2013 Latest DESGN (640-864) Exam 111-115


A company is designing a worldwide IPv6 network with duplicated file servers at multiple locations. Each file server contains identical reference information. Which IPv6 address type would be used to allow each end station to send a request to the nearest file server using the same destination address, regardless of the location of that end station?
A. broadcast
B. multicast
C. anycast
D. unicast
Correct Answer: C
Section: IP addressing Explanation
IPv6 Anycast Addresses The IPv6 anycast (one-to-nearest) address identifies a set of devices. An anycast address is allocated
from a set of unicast addresses. These destination devices should share common characteristics and are explicitly configured for anycast. You can use the anycast address to identify a set of routers or servers within an area. When a packet is sent to the anycast address, it is delivered to the nearest device as determined by the routing protocol. An example of the use of anycast addresses is to assign an anycast address to a set of serversone in North America, and the other in Europe. Users in North America would be routed to the North American server, and those in Europe to the European server. You cannot use an anycast address as a source address. Also, you must explicitly configure nodes to which the anycast address is assign to recognize the anycast address.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 9

When designing using the Cisco Enterprise Architecture, in which Enterprise Campus layer do the Enterprise Edge and Enterprise WAN modules establish their connection?
A. Building Access
B. Building Distribution
C. Campus Core
D. Enterprise Branch
E. Enterprise Data Center
Correct Answer: C
Section: Architecture Explanation
The Enterprise Edge connects to the edge-distribution module of the enterprise campus. In small and medium sites, the edge distribution can collapse into the campus-backbone component. It provides connectivity to outbound services that are further described in later sections.
See Q23

Which three of these describe the best practice for Cisco wireless outdoor Mesh network deployment? (Choose three.)
A. mesh hop counts of 4 or fewer
B. RAP implemented with 20 or fewer MAP nodes
C. client access via 802.11a and backhaul with 802.11b/g
D. client access via 802.11b/g and backhaul with 802.11a
E. mesh hop counts of 8 to 4
F. RAP implemented with 20 to 32 MAP nodes
Correct Answer: ABD
Section: Wireless Explanation

Wireless Mesh Design Constraints

When designing and building a wireless mesh network with the 1500 Mesh AP, there are a number of system characteristics to consider. Some of these apply to the backhaul network design and others to the WLC design:
Recommended backhaul is 18 Mbps18 Mbps is chosen as the optimal backhaul rate because it aligns with the maximum WLAN coverage distances of the MAP; that is, the distance between MAPs using 18 Mbps backhaul should allow for seamless WLAN client coverage between the MAPs. A lower bit rate may allow a greater distance between 1500 Mesh APs, but there are likely to be gaps in the WLAN client
coverage and the capacity of the backhaul network is reduced. An increased bit rate for the backhaul network either requires more 1500 Mesh APs or results in a reduced SNR between mesh APs, limiting mesh reliability and interconnection. The wireless mesh backhaul bit rate, like the mesh channel, is set by the RAP.
Number of backhaul hops should be limited to three to fourThe number of hops is recommended to be limited to three to four primarily to maintain sufficient backhaul throughput, because each mesh AP uses the same radio for transmission and reception of backhaul traffic. This means that throughput is approximately halved over every hop. For example, the maximum throughput for an 18 Mbps is approximately 10 Mbps for the first hop, 5 Mbps for the second hop, and 2.5 Mbps for the third hop.
Number of MAPs per RAPThere is no current software limitation of how many MAPs per RAP you can configure. However, it is suggested that you limit this to 20 MAPs per RAP to avoid bottle necks in your mesh.
Number of APs per controllerThe number of APs per controller is determined by the controller capacity.
Number of controllersThe number of controllers per mobility group is limited to 24.

