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Q111. Which two can be used as a branch office WAN solution? (Choose two.)
A. frame relay
B. MPLS
C. Metro Ethernet
D. GPRS
E. dial-up modem
F. 3G USB modems
Answer: B,C
Explanation: Explanation Frame relay is old 'shared' technology today's sites use some flavor or Metro E or MPLS/VPN
Q112. When there is a need for immunity to EMI for connecting locations that are greater than 100 meters apart, which two solutions can be utilized? (Choose two.)
A. multimode fiber
B. Fiber Channel
C. HVDC transmission lines
D. single-mode fiber
E. serial RS-232
F. Gigabit Ethernet 1000BASE-CX
Answer: A,D
Q113. Which three are valid Layer 2 access designs? (Choose three.)
A. Looped Triangle
B. Looped Square
C. Looped U
D. Loop-Free Triangle
E. Loop-Free Square
F. Loop-Free U
Answer: A,B,F
Q114. A hierarchical design of the EIGRP domain facilitates which two of the following? (Choose two.)
A. route summarization
B. faster convergence
C. unequal cost load balancing
D. redistribution
E. virtual links
Answer: A,B
Q115. When designing using the Cisco Enterprise Architecture, in which Enterprise Campus layer does the Remote Access and VPN module establish its connection?
A. Building Access
B. Campus Core
C. Enterprise Branch
D. Enterprise Data Center
Answer: B
Q116. According to Cisco, which four improvements are the main benefits of the PPDIOO lifecycle approach to network design? (Choose four.)
A. faster ROI
B. improved business agility
C. increased network availability
D. faster access to applications and services
E. lower total cost of network ownership
F. better implementation team engagement
Answer: B,C,D,E
Explanation:
The PPDIOO life cycle provides four main benefits:
+ It improves business agility by establishing business requirements and technology strategies.
+ It increases network availability by producing a sound network design and validating the network operation.
+ It speeds access to applications and services by improving availability, reliability, security, scalability, and performance.
+ It lowers the total cost of ownership by validating technology requirements and planning for infrastructure changes and resource requirements.
(Reference: Cisco CCDA Official Exam Certification Guide, 3rd Edition) described in the link below. Link: http://www.ciscopress.com/articles/article.asp?p=1608131&seqNum=3
Q117. 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.”
Q118. You need to connect to a remote branch office via an Internet connection. The remote office does not use Cisco equipment. This connection must be secure and must support OSPF. Which of the following can be used to transport data to the branch office?
A. GRE over IPsec
B. IPsec
C. GRE
D. IPsec VTI
Answer: A
Q119. Which WLC interface is dedicated for WLAN client data?
A. virtual interface B. dynamic interface
C. management interface
D. AP manager interface
E. service port interface
Answer: B
Explanation:
WLC Interface Types
A WLC has five interface types:
Management interface (static, configured at setup, mandatory) is used for in-band management, connectivity to AAA, and Layer 2 discovery and association.
Service-port interface (static, configured at setup, optional) is used for out-of-band management. It is an optional interface that is statically configured.
AP manager interface (static, configured at setup, mandatory except for 5508 WLC) is used for Layer 3 discovery and association. It has the source IP address of the AP that is statically configured.
Dynamic interface (dynamic) is analogous to VLANs and is designated for WLAN client data.
Virtual interface (static, configured at setup, mandatory) is used for leaver 3 security authentication, DHCP relay support, and mobility management.
Q120. Which two are types of network virtualization? (Choose two.)
A. VSS: Virtual Switching System
B. VRF: virtual routing and forwarding
C. VCI: virtual channel identifier
D. VLSM: variable length subnet masking
E. VM: virtual machine
F. VMP: Virtual Memory Pool
Answer: A,B
Explanation:
Network virtualization encompasses logical isolated network segments that share the same
physical infrastructure. Each segment operates independently and is logically separate
from the other segments. Each network segment appears with its own privacy, security,
independent set of policies, QoS levels, and independent routing paths.
Here are some examples of network virtualization technologies:
VLAN: Virtual local-area network
VSAN: Virtual storage-area network
VRF: Virtual routing and forwarding
VPN: Virtual private network
VPC: Virtual Port Channel
