單項(xiàng)選擇題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.


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1.多項(xiàng)選擇題Which two statements are true about the digital audio in a VoIP network?()

A.Standard encoding techniques create an uncompressed digital data rate of 4000 bps.
B.Standard encoding techniques create an uncompressed digital data rate of 8000 bps.
C.Standard encoding techniques create an uncompressed digital data rate of 64,000 bps.
D.Voice quality is not a concern if compression is not used.
E.Two methods of quantization are linear and logarithmic.
F.Two methods of compression are u-law and a-law.

2.多項(xiàng)選擇題Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks?()

A.The three required steps in the analog to digital conversion are sampling,encoding,and compression.
B.The three required steps in the analog to digital conversion are sampling,quantization,and compression.
C.The three required steps in the analog to digital conversion are sampling,quantization,and encoding.
D.The output of the sampling process is a pulse code modulation (PCM) signal.
E.The output of the sampling process is a pulse amplitude modulation (PAM) signal.

3.多項(xiàng)選擇題Which two statements are true about the various methods of implementing QoS?()

A.Cisco AutoQoS can be used repeatedly to apply a single QoS policy to multiple interfaces.
B.Cisco AutoQoS includes an optional web-based GUI for automating the configuration of QoS services.
C.Cisco AutoQoS provides capabilities to automate VoIP deployments.
D.The auto qos global configuration command is used to configure Cisco AutoQoS.
E.The Modular QoS CLI (MQC) is the best way to fine tune QoS configurations.
F.The SDM QoS wizard is the fastest way to implement QoS.

4.多項(xiàng)選擇題Which two statements about the DiffServ QoS model are true?()

A.DiffServ requires RSVP to set up a path through the network to accommodate the requested QoS.
B.Network traffic is identified by class, and the level of service is chosen for each class.
C.The DiffServ model relies on a fairly simple mechanism to provide QoS over a wide range of equipment.
D.RSVP enables the DiffServ model to provide end-to-end QoS.
E.The DiffServ model is more scalable than the IntServ model.
F.The flow-based approach of the DiffServ model is ideal for large scalable implementations such as the public Internet.

5.單項(xiàng)選擇題What form of AutoQoS is supported on Cisco Catalyst 2950 switches with the Enhanced Image?()

A.AutoQos Enterprise
B.AutoQoS Campus
C.AutoQoS VoIP
D.AutoQoS LAN

7.多項(xiàng)選擇題Which three methods would help prevent critical network-traffic packet loss on high speed serial interfaces?()

A.policy routing
B.increase link capacity
C.WRED
D.CBWFQ
E.LFI
F.WFQ

8.多項(xiàng)選擇題Which two steps are executed in the deployment of Cisco AutoQoS for Enterprise?()

A.The customer uses SNMP statistics to create the policy.
B.QoS policy templates are generated and installed on the interface.
C.RTP is used to generate the policy.
D.LLQ,cRTP,and LFI are used to automatically discover the policy.
E.The auto-generated policy is manually optimized before implementation.
F.Auto-discovery is used to determine what traffic is on the interface.

9.多項(xiàng)選擇題What are three security problems with Wi-Fi Protected Access (WPA)?()

A.WPA is based on the outdated IEEE 802.11i standard.
B.WPA uses RSN,which uses the same base encryption algorithm as RC4.
C.WPA requires a hardware upgrade that may not be supported by all vendors.
D.WPA uses TKIP,which uses the same base encryption algorithm as WEP.
E.WPA is susceptible to a DoS attack when it receives two packets in quick succession with bad MICs,forcing the AP to shut down the entire Basic Service Set (BSS) for one minute.
F.WPA is susceptible to a security weakness when preshared keys are used.

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