Podcast
Tech Exam Prep
Hosted by Ran Chen, EA, CFP® · EN
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, CompTIA A+, and more. Each 5-minute episode breaks down one exam topic with concrete examples, common exam traps, and memory tricks to help you pass on your first attempt. No fluff, no filler — just the concepts you need to know, explained the way the exam tests them. 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 for everyone. For free practice questions, AI-powered explanations, flashcards, and full study guides, visit https://open-exam-prep.com/ Subscribe and listen daily — your certification is closer than you think.
44episodes
Episodes
