2013 Latest Cisco DESGN (640-864)Exam 186-190


Which statement is true about WANs?
A. Switches or concentrators often relay information through the WAN.
B. WANs typically encompass broad geographic areas.
C. In general, WAN technologies function at the middle three layers of the Open System Interconnection (OSI) model.
D. Users of WANs do not typically own all transmission facilities.
Correct Answer: B
Section: WAN VPN Explanation
WAN Defined
Wide-area networks (WAN) are communications networks that are used to connect geographically disperse network locations. Generally, WAN services are offered by service providers or telecommunication carriers. WANs can transport data, voice, and video traffic. Service providers charge fees, called tariffs, for providing
WAN services or communications to their customers. Sometimes the term service is referred to as the WAN communications provided by the carrier.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 6

Which item is not a true disadvantage of the full-mesh topology?
A. Central hub router represents a single point of failure in the network.
B. High level of complexity to implement.
C. Large number of packet replications required.
D. High costs due to number of virtual circuits. Correct Answer: A
Section: Design Explanation
Full-Mesh Topology
With full-mesh topologies, each site has a connection to all other sites in the WAN cloud (any-to-any). As the numbers of sites grow, so does the number of spoke connections that are ultimately required. Consequently, the full-mesh topology is not viable in very large networks. However, a key advantage of this topology is that it has plenty of redundancy in the event of network failures. But redundancy implemented with this approach does have a high price associated with it. Here are some issues inherent with full-mesh topologies:
The number of VCs required for a full mesh can be calculated using the formula ((N C 1) x N / 2). For example if you have 4 sites, ((4 C 1) x 4 / 2) = 6 VCs are required.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition

Which IPv4 field are the precedence bits located in?
A. IP destination address
B. Type-of-Service field
C. IP options field
D. IP protocol field
Correct Answer: B
Section: IP addressing Explanation

ToS (Type of Service): This field is 8 bits in length. Quality of service (QoS) parameters such as IP
precedence or DSCP are found in this field.

Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 8

Which hierarchical layer has functions such as High availability, port security, and rate limiting?
A. Core
B. Access
C. Network
D. Distribution
Correct Answer: B
Section: Design Explanation
Access Layer
The access layer provides user access to local segments on the network. The access layer is characterized by switched LAN segments in a campus environment. Microsegmentation using LAN switches provides high bandwidth to workgroups by reducing the number of devices on Ethernet segments.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 2

With which of the following capabilities does RIPv2 improve RIPv1?
A. Multicast updates, authentication, variable-length subnet mask (VLSM)
B. Authentication, VLSM, hop count
C. Multicast updates, authentication, hop count
D. Multicast updates, hop count
Correct Answer: A
Section: Routing Explanation
RIPv2 improves on RIPv1 with the ability to use VLSM, with support for route authentication, and with multicasting of route updates. RIPv2 supports CIDR. It still sends updates every 30 seconds and retains the 15-hop limit; it also uses triggered updates. RIPv2 still uses UDP port 520; the RIP process is responsible for checking the version number. It retains the loop-prevention strategies of poison reverse and counting to infinity. On Cisco routers, RIPv2 has the same administrative distance as RIPv1, which is 120. Finally, RIPv2 uses the IP address when multicasting route updates to other RIP routers. As in RIPv1, RIPv2 by default summarizes IP networks at network boundaries. You can disable autosummarization if required.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 10

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