Tech Exam Prep

Tech Exam Prep

By Ran Chen, EA, CFP®EducationHow ToCourses
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Tech Exam Prep episodes

  • CCNA Exam Prep 26, Cisco DNA Center / Catalyst Center Overview
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.
    In this episode you will learn:
    - Cisco DNA Center (Catalyst Center) acts as a centralized controller, replacing device-by-device CLI management with automation.
    - Intent-based networking allows you to define business outcomes (the 'what'), which DNA Center then translates into network configurations (the 'how').
    - The underlay is the physical network providing basic connectivity, while the overlay is the virtual network (using VXLAN) that enforces policy in SD-Access.
    - DNA Center Assurance provides analytics and AI-driven insights to proactively monitor network health and accelerate troubleshooting.
    - Northbound APIs are used for integration, allowing external IT systems to programmatically interact with the network via DNA Center.
    For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
    4 min
  • CCNA Exam Prep 25, WLAN Configuration — SSID, Security, QoS
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.
    In this episode you will learn:
    - The critical difference between WPA2-Personal (PSK) and WPA2-Enterprise (802.1X/AAA).
    - How to map Cisco's QoS profiles (Platinum, Gold, Silver, Bronze) to specific traffic types like voice and video.
    - The function of mapping a WLAN to a VLAN interface and how it's tested in troubleshooting scenarios.
    - Key security improvements in WPA3, such as Simultaneous Authentication of Equals (SAE).
    - Common exam traps, such as confusing SSID broadcasting with a real security measure.
    For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
    4 min
  • CCNA Exam Prep 24, WLC Discovery and AP Modes
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.
    In this episode you will learn:
    - The four primary methods a lightweight AP uses to discover a WLC: DHCP Option 43, DNS, broadcast, and static configuration.
    - How Local mode serves clients while Monitor mode acts as a dedicated security and RF sensor.
    - The key distinction between Monitor mode (for security) and Sniffer mode (for packet capture and troubleshooting).
    - Why FlexConnect is the essential AP mode for remote offices to ensure survivability during WAN outages.
    - The specific function of Rogue Detector, Bridge, and Mesh modes and their use cases in exam scenarios.
    For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
    4 min
  • CCNA Exam Prep 23, Wireless LAN Architectures — Autonomous vs Lightweight
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.
    In this episode you will learn:
    - Autonomous APs are standalone devices configured individually, best for small-scale deployments.
    - Lightweight APs work with a Wireless LAN Controller (WLC) in a Split-MAC architecture to centralize network management.
    - Communication between a Lightweight AP and a WLC uses a CAPWAP tunnel, with a mandatorily encrypted control plane.
    - Centralized deployments tunnel all client data to the WLC, which can be inefficient for remote offices.
    - FlexConnect mode allows branch office APs to switch data traffic locally, saving WAN bandwidth and providing resilience during WAN failures.
    For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
    4 min
  • CCNA Exam Prep 22, STP Protections — PortFast, BPDU Guard, Root Guard
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.
    In this episode you will learn:
    - Enable PortFast on access-layer ports connected to end devices to bypass STP's Listening and Learning states for immediate network access.
    - Always pair PortFast with BPDU Guard, which places a port into an `err-disabled` state if it receives any BPDU, preventing unauthorized switches from disrupting the STP topology.
    - Use Root Guard on designated ports facing other switches to prevent a new switch from illegitimately taking over the root bridge role.
    - Root Guard places a port in a `root-inconsistent` state upon receiving a superior BPDU, blocking traffic without shutting down the port.
    - Differentiate BPDU Guard, which protects edge ports from any switch connection, from Root Guard, which protects the core STP hierarchy from superior BPDUs.
    For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
    4 min
  • CCNA Exam Prep 21, Rapid PVST+ Port Roles and States
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.
    In this episode you will learn:
    - The four port roles in Rapid PVST+: Root, Designated, Alternate, and Backup.
    - The three simplified port states in RSTP: Discarding, Learning, and Forwarding.
    - How the Alternate port provides a fast-converging backup path to the root bridge.
    - The specific difference between an Alternate port (backup to the root) and a Backup port (backup to a segment).
    - How Edge Ports immediately transition to forwarding, similar to the classic PortFast feature.
    For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
    3 min
  • CCNA Exam Prep 20, Spanning Tree Protocol Fundamentals
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.
    In this episode you will learn:
    - STP's primary function is to prevent Layer 2 loops by logically blocking redundant switch ports.
    - The root bridge is elected based on the lowest Bridge ID (BID), which is a combination of a priority value and the switch's MAC address.
    - Cisco's Per-VLAN Spanning Tree Plus (PVST+) runs a separate STP instance for each VLAN, enabling traffic load balancing.
    - STP ports transition through five states: Disabled, Blocking, Listening, Learning, and Forwarding.
    - Bridge Protocol Data Units (BPDUs) are the control messages used by switches to share topology information and elect the root bridge.
    For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
    4 min
  • CCNA Exam Prep 19, EtherChannel — LACP, PAgP, Static
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.
    In this episode you will learn:
    - LACP is the open standard (802.3ad) using Active/Passive modes; at least one side must be Active to form a channel.
    - PAgP is Cisco-proprietary, using Desirable/Auto modes; at least one side must be Desirable for a channel to form.
    - The Static 'On' mode uses no negotiation and poses a risk of Layer 2 loops if misconfigured on one side.
    - All physical ports in an EtherChannel bundle must have identical configurations for speed, duplex, and VLAN settings.
    - LACP and PAgP are not interoperable; you cannot form a channel between a switch running PAgP and one running LACP.
    For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
    5 min
  • CCNA Exam Prep 18, Inter-VLAN Routing — ROAS and SVI
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.
    In this episode you will learn:
    - ROAS uses a router with subinterfaces and the `encapsulation dot1q` command to route between VLANs over a single trunk link.
    - SVI uses a Layer 3 switch's internal routing capabilities by creating virtual interfaces (`interface Vlan`) that act as default gateways.
    - A common CCNA exam trap for ROAS is attempting to assign an IP address to a subinterface before specifying the 802.1Q encapsulation.
    - For an SVI to be active, the `ip routing` command must be enabled globally, the VLAN must exist with an active port, and the interface must not be shut down.
    - SVIs offer superior performance to ROAS because routing is handled in hardware, avoiding the bottleneck of an external router link.
    For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
    3 min
  • CCNA Exam Prep 17, Voice VLANs and CDP/LLDP Discovery
    This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.
    In this episode you will learn:
    - How Voice VLANs separate and prioritize voice traffic from data on a single switch port.
    - The function of the `switchport voice vlan` command in assigning an IP phone to its specific VLAN.
    - The role of CDP, a Cisco-proprietary protocol, in automatically informing an IP phone about the correct voice VLAN ID.
    - The key differences between CDP and the open-standard LLDP (802.1AB) for multi-vendor device discovery.
    - Common CCNA exam traps, including troubleshooting non-Cisco phones and misconfigurations between discovery protocols and VLANs.
    For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
    4 min

About Tech Exam Prep

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Tech Exam Prep is a free, daily podcast by OpenExamPrep covering the most in-demand IT and technology certification exams — including CompTIA Security+, AWS Cloud Practitioner, CompTIA Network+, CCNA,…