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Q121. A client wants to consolidate applications that are currently housed at multiple sites to a remote data center. What two design requirements are unique to this scenario? (Choose two.)
A. bandwidth
B. security
C. latency
D. storage
E. availability
Answer: A,C
Q122. Which of these is the equation used to derive a 64 Kbps bit rate?
A. 2 x 8 kHz x 4-bit code words
B. 8 kHz x 8-bit code words
C. 2 x 4-bit code words x 8 kHz
D. 2 x 4 kHz x 8-bit code words
Answer: D
Explanation: While the human ear can sense sounds from 20 to 20, 000 Hz, and speech encompasses sounds from about 200 to 9000 Hz, the telephone channel was designed to operate at about 300 to 3400 Hz. This economical range carries enough fidelity to allow callers to identify the party at the far end and sense their mood. Nyquist decided to extend the digitization to 4000 Hz, to capture higher-frequency sounds that the telephone channel may deliver. Therefore, the highest frequency for voice is 4000 Hz. According to Nyquist theory, we must double the highest frequency, so 2x4kHz = 8kHz.
Each sample will be encoded into a 8-bit code. Therefore 8kHz x 8-bit code = 64 Kbps (notice about the unit Kbps: 8kHz = 8000 samples per second so 8000 x 8-bit = 64000 bit per second = 64 Kilobit per second = 64 Kbps)
Link: http://encyclopedia2.thefreedictionary.com/Nyquist+theorem
Note:
Nyquist theory:
“When sampling a signal (e.g., converting from an analog signal to digital), the sampling frequency must be greater than twice the bandwidth of the input signal in order to be able to reconstruct the original perfectly from the sampled version.”
Q123. What business trend allows employees to use personal devices to access enterprise data and systems?
A. ISE
B. BYOD
C. SAN
D. IOE
Answer: B
Q124. An organization needs a WAN Transport technology that meets these criteria:
. has a low initial cost
. provides low-to-medium BW
. has medium-to-high latency and jitter
Which technology should the organization use?
A. DSL
B. X.25
C. ISDN
D. wireless
E. analog modem
Answer: A
Q125. What wireless authentication option requires a Public Key Infrastructure?
A. EAP-TLS
B. PEAP
C. LEAP
D. EAP-FAST
Answer: A
Q126. A network engineer is using the traditional switched hierarchical design. The client has asked to increase uplink utilization from the access layer to the distribution. How can the engineer attain this new requirement without adding new physical connections?
A. enable spanning-tree portfast
B. enable VSS at the distribution layer
C. increase the MTU size on the uplink interfaces
D. ensure the root bridge priority is equal on both distribution switches
Answer: B
Q127. A spanning tree topology can be simplified by deploying what Cisco IOS technology in the distribution block?
A. VDC
B. vPC
C. Rapid PVST+
D. VSS
E. Flex Links
Answer: D
Q128. What submodule is found within the Enterprise Edge module?
A. enterprise WAN
B. remote branch
C. campus IPS
D. building distribution
Answer: A
Q129. A routing protocol neighbor relationship has been established between two routers across the public Internet using GRE. What technology can be used to encrypt this communication channel?
A. access lists
B. IP security
C. context based access
D. intrusion prevention system
Answer: B
Q130. Refer to the list of requirements. Which IP telephony design model should you implement to fulfill these requirements?.- must be a single, large location with many remote sites -must have multisite WAN connectivity - requires SRST for call processing redundancy
A. centralized
B. distributed
C. clustered
D. decentralized
Answer: A
