When you are in the exam settings screen, you can choose to take exams in one of three modes: Study mode enables you to fully customize an exam and review answers as you are taking the exam. This is typically the mode you use first to assess your knowledge and identify information gaps. Practice Exam… Read More »
Priority queuing (PQ) is a queuing method that establishes four interface output queues that serve different priority levels: high, medium, default, and low. Unfortunately, PQ can starve other queues if too much data is in one queue because higher-priority queues must be emptied before lower-priority queues. Custom Queuing Custom queuing (CQ) uses up to 16… Read More »
The SD-Access fabric uses VXLAN encapsulation for the fabric data plane over the top of the underlay network. VXLAN encapsulations are IP/UDP based, using port 4789, which effectively creates the overlay within the SD-Access fabric. VXLAN is an IETF standard defined in RFC 7348 as a way to overlay a Layer 2 network over a… Read More »
Unified policy was a major driver in the SD-Access solution to allow for the same policy to be applied to both wired and wireless networks enforced at the access layer. Segmentation adds to unified policy by enabling VRF instance/VN (macro) and SGT (micro) segmentation to be deployed in the SD-Access fabric. VRF instance/VN segmentation involves… Read More »
The vSmart component resides in the control plane. vSmart controllers provide routing, enforce data plane policies, and enforce network-wide segmentation. Because policies are created on vManage, vSmart is the component responsible for enforcing these policies centrally. It is the “brains” of the architecture. vEdge routers communicate their routing information with the vSmart controllers, not to… Read More »
Cisco IOS XE devices can be onboarded in three different ways: SD-WAN Security Cisco’s SD-WAN solution provides security for the management plane, control plane, and data plane. The control plane uses a Zero Trust model, the management plane uses role-based access control (RBAC) and access control lists (ACLs), and the data plane has integrated on-premises… Read More »
An enterprise designer should consider design options in deploying SD-WAN components to account for scalability, high availability, security, and QoS. Control Plane Design SD-WAN vManage, vSmart, and vBond can be deployed in one of three cloud-delivered control methods. The design option chosen depends on the company’s IT policies on network infrastructure. A company might want… Read More »
Each VPN is independent of every other VPN. You might separate VPNs in order to separate business traffic from guest wireless traffic. Or you might want to separate manufacturing or extranet traffic. Some traffic might be site-to-site traffic, and other traffic might be site-to-data center traffic. VPNs can be configured with several different topologies: Figure… Read More »
Each vEdge interface has eight queues. Of these queues, queue 0 uses LLQ. By default, control and BFD traffic use queue 0. Control and BFD traffic is marked as DSCP 48 decimal. LLQ traffic is transmitted before packets in any of the other queues. The only congestion-avoidance algorithm used for this queue is tail drop,… Read More »
Benefits of Cisco SD-WAN Cloud OnRamp include Cisco SD-WAN Cloud OnRamp Solutions Cisco SD-WAN Cloud OnRamp solutions include Cisco SD-WAN Cloud OnRamp for Multicloud automates and seamlessly connects enterprise networks to the leading public clouds such as Amazon Web Services (AWS), Google Cloud, and Microsoft Azure and other Infrastructure-as-a-Service (IaaS) providers with site-to-cloud connectivity (see… Read More »