The Cisco Data Center Network Architecture comprises which two Cisco SONA layers? (Choose two.)
A. Collaboration Applications
B. WAN/Internet
C. Interactive Services
D. Network Infrastructure
E. Business Applications
Correct Answer: CD
Section: Data Center Explanation
The SONA framework define the following three layers:
Networked Infrastructure layer: Where all the IT resources interconnect across a converged network foundation. The objective of this layer is to provide connectivity, anywhere and anytime.
Interactive Services layer: Includes both application networking services and infrastructure services. This layer enables efficient allocation of resources to applications and business processes delivered through the networked infrastructure.
Application layer: Includes business applications and collaboration applications. The objective of this layer is to meet business requirements and achieve efficiencies by leveraging the Interactive Services layer.

Which two of these are scalability benefits of designing a network that utilizes VPNs? (Choose two.)
A. reduces dial infrastructure expenditures
B. reduces the number of physical connections
C. allows networks to be set up and restructured quickly
D. simplifies the underlying structure of a customer WAN
E. extends the network to remote users
Correct Answer: BD
Section: WAN VPN Explanation

Original answer were “reduces dial infrastructure expenditures” and “reduces the number of physical
connections”, but the question it to do with specifically scalability NOT all benefits?

What Are the Advantages and Benefits of a VPN?
A VPN – Virtual Private Network – is one solution to establishing long-distance and/or secured network connections. VPNs are normally implemented (deployed) by businesses or organizations rather than by individuals, but virtual networks can be reached from inside a home network. Compared to other technologies, VPNs offers several advantages, particularly benefits for wireless local area networking.
Answer: For an organization looking to provide a secured network infrastructure for its client base, a VPN offers two main advantages over alternative technologies: cost savings, and network scalability. To the clients accessing these networks, VPNs also bring some benefits of ease of use.
Cost Savings with a VPN
A VPN can save an organization money in several situations: VPNs vs leased lines – Organizations historically needed to rent network capacity such as T1 lines to achieve full, secured connectivity between their office locations. With a VPN, you use public network infrastructure including the Internet to make these connections and tap into that virtual network through much cheaper local leased lines or even just broadband connections to a nearby Internet Service Provider (ISP).
Long distance phone charges – A VPN also can replace remote access servers and longdistance dialup network connections commonly used in the past by business travelers needing to access to their company intranet. For example, with an Internet VPN, clients need only connect to the nearest service provider’s access point that is usually local.
Support costs – With VPNs, the cost of maintaining servers tends to be less than other approaches because organizations can outsource the needed support from professional third party service providers. These provides enjoy a much lower cost structure through economy of scale by servicing many business clients.
so better answer would be “reduces the number of physical connections” and “simplifies the underlying structure of a customer WAN” because
VPNs offer flexiblity as site-to-site and remote-access connections can be set up quickly and over existing infrastructure. A variety of security policies can be provisioned in a VPN,enabling flexible interconnection of different security domains.
VPNs also offer scalability over large areas, as IP transport is universally available. This in turn reduces the number of physical connections and simplifies the underlying structure of a customer WAN.
Lower cost is one of the main reasons for migrating from traditional connectivity options to a VPN connection, as customers may reuse existing links and take advantage of statistical packet multiplexing features of IP networks, used as a VPN transport.
Reference: http://www.slideshare.net/hussein_kgb/1ip-tunneling-and-vpn-technologies-101220042129-phpapp01
Benefits of VPNs
The benefits of using VPNs include the following:
Flexibility: VPNs offer flexibility because site-to-site and remote-access connections can be set up quickly and over existing infrastructure to extend the network to remote users. Extranet connectivity for business partners is also a possibility. A variety of security policies can be provisioned in a VPN, thereby enabling flexible interconnection of different security domains.
Scalability: VPNs allow an organization to leverage and extend the classic WAN to more remote and external users. VPNs offer scalability over large areas because IP transport is universally available. This arrangement reduces the number of physical connections and simplifies the underlying structure of a customers WAN.
network communication cost: Lower cost is a primary reason for migrating from traditional connectivity options to a VPN connection. Reduced dialup and dedicated bandwidth infrastructure and service provider costs make VPNs attractive. Customers can reuse existing links and take advantage of the statistical packet multiplexing features.
Reference: http://ciscodocuments.blogspot.com.au/2011/06/chapter-5-designing-remote-connectivity_16. html

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