Cisco Designing Cisco Network Service Architectures (ARCH) v2.1 Set 1

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Cisco Designing Cisco Network Service Architectures (ARCH) v2.1 Set 1

A well-designed IP addressing scheme supporting role-based functions within the subnet will result in the most efficient use of which technology?

Layer 3 switching in the core ✘ Network Admission Control (NAC) ✘ IP telephony (voice and video) services ✘ ACLs ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which of the following is a result when designing multiple EIGRP autonomous systems within the Enterprise Campus network?

Improves scalability by dividing the network using summary routes at AS boundaries ✘ Decreases complexity since EIGRP redistribution is automatically handled in the background ✘ Reduces the volume of EIGRP queries by limiting them to one EIGRP AS ✘ Scaling is improved when a unique AS is run at the Access, Distribution, and Core layers of the network ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

When designing the routing for an Enterprise Campus network it is important to keep which of the following route filtering aspects in mind?

Filtering is only useful when combined with route summarization ✘ It is best to filter (allow) the default and summary prefixes only in the Enterprise Edge to remote sites orsite-to-site IPsec VPN networks ✘ IGPs (for example EIGRP or OSPF) are superior to route filtering in avoiding inappropriate transit trafficthrough remote nodes or inaccurate or inappropriate routing updates ✘ The primary limitation of router filtering is that it can only be applied on outbound updates ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which statement is the most accurate regarding IPsec VPN design for an Enterprise Campus environment?

VPN device IP addressing must align with the existing Campus addressing scheme. ✘ The choice of a hub-and-spoke or meshed topology ultimately depends on the number of remotes. ✘ Sizing and selection of the IPsec VPN headend devices is most affected by the throughput bandwidthrequirements for the remote offices and home worker ✘ Scaling considerations such as headend configuration, routing protocol choice, and topology have thebroadest impact on the design. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which unique characteristics of the Data Center Aggregation layer must be considered by an Enterprise Campus designer?

Layer 3 routing between the Access and Aggregation layers facilitates the ability to span VLANs across multiple access switches, which is a requirement for many server virtualization and clustering technologies. ✘ "East-west" server-to-server traffic can travel between aggregation modules by way of the core, butbackup and replication traffic typically remains within an aggregation module. ✘ Load balancing, firewall services, and other network services are commonly integrated by the use ofservice modules that are inserted in the aggregation switches. ✘ Virtualization tools allow a cost effective approach for redundancy in the network design by using two orfour VDCs from the same physical switch. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Support of vPC on the Cisco Nexus 5000 access switch enables various new design options for the data center Access layer, including which of the following?

The vPC peer link is not required for Access layer control traffic, and can instead be used to span VLANs across the vPC access switches ✘ A single switch can associate per-interface with more than one vPC domain ✘ vPC can be used on both sides of the MEC, allowing a unique 16-link EtherChannel to be built betweenthe access and aggregation switches ✘ Allows an EtherChannel between a server and a access switch while still maintaining the level ofavailability that is associated with dual-homing a server to two different access switches ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

The requirement for high availability within the Data Center network may cause the designer to consider which one of the following solutions?

Construct a hierarchical network design using EtherChannel between a server and two VDCs from the same physical switch ✘ Utilize Cisco NSF with SSO to provide intrachassis SSO at Layers 2 to 4 ✘ Define the Data Center as an OSPF NSSA area, advertising a default route into the DC andsummarizing the routes out of the NSSA to the Campus Core ✘ Implement network services for the Data Center as a separate services layer using an active/activemodel that is more predictable in failure conditions ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

When designing remote access to the Enterprise Campus network for teleworkers and mobile workers, which of the following should the designer consider?

It is recommended to place the VPN termination device in line with the Enterprise Edge firewall, with ingress traffic limited to SSL only ✘ Maintaining access rules, based on the source IP of the client, on an internal firewall drawn from aheadend RADIUS server is the most secure deployment ✘ VPN Headend routing using Reverse Route Injection (RRI) with distribution is recommended when theremote user community is small and dedicated DHCP scopes are in place ✘ Clientless SSL VPNs provide more granular access control than SSL VPN clients (thin or thick),including at Layer7 ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which of the following is most accurate with respect to designing high availability within the Enterprise Campus network?

High availability at and between the Distribution and Access layers is as simple as redundant switches and redundant Layer 3 connections ✘ Non-deterministic traffic patterns require a highly available modular topology design ✘ Distribution layer high availability design includes redundant switches and Layer 3 equal-cost loadsharing connections to the switched Access and routed Core layers, with a Layer 3 link between the Distribution switches to support summarization of routing information from the Distribution to the Core ✘ Default gateway redundancy allows for the failure of a redundant Distribution switch without affectingendpoint connectivity ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

10.

Which of the following should the Enterprise Campus network designer consider with respect to Video traffic?

While it is expected that the sum of all forms of video traffic will grow to over 90% by 2013, the Enterprise will be spared this rapid adoption of video by consumers through a traditional top-down approach ✘ Avoid bandwidth starvation due to video traffic by preventing and controlling the wide adoption ofunsupported video applications ✘ Which traffic model is in use, the flow direction for the traffic streams between the applicationcomponents, and the traffic trends for each video application ✘ Streaming video applications are sensitive to delay while interactive video applications, using TCP asthe underlying transport, are fairly tolerant of delay and jitter ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

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Cisco Designing Cisco Network Service Architectures (ARCH) v2.1 Set 1

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