2013 Latest Cisco DESGN (640-864) Exam 121-125

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QUESTION 121
You are designing IPv6 into an existing IPv4 network. Which two strategies can you use to allow both address schemes to coexist, thus facilitating migration? (Choose two)
A. translate one protocol into the other
B. redistribute between IPv6-capable and non-IPv6-capable routing protocols
C. encapsulate IPv6 packets within IPv4 packets
D. bridge between the IPv6 and IPv4 networks
E. enable anycast capability in the routing protocol
Correct Answer: AC
Section: IP addressing Explanation

IPv4 to IPv6 Transition Mechanisms and Deployment Models

This section describes transition mechanisms and deployment models to migrate from IPv4 to IPv6. During a transition time, both protocols can coexist in the network. The three major transition mechanisms are Each model provides several advantages and disadvantages; familiarize yourself with those. Of all these models, the dual-stack model is recommended because it requires no tunneling and is easier to manage.
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 9

QUESTION 122
A network is being designed to meet the requirements listed.
Within the enterprise network:
All routers are Cisco 3800 Series routers running the latest Cisco IOS release.

The fastest convergence time possible is required.
Unequal cost load-balancing is required.
For Internet connections:
A single link is used to connect to a single ISP.
Which two routing protocols should be used? (Choose two.)

A. Use Internal BGP as the IGP within the enterprise.
B. Use Static (Default) routing between the enterprise and the ISP.
C. Use OSPF as the IGP within the enterprise.
D. Use EIGRP as the IGP within the enterprise.
E. Use EIGRP between the enterprise and the ISP.
F. Use External BGP between the enterprise and the ISP.
Correct Answer: BD
Section: Routing Explanation
The requirements are to have an IGP that have the fastest possible convergence and Unequal cost load balancing. The routing protocol options listed are BGP, Static, OSPF, and EIGRP. EIGRP has the fastest convergence time and supports unequal cost load balancing. BGP has the slowest possible convergence time. Static routes do not support unequal cost load balancing. OSPF has a slower convergence time than EIGRP. In regards to the ISP connection typically you would use an EGP or static route. The only EGP available is BGP. However, BGP should ONLY be used when connecting to multiple ISPs or with multiple default gateways. Not to mention this adds additional layers of complexity and slows down convergence time. The best option for a single internet connection is to configure a static route.

QUESTION 123
Which two statements best describe Cisco Wireless LAN Guest Access in a Cisco Unified Wireless Network? (Choose two.)
A. Dedicated guest VLANs are only extended to the wireless controllers in the network to ensure path isolation.
B. Guest tunnels have limitations on which wireless controllers can originate the tunnel.
C. Dedicated guest VLANs are extended throughout the network to the access points for path isolation.
D. Guest tunnels can originate and terminate on any wireless controller platform.
E. Guest tunnels have limitations on which wireless controllers can terminate the tunnel.
F. Dedicated guest access in the DMZ extends from the origination to the termination controllers without dedicated guest VLANs.
Correct Answer: EF
Section: Wireless Explanation

Using EoIP Tunnels for Guest Services

Basic solutions use separate VLANs for guest and corporate users to segregate guest traffic from corporate traffic. The guest SSID is broadcast, but the corporate SSID is not. All other security parameters are configured. Another solution is to use Ethernet over IP (EoIP) to tunnel the guest traffic from the CAPWAP to an anchor WLC.
As shown in Figure 5-17, EoIP is used to logically segment and transport guest traffic from the edge AP to the anchor WLC. There is no need to define guest VLANs in the internal network, and corporate traffic is still locally bridged. The Ethernet frames from the guest clients are maintained across the CAPWAP and EoIP tunnels.
Figure. EoIP Tunnels
Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 5

QUESTION 124
Which technology is IPsec required for a site-to-site enterprise WAN/MAN architecture?
A. self-deployed MPLS
B. ATM
C. Frame Relay
D. SP MPLS VPN
E. ISP Service
Correct Answer: E
Section: WAN VPN Explanation

QUESTION 125
Refer to the exhibit. Which statement accurately represents the characteristics of the core layer in this design?
A. Access lists should be used in the core to perform packet manipulation.
B. QoS should be performed only in the core.
C. Load balancing should never be implemented or used in the core.
D. It is acceptable to use a partial mesh in the core if it is connected to each device by multiple paths.
E. Policy-based traffic control is implemented in the core to enable prioritization, ensuring the best performance for all time-critical applications.
Correct Answer: D
Section: Architecture Explanation

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