）A、The FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central office.B、The FXS interface connects directly to a standard telephone，fax machine，or similar device and supplies ring，voltage，and dial tone.C、The FXS interface connects directly to an IP phone and supplies ring，voltage，and dial tone.D、The FXS interface connects directly to ISDN voice channels.
In a switched LAN network, what is the Spanning-Tree algorithm used for?（）A、It is used to provide a mechanism for routing updates in switched environments.B、It is used to prevent routing loops in networks with redundant routes.C、It is used to prevent switching loops in networks with redundant switched routes.D、It is used to manage, the addition, deletion, and naming of VLANs across multiple switches.E、It is used to segment a network into multiple collision domains.F、None of the above.G、All of the above are functions of STP.
In any NAT (network address translation) configuration, what is the Inside Global IP address?（）A、The summarized address for all internal subnetted addresses.B、A private IP address assigned to a host on the inside network.C、A registered address that represents an inside host to an outside network.D、A unique IP address used on an internal networkE、Non of the above
Intermediate system to intermediate system (IS - IS), is a protocol used by network devices (routers) to determine the best way to forward datagrams through a packet - switched network, a process called routing. Which three attributes are of the IS - IS routing protocol? （） A、supports VLSMB、link - state routing protocolC、operati on is similar to BGPD、supports two routing levels within an autonomous system
Which device is normally used to translate telephone numbers or names to IP addresses for call routing in an H.323 network？ （）A、call agentB、IP phoneC、multipoint control unitD、gatekeeper
You are a network administrator for your company. The network consists of a single Active Directory domain. A user named Mary works in the information technology (IT) security department. Mary is a member of the ITSecurity global group. Mary reports that no one in the ITSecurity global group can access the security log from the console of a computer named Server1. You need to grant the ITSecurity global group the minimum rights necessary to view the security log on Server1. How should you modify the local security policy？（）A、Assign the Generate security audits user right to the ITSecurity global group.B、Assign the Manage auditing and security logs user right to the ITSecurity global group.C、Assign the Allow logon through Terminal Services user right to the ITSecurity global group.D、Assign the Act as part of the operating system user right to the ITSecurity global group.
单选题Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.Aconnection orientedBconnectionlessChigh bandwidth utilizationDpoor real-time
单选题An alternative to plain old telephone service (POTS) would be:（）AX.25.BAsynchronous transfer mode (ATM).CVoIP.DPublic Switched Telephone Network (PSTN).
单选题公众电话交换网（PSTN，PuBlic SwitcheD Telephone Network）是承载话音业务的基础网络，其采用的技术是（）。A话音交换技术B数据交换技术C集中交换技术D电路交换技术
单选题What type of services are provided by the Cisco IOS gateways in a VoIP network with Cisco CallManager functionality？ （）ACisco IOS gateways provide services such as address translation and network access control for the devices on the networlBCisco IOS gateways provide services such as bandwidth management and accountingCCisco IOS gateways provide media termination and signal translation between the public switched telephone network （PSTN） and IP networksDCisco IOS gateways provide zone management for all registered endpoints in the network
单选题Which statements is true about Foreign Exchange Station （FXS） ports on a router？（）Athe FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central officeBthe FXS interface connect directly to a standard telephone， fax machine， or sililar device and supplies ring， voltage， and dial toneCthe FXS interface connect directly to an IP phone and supplies ring， voltage， and dial toneDthe FXS interface connect directly to ISDN voice channels
单选题Which statement is true about Foreign Exchange Station （FXS） ports on a router？（）AThe FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central office.BThe FXS interface connects directly to a standard telephone，fax machine，or similar device and supplies ring，voltage，and dial tone.CThe FXS interface connects directly to an IP phone and supplies ring，voltage，and dial tone.DThe FXS interface connects directly to ISDN voice channels.
填空题PSTN的中文全程是（）最早的主要是提供电话业务。英文全程是Public Switch Telephone Network。