VOIP has been implemented at the main office of the Company network. Which two statements  are true about voice packets in a LAN？（）

A . allowed codecs B . native VLAN C . auxiliary VLAN D . Cisco Unified Communications Manager IP address E . RSTP

A . 90 milliseconds B . 120 milliseconds C . 150 milliseconds D . 240 millisecond

A . because B . in reason of C . owing to D . for

A . A WLAN client will operate in half-duplex mode. B . The Aironet 1230 access point is an example of an access point that operates solely as a lightweight access point. C . Ad hoc mode allows mobile clients to connect directly without an intermediate AP. D . WLANs are designed to share the medium and can easily handle an increased demand of channel contention. E . A lightweight AP receives control and configuration from a WLAN controller to which it is associated. F . Another term for infrastructure mode is independent service set （IBSS）.

A . Update the .kshrc file B . Edit $HOME/.dtprofile, and uncomment the DTSOURCEPROFILE=true C . Copy /etc/.profile to $HOME/.dtprofile and edit the file as needed D . Double click on the System Administration icon and select CDE profile

A . statistics recommendations B . SQL profile recommendations C . index-related recommendations D . restructuring of SQL recommendatio

A .  InterVLAN routing cannot be filtered by the router. B .  The router becomes a single point of failure for the network. C .  Routers will not route STP BPDUs. D .  There is a possibility of inadequate bandwidth for each VLAN. E .  Additional overhead on the router can occur. F .  NetFlow Switching is required for InterVLAN accounting.

A . the fuel tank fill pipe should be left open to allow vapors to vent from the tank B . the engine should be started immediately to prevent vapor lock in the fuel line C . all hatches should be opened and all compartments should be ventilated D . open the fuel line and drain a small amount of gasoline into the bilge to clear the line of sediment

A .  statistics recommendations B .  SQL profile recommendations C .  index-related recommendations D .  restructuring of SQL recommendatio

A . after B . since C . before D . for

A . put up with B . put off C . put out D . put of

A . Mis-routed packets B . Excess jitter C . Delay of critical traffic D . Packet loss due to congestion E . Data link layer broadcast storms F . FTP connections unsuccessful

A . gatekeeper B . Call Routing C . Call Admission Control D . Digital Signal Processor

A .  DAI can be performed on ingress ports only. B .  DAI can be performed on both ingress and egress ports. C .  DAI is supported on access ports， trunk ports， EtherChannel ports， and private VLAN ports.   D .  DAI should be enabled on the root switch for particular VLANs only in order to secure the ARP  caches of hosts in the domain. E .  DAI should be configured on all access switch ports as untrusted and on all switch ports connected to other switches as trusted. F .  DAI is supported on access and trunk ports only.

A . done B . made C . produced

A talented people． B timber． C flesh water． D money．

A．to attract the public's attention. B．to reduce staff turnover. C．to solve labor disputes. D．to show off financial resources. 此题为多项选择题。

A. statistics recommendations B. SQL profile recommendations C. index-related recommendations D. restructuring of SQL recommendations