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Question 81:

An enterprise is designing a new network for multiple business units. Each unit has different security requirements and limited communication needs with other units. Which design approach is most appropriate?

1. Use a single unrestricted network
2. Extend all VLANs between business units
3. Create logical segmentation with controlled inter-segment communication
4. Disable routing between all business units

Correct Answer: 3

Explanation:

Logical segmentation allows the enterprise to separate business units while still providing controlled communication where required. Different security policies can be applied to each segment, and access between segments can be explicitly permitted according to business requirements. A single unrestricted network makes isolation difficult and increases the potential impact of security incidents. Extending VLANs between business units unnecessarily enlarges Layer 2 domains. Completely disabling routing may prevent legitimate business communication. The architect should identify required application flows, establish appropriate segmentation boundaries, and implement controlled connectivity between segments while maintaining operational visibility and scalability.

Question 82:

A company has critical applications that require connectivity even when a primary WAN circuit fails. Which design should be considered?

1. A single high-bandwidth circuit
2. Independent primary and backup WAN paths
3. Manual routing changes after every failure
4. One Layer 2 circuit shared by all applications

Correct Answer: 2

Explanation:

Independent primary and backup WAN paths provide a foundation for maintaining connectivity after a circuit failure. The paths should ideally have sufficient physical and logical diversity so that a single failure does not affect both. Dynamic routing or other appropriate mechanisms can detect failures and redirect traffic to the alternate path. A single high-bandwidth circuit remains a single point of failure regardless of its capacity. Manual routing changes increase recovery time and operational effort. Sharing one Layer 2 circuit does not provide meaningful path redundancy. The architecture should define failure scenarios, recovery objectives, and the required level of path diversity.

Question 83:

A network architect needs to determine whether an existing WAN can support projected traffic growth for the next three years. Which information is most useful?

1. Historical utilization, traffic trends, growth forecasts, and application requirements
2. Router hostname length
3. Number of unused console ports
4. Current switch firmware names only

Correct Answer: 1

Explanation:

Capacity planning should combine measured historical utilization with expected business and application growth. Traffic trends reveal how quickly bandwidth consumption is increasing, while application requirements indicate whether future workloads will have specific performance needs. Growth forecasts allow the architect to estimate when existing capacity may become insufficient. Hostname length and console-port availability do not provide meaningful information about WAN capacity. Firmware versions can be relevant to compatibility and lifecycle planning but do not independently determine traffic requirements. A data-driven capacity model allows the architect to identify future bottlenecks and plan upgrades before performance becomes unacceptable.

Question 84:

An enterprise uses BGP for Internet connectivity and wants to prevent accidental advertisement of private internal prefixes to an ISP. Which design mechanism is most appropriate?

1. Disable BGP completely
2. Use route filtering and explicit prefix policies
3. Advertise all internal routes first
4. Use STP to filter IP prefixes

Correct Answer: 2

Explanation:

Route filtering and explicit prefix policies can restrict which networks are advertised to external providers. The organization should define the prefixes that are legitimately intended for Internet advertisement and reject unintended routes. This protects against configuration mistakes that could expose internal addressing or create routing problems. Disabling BGP removes important capabilities and is not necessary to achieve prefix control. Advertising all internal routes creates the exact risk the design is intended to prevent. STP operates at Layer 2 and does not filter IP routing advertisements. External routing policy should therefore be explicitly defined, implemented, and validated.

Question 85:

A company wants to connect two data centers while minimizing the size of the Layer 2 failure domain. Which architecture should be evaluated first?

1. A fully extended Layer 2 network
2. A single large VLAN spanning both sites
3. A routed Layer 3 interconnection
4. One broadcast domain across all data centers

Correct Answer: 3

Explanation:

A routed Layer 3 interconnection can provide a clear boundary between data centers and limit the size of Layer 2 broadcast and failure domains. It can also simplify routing control and improve fault isolation. However, the final choice should depend on application requirements, such as whether specific workloads require Layer 2 adjacency or mobility. Extending one large Layer 2 domain across sites increases the scope of broadcasts and certain failures and can introduce additional operational complexity. The architect should document application dependencies before making the final decision, but a routed design is an important option when minimizing Layer 2 scope is a primary requirement.

