2013 Latest Cisco Designing for Cisco Internetwork Solutions Exam DESGN v2.1 640-864 EXAM download 86-90
A customer has the following Enterprise Campus design requirements:
at least 10 Gbps of bandwidth network runs of up to 40km no concern for transmission medium cost
Which transmission medium should you recommend to this customer?
A. unshielded twisted pair
B. shielded twisted pair
C. single-mode fiber
E. multimode fiber
Correct Answer: C
Section: Cabling Explanation
Below is the comparison of transmission media
(Reference from CCDA Official Exam Certification Guide. Some other books have different figures but we should answer it according to the Official book)
You design a network with the following network addresses:
Which route address is the best summary of these network addresses?
F. None of the above
Correct Answer: B
Section: IP addressing Explanation
Route Summarization is called route aggregation. Route aggregation creates one route in the routing table represents many other routes. Summarizing routes reduces the routing update traffic and reduces the number of routes in the routing table and overall router overhead in the router receiving the routes
Example of creating Summary Route:
192.168.168.0 = 11000000 10101000 10101 000 00000000
192.168.169.0 = 11000000 10101000 10101 001 00000000
192.168.170.0 = 11000000 10101000 10101 010 00000000
192.168.171.0 = 11000000 10101000 10101 011 00000000
192.168.172.0 =11000000 10101000 10101 100 00000000
192.168.173.0 = 11000000 10101000 10101 101 00000000
192.168.174.0 =11000000 10101000 10101 110 00000000
192.168.175.0 =11000000 10101000 10101 111 00000000
Number of Common Bits = 21 Number of Non-Common Network Bits = 3 Number of Host Bits = 8
So Answer 192.168.168.0/21 is correct.
Which two of the following statements represent a preferred wireless LWAPP implementation? (Choose two.)
A. verify open ports for: Layer 2 LWAPP on ethertype OxBBBB Layer 3 LWAPP on UDP 12222 and UDP 12223
B. use of Layer 3 LWAPP is preferred over Layer 2 LWAPP
C. use of Layer 2 LWAPP is preferred over Layer 3 LWAPP
D. verify open ports for: Layer 2 LWAPP on ethertype OxBABA Layer 3 LWAPP on UDP 12222 and TCP 12223
E. verify open ports for: Layer 2 LWAPP on ethertype OxABAB Layer 3 LWAPP on TCP 12222 and TCP 12223
Correct Answer: AB
Section: Wireless Explanation
Lightweight Access Point Protocol (LWAPP) is a draft Internet Engineering Task Force (IETF) standard for control messaging for setup, authentication, and operations between APs and WLAN controllers (WLC). In the LWAPP RFC draft, LWAPP control messages can be transported at Layer 2 tunnels or Layer 3 tunnels. Layer 2 LWAPP tunnels were the first method developed in which the APs did not require an IP address. The disadvantage of Layer 2 LWAPP was that the WLC needed to be on every subnet on which the AP resides. Layer 2 LWAPP is a deprecated solution for Cisco. Layer 3 LWAPP is the preferred solution. In the configuration, Layer 2 or Layer 3 transport modes can be selected. When set Layer 3, the LWAPP uses IP addresses to communicate with the access points; these IP addresses are collected from a mandatory DHCP server. When set to Layer 2, the LWAPP uses proprietary code to communicate with the access points.
Layer 2 LWAPP tunnels use EtherType code 0xBBBB. Layer 3 LWAPP uses UDP ports 12222 and 12223. Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 5
Which two capabilities of NetFlow accounting assist designers with network planning? (Choose two.)
A. the monitoring of processor time on network devices
B. the calculation of packet and byte counts of network traffic
C. the decoding and analyzing of packets
D. the presentation of a time-based view of application usage on the network
E. the monitoring of user network utilization
Correct Answer: BE
Section: Management – Operations Explanation
What is the benefit of deploying a gatekeeper in an H.323 IP telephony network?
A. provides spatial redundancy through the use of HSRP
B. provides load balancing via GUP when alternate gatekeepers are deployed
C. reduces configuration complexity by centralizing the dial plan
D. increases redundancy by allowing each gateway to maintain a copy of the dial plan
Correct Answer: C
Section: Voice Video Explanation
H.323 is a standard published by the ITU that works as a framework document for multimedia protocols, including voice, video, and data conferencing, for use over packet-switched networks. H.323 standards describe terminal (endpoints), gateway, gatekeeper, and multipoint control unit (MCU) devices to be used in a multimedia network.
As shown in Figure 14-20, H.323 includes the following elements:
Note. With a gatekeeper, each gateway contains a simpler dial plan and connects only to the gatekeeper. Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 14
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