2013 Latest Cisco Designing for Cisco Internetwork Solutions Exam DESGN

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2013 Latest Cisco Designing for Cisco Internetwork Solutions Exam DESGN v2.1 640-864 EXAM download 71-75

d1
Which two statements about IPv6 addresses are true? (Choose two.)
A. Two colons (::) are used to represent successive hexadecimal fields of zeros.
B. Leading zeros are required.
C. Two colons (::) are used to separate fields.
D. A single interface will have multiple IPv6 addresses of different types.
Correct Answer: AD
Section: IP addressing Explanation

QUESTION 72
Which three security measures can be used to mitigate DoS attacks that are directed at exposed hosts within the E-Commerce module? (Choose three.)
A. Use NIDSs and HIPSs to detect signs of attack and to identify potentially successful breaches.
B. Partition the exposed hosts into a separate LAN or VLAN.
C. Use LAN switch VTP pruning to separate hosts on the same segment.
D. Use a VPN concentrator (IPSec) to protect and verify each connection to the exposed host or hosts.
E. Use firewalls to block all unnecessary connections to the exposed hosts.
Correct Answer: ABE
Section: Security Explanation

QUESTION 73
Which technology can ensure data confidentiality, data integrity, and authentication across a public IP network?
A. VSANs
B. VPDNs
C. VLANs
D. GRE
E. IPsec
Correct Answer: E
Section: Security Explanation

IPsec – A security architecture that operates in a host to protect IP traffic. The IETF defined IPsec in RFC
4301. IPsec uses open standards and provides secure communication between peers to ensure data
confidentiality, integrity, and authentication through network layer encryption.

Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition

QUESTION 74
Which statement best describes Call Admission Control?
A. It extends QoS capabilities to protect voice from excessive data traffic.
B. It protects voice from voice.
C. It provides endpoint registration control.
D. It provides endpoint bandwidth control.
Correct Answer: B
Section: Voice Video Explanation
CAC should be used to keep excess voice traffic from the network by ensuring that there is enough bandwidth for new calls. Call admission control (CAC) is used to control the number of calls to reduce the WAN bandwidth for a site that has IPT. CAC is configured for the site on the CUCM servers. A maximum bandwidth or maximum number of calls is provisioned for the site. CAC enforces a maximum number of calls between two locations to ensure that call quality will not be degraded by allowing more calls than a network can support. CAC causes excessive calls between two locations to be refused. The IPT system must then either reroute the call to different available path, such as the PSTN, or deny the call.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 14

QUESTION 75
A customer wishes to implement VoIP using centralized call-processing. In addition, the customer wishes to have voice quality and good bandwidth utilization. Which codec would you suggest?
A. G.711
B. G.729
C. G.726
D. G.723.1
Correct Answer: B
Section: Voice Video Explanation

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