Question 86:

A network supports voice, video, transactional applications, and bulk backups. The architect needs to define traffic classes. What should be the primary basis for classification?

1. Application requirements and traffic behavior
2. Device manufacturer
3. Physical rack location only
4. User’s monitor type

Correct Answer: 1

Explanation:

Traffic classification should be based on application requirements and observed traffic characteristics. Voice and interactive video may have strict delay and jitter requirements, while transactional applications may require predictable performance and backups may tolerate more variable latency. These characteristics can be translated into appropriate QoS classes and treatment. Device manufacturer does not determine the service requirements of traffic. Physical rack location may help identify where traffic originates but is not sufficient for defining service classes. Monitor type is unrelated. A well-designed QoS model should remain consistent across relevant network boundaries and should be validated against measurable application performance objectives.

Question 87:

A company has several branches connected to headquarters through a hub-and-spoke WAN. Branch-to-branch traffic currently travels through headquarters, creating unnecessary latency. What should the architect evaluate?

1. Direct branch-to-branch connectivity where requirements and security policies permit
2. Increasing the headquarters VLAN size
3. Removing all routing between branches
4. Disabling branch traffic monitoring

Correct Answer: 1

Explanation:

If branch-to-branch traffic is significant, direct connectivity between branches may reduce unnecessary hairpinning through headquarters. The architect should evaluate the traffic matrix, security requirements, WAN capabilities, routing scalability, and operational implications before changing the architecture. A direct path can improve latency and reduce unnecessary bandwidth consumption at the hub, but it may also increase routing complexity or security-policy requirements. Increasing VLAN size does not address WAN path inefficiency. Removing routing would prevent legitimate connectivity, while disabling monitoring reduces operational visibility. The design should be driven by measured traffic flows and business requirements.

Question 88:

An organization wants to isolate network management traffic from production traffic. Which approach provides logical separation while allowing shared physical infrastructure?

1. Use a dedicated management VRF or equivalent management network
2. Place management traffic in the same unrestricted VLAN
3. Disable authentication on management interfaces
4. Route management traffic through user networks without controls

Correct Answer: 1

Explanation:

A dedicated management VRF or equivalent management network can logically separate administrative traffic from production traffic. This reduces exposure and allows specific routing and security policies to be applied to management flows. Shared physical infrastructure can still be used while maintaining logical separation. Placing management traffic in the same unrestricted VLAN increases the potential attack surface. Disabling authentication creates an obvious security weakness, while routing management traffic through user networks without controls removes the intended isolation. The architecture should also consider centralized authentication, logging, access-control policies, out-of-band options, and availability of management connectivity during production-network failures.

Question 89:

A company is planning a network migration that will affect hundreds of sites. Which factor is most important when determining the migration sequence?

1. Random site selection
2. Dependencies, risk, business criticality, and validation results
3. Alphabetical order of site names
4. Number of employees’ monitors

Correct Answer: 2

Explanation:

Migration sequencing should account for technical dependencies, business criticality, risk, and lessons learned from earlier deployments. A pilot group can validate the design and operational procedures before broader rollout. Less complex or lower-risk sites may be useful early candidates, depending on the migration strategy. Random selection can expose critical services to unnecessary risk. Alphabetical ordering has no architectural significance, and monitor counts do not indicate network migration complexity. The architect should establish entry and exit criteria for each phase, define rollback procedures, and monitor application and network performance throughout the migration.

Question 90:

An enterprise has experienced routing-table growth as new branches are added. Which design decision can help maintain routing scalability?

1. Advertise every host route globally
2. Use hierarchical addressing and route summarization where feasible
3. Remove all route aggregation
4. Extend every branch into one Layer 2 domain

Correct Answer: 2

Explanation:

Hierarchical addressing allows related networks to be grouped into larger address blocks, which can then be summarized at appropriate routing boundaries. This reduces the number of individual prefixes that need to be carried by higher-level routing domains. Advertising host routes globally increases routing-table size and control-plane overhead. Removing aggregation works against scalability, while extending all branches into one Layer 2 domain does not solve routing-table growth and creates other scaling problems. Summarization must be carefully designed because it can affect reachability during failures if an aggregate remains advertised without an available more-specific path.

