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| Section | Objectives |
|---|---|
| Topic 1: Security Design in Enterprise Networks | - Segmentation and access control design - VPN and perimeter security architecture |
| Topic 2: Network Automation and Programmability | - Controller-based networking design - API-driven network automation concepts |
| Topic 3: Network Services Design | - Routing protocols design (OSPF, EIGRP, BGP) - Multicast and QoS design considerations |
| Topic 4: WAN and Edge Connectivity Design | - Traditional WAN and internet edge design - SD-WAN architecture and design considerations |
| Topic 5: Enterprise Network Design Principles | - Design methodologies and best practices - Scalability and high availability design |
| Topic 6: Enterprise Campus Network Design | - Spine-leaf and hierarchical design models - Campus LAN architecture |
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NEW QUESTION # 156
Since installing a cisco TelePresence system, the company is experiencing other application having response issues when the system in use. As a result, the company asked an architect to recommend a QoS solution. The customer is currently using a CBWFQ policy to manage traffic on an internet connection with a speed of 100 Mbps. Which link-capacity limit must the architect choose for strict-priority for the real-time traffic?
Answer: B
Explanation:
Cisco Technical Marketing testing has shown a significant decrease in data application response times when real-time traffic exceeds one-third of a link's bandwidth capacity. Extensive testing and customer deployments have shown that a general best queuing practice is to limit the amount of strict-priority queuing to 33 percent of a link's capacity. This strict-priority queuing rule is a conservative and safe design ratio for merging real-time applications with data applications.
https://www.ciscopress.com/articles/article.asp?p=357102&seqNum=7
NEW QUESTION # 157
An engineer is designing a QoS policy that queues excess packets for later transmission. Which mechanism must be included in the design?
Answer: B
Explanation:
Traffic shaping is the QoS mechanism that queues excess packets and transmits them later to conform to a configured rate. In Cisco QoS design, shaping smooths bursts by buffering traffic instead of immediately discarding it when the offered rate exceeds the configured rate. This makes shaping appropriate on egress interfaces where the enterprise router has a higher physical interface speed than the actual provider committed information rate. WRED and RED are congestion-avoidance mechanisms that drop packets probabilistically to prevent full queue exhaustion, especially for TCP traffic. They do not intentionally hold excess packets for later transmission as the primary behavior. Policing enforces a traffic rate by dropping or remarking traffic that exceeds the configured contract; it does not buffer traffic to smooth bursts. Therefore, when the design requirement says excess packets must be queued for later transmission, the mechanism must be shaping. In WAN edge QoS, shaping is often paired with child queuing policies so latency-sensitive and business-critical classes receive correct treatment inside the shaped parent rate.
NEW QUESTION # 158
An engineer must design a solution to connect a customer to the Internet. The solution will include a Layer 3 circuit with a CIR of 50 Mbps from the service provider. The hand-off from the provider ' s switch to the customer ' s router is 1Gbps. Which solution should the engineer include to prevent potential issues with choppy voice traffic?
Answer: B
Explanation:
Hierarchical QoS with a parent shaping policy is the correct solution for a 1 Gbps physical handoff where the contracted provider rate is only 50 Mbps. The customer router can transmit at the physical interface speed, but the provider policer or service edge expects traffic to remain within the committed information rate. Without shaping, bursts leave the customer router at 1 Gbps and can be dropped by the provider, which is especially damaging to voice traffic because drops and jitter create choppy audio. Cisco QoS design commonly uses a parent shaper set to the provider CIR and then applies child queuing policies under that shaped rate. This allows voice and other critical classes to be prioritized before packets are transmitted into the constrained service. A parent policing policy would drop or mark excess traffic locally rather than smoothing bursts.
Reducing physical bandwidth is not normally possible on a provider Ethernet handoff, and the interface bandwidth statement changes routing/QoS reference values but does not enforce the CIR. Therefore, parent shaping is required. Reference topics: hierarchical QoS, traffic shaping, CIR, LLQ, WAN edge QoS.
NEW QUESTION # 159
Drag and drop the characteristics from the left onto the Yang model they describe on the right.
Select and Place:
Answer:
Explanation:
Explanation:
The drag-and-drop mapping is based on how Cisco differentiates YANG model families used for model- driven programmability. IETF models are standards-based and are intended for broad interoperability across vendors. They are the usual choice when the design priority is a consistent baseline for multivendor configuration or operational state. OpenConfig models are also vendor-neutral, but they are developed by the OpenConfig community and often provide an operationally consistent structure for telemetry and configuration across platforms. Cisco native models are vendor-specific models that expose detailed Cisco IOS XE, IOS XR, or NX-OS features, including capabilities that may not be represented in IETF or OpenConfig models. The design choice is therefore not simply "one model is always best." It depends on whether the requirement prioritizes portability, abstraction, or complete Cisco feature coverage. For a standards-driven multivendor design, use IETF or OpenConfig where sufficient. For Cisco-specific device features, use Cisco native models. Reference topics: YANG models, IETF models, OpenConfig, Cisco native models, NETCONF/RESTCONF programmability.
NEW QUESTION # 160
An architect must design a QoS model for a business-critical application that Is delay-sensitive and requires high bandwidth. The company's head office hosts the application, and DMVPN tunnels protected with IPsec provide connectivity between the head office and branches. Which solution must the architect choose?
Answer: C
NEW QUESTION # 161
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