Category Archives: Exams of Cisco 300-420

Pearson Cert Practice Test Engine and Questions on the Website – Final Preparation

Register this book to get access to the Pearson IT Certification test engine (software that displays and grades a set of exam-realistic multiple-choice questions). Using the Pearson Cert Practice Test Engine, you can either study by going through the questions in Study mode or take a simulated (timed) 300-420 CCNP Designing Cisco Enterprise Networks ENSLD… Read More »

About Possible Exam Updates – CCNP Enterprise Design ENSLD 300-420 Official Cert Guide Exam Updates

Cisco introduced CCNA and CCNP in 1998. For the first 25 years of those certification tracks, Cisco updated the exams on average every 3–4 years. However, Cisco did not pre-announce the exam changes, so exam changes felt very sudden. Usually, a new exam would be announced, with new exam topics, giving you 3–6 months before… Read More »

Priority Queuing – WAN Availability and QoS

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 »

Very Small Site Design Considerations – SD-Access Design

In very small sites, high availability and site survivability requirements are not common. Shared services are present in all reference designs for DHCP, DNS, WLC, and ISE. These services can be deployed in a remote data center and connected to the fabric through a fusion router, or they can be deployed locally with direct connections.… Read More »

Link Efficiency – WAN Availability and QoS

With Cisco IOS, several link-efficiency mechanisms are available. Link fragmentation and interleaving (LFI), Multilink PPP (MLP), and Real-Time Transport Protocol (RTP) header compression can provide for more efficient use of bandwidth. Table 9-8 describes Cisco IOS link-efficiency mechanisms. Table 9-8 Link-Efficiency Mechanisms Mechanisms Description Link fragmentation and interleaving (LFI) Reduces delay and jitter on slower-speed… Read More »

SD-Access Architecture – SD-Access Design

Cisco Software-Defined Access (SD-Access) is an intent-based networking solution for the enterprise that is built on the foundation of Cisco Digital Network Architecture (DNA). The SD-Access solution provides automated end-to-end segmentation for users and devices from the edge of the network to applications. SD-Access leverages Cisco DNA Center to provide the design settings, policy definition,… Read More »