Question 91:

A business requires a network design that supports rapid recovery but has a limited budget. What should the architect do?

1. Deploy maximum redundancy everywhere
2. Ignore recovery requirements
3. Prioritize redundancy according to business-critical services and failure scenarios
4. Use no redundancy at all

Correct Answer: 3

Explanation:

When budgets are constrained, redundancy should be prioritized according to business impact and recovery requirements. Critical services may justify independent paths and additional protection, while lower-priority services may have less stringent recovery objectives. The architect should identify failure scenarios, quantify business impact, and map those requirements to appropriate redundancy mechanisms. Maximum redundancy everywhere may exceed the available budget and increase operational complexity. Eliminating redundancy can leave critical services exposed to avoidable failures. A risk-based approach allows limited resources to be focused where availability improvements provide the greatest business value.

Question 92:

An enterprise wants to ensure that routing changes do not propagate unnecessarily between different network regions. Which mechanism is useful?

1. Route filtering at defined routing boundaries
2. Increasing the number of global adjacencies
3. Removing summarization
4. Extending all Layer 2 networks

Correct Answer: 1

Explanation:

Route filtering at defined boundaries allows the architect to control which prefixes are exchanged between routing domains or regions. This can reduce unnecessary routing information and help prevent local changes from affecting unrelated parts of the network. Filtering should be carefully designed so that required reachability is preserved. Increasing the number of global adjacencies generally increases control-plane complexity. Removing summarization can expose more detailed routes, while extending Layer 2 does not provide appropriate Layer 3 route control. Filtering, summarization, and hierarchical routing can work together to create predictable propagation boundaries and improve overall routing stability.

Question 93:

A network architect is designing a highly available Internet edge with two providers. Which additional factor should be evaluated beyond having two physical connections?

1. Shared provider infrastructure and common failure points
2. Number of employee laptops
3. Keyboard layout used by administrators
4. Number of DNS aliases only

Correct Answer: 1

Explanation:

Two Internet connections do not automatically provide independent resiliency. The architect should determine whether both providers share infrastructure, buildings, conduits, upstream carriers, power systems, or other common dependencies. If a shared component fails, both connections could become unavailable simultaneously. The routing architecture should also define how traffic behaves when one provider fails and how prefixes are advertised and withdrawn. Employee laptop counts and keyboard layouts are unrelated to Internet-edge resiliency. DNS information may be relevant to application behavior but does not replace physical and routing diversity analysis. The complete failure domain must therefore be evaluated.

Question 94:

A company wants to ensure that a new network design can accommodate future application deployments without major architectural changes. Which approach is appropriate?

1. Design only for current traffic
2. Include growth projections, modularity, and scalable addressing and routing
3. Avoid documenting capacity assumptions
4. Use fixed configurations that cannot be expanded

Correct Answer: 2

Explanation:

A scalable architecture should account for expected growth in users, sites, applications, bandwidth, and routing information. Modular design allows additional capacity or network segments to be introduced without redesigning the entire environment. Scalable addressing supports future subnet allocation and summarization, while routing architecture should accommodate additional prefixes and domains. Designing only for current traffic can create expensive constraints as requirements evolve. Fixed configurations and undocumented assumptions make future expansion more difficult. The architect should document growth assumptions and identify thresholds that would trigger capacity upgrades or architectural changes.

Question 95:

A company is considering centralized versus distributed network services. Which factor should influence the decision?

1. Application latency, availability, operational requirements, and traffic patterns
2. Only the physical size of the headquarters
3. The number of office chairs
4. Switch vendor names alone

Correct Answer: 1

Explanation:

Centralized and distributed service architectures have different implications for latency, availability, bandwidth usage, failure domains, and operations. Centralization may simplify management but can create dependencies on WAN connectivity and centralized infrastructure. Distributed services can reduce latency and WAN utilization but may increase operational complexity. Traffic patterns and application dependencies help determine where services should be located. Headquarters size and office-chair counts do not provide meaningful architectural criteria, and vendor names alone cannot determine suitability. The architect should evaluate service requirements, user locations, failure scenarios, operational capabilities, and total lifecycle impact before selecting a model.

Question 96:

An organization wants to improve troubleshooting across a multi-site network. Which architectural capability is most useful?

1. Centralized visibility combined with consistent telemetry and logging
2. Disable all network logs
3. Use different monitoring standards at every site
4. Rely only on user complaints

Correct Answer: 1

Explanation:

Consistent telemetry and centralized visibility make it easier to correlate events across multiple network locations. Interface utilization, routing changes, device health, latency, packet loss, and security events can provide valuable evidence during troubleshooting. Standardized monitoring also allows the operations team to compare performance between sites and identify trends. Disabling logs removes useful diagnostic information, while inconsistent monitoring makes cross-site analysis more difficult. User reports remain useful but should complement technical telemetry rather than serve as the primary source of network information. The architecture should define monitoring coverage, retention, alerting, and escalation requirements.

Question 97:

A network uses multiple paths with different latency characteristics. An application is sensitive to packet reordering. What should the architect evaluate before enabling multipath forwarding?

1. Application behavior and whether traffic flows can tolerate path differences
2. Only the number of routers
3. Whether all interfaces have identical descriptions
4. Whether DNS servers use the same hostname

Correct Answer: 1

Explanation:

Multipath forwarding can send different traffic flows across paths with different characteristics. If those paths have significantly different latency, packets within an application flow could potentially experience different arrival times depending on the forwarding architecture. The architect should therefore understand application sensitivity, flow distribution behavior, path latency, and packet-ordering requirements before enabling multipath. Router counts and interface descriptions do not determine application compatibility. DNS naming is also unrelated to packet ordering. The design should be validated under realistic traffic conditions to ensure that multipath behavior improves utilization or resiliency without introducing unacceptable application performance issues.

Question 98:

A company wants to enforce consistent security policies across campus, data center, and WAN environments. Which design principle is most appropriate?

1. Define common security requirements while adapting enforcement to each architectural domain
2. Use no security controls in the WAN
3. Apply unrelated policies at every location
4. Allow unrestricted communication between all zones

Correct Answer: 1

Explanation:

A consistent security architecture should establish common principles and requirements while recognizing that enforcement mechanisms may differ between campus, WAN, and data center environments. For example, segmentation and least-privilege principles can apply across domains while using different controls appropriate to each location. Completely unrelated policies make governance and troubleshooting more difficult. Unrestricted communication increases the potential impact of security incidents, and omitting WAN security leaves an important boundary insufficiently protected. The architect should define trust zones, required communication flows, identity requirements, logging, and policy objectives, then map those requirements to the appropriate technologies.

Question 99:

A company is selecting between two network designs with similar technical capabilities. One requires significantly more operational effort. Which factor should be included in the comparison?

1. Operational complexity and lifecycle cost
2. Only initial hardware cost
3. Only interface speed
4. Only the number of routing protocols

Correct Answer: 1

Explanation:

Architecture decisions should consider the full lifecycle impact, not only initial hardware cost. Operational complexity can increase staffing requirements, troubleshooting time, change risk, training needs, and ongoing maintenance expenses. A design with similar technical capabilities but substantially higher operational effort may have different long-term implications. Interface speed and routing-protocol count are useful technical factors but do not fully describe operational impact. The architect should compare implementation cost, operating cost, scalability, resiliency, security, manageability, and migration requirements. Documenting these trade-offs helps stakeholders understand the broader consequences of each architectural alternative.

Question 100:

A network architect has completed a proposed enterprise architecture. Which final activity best confirms that the design is aligned with the original business requirements?

1. Compare the proposed architecture against documented requirements and measurable success criteria
2. Purchase hardware immediately
3. Remove all design documentation
4. Focus only on device configuration syntax

Correct Answer: 1

Explanation:

Architecture validation should trace the proposed design back to the original business and technical requirements. Each important requirement should have measurable success criteria, such as availability, latency, capacity, security isolation, recovery time, or scalability targets. The architect can then determine whether the design actually addresses the stated objectives and identify gaps before implementation. Purchasing hardware before completing this validation can lock the organization into an unsuitable design. Removing documentation eliminates traceability, while configuration syntax focuses on implementation details rather than architectural alignment. Requirements traceability provides a structured way to confirm that the proposed architecture solves the problems it was intended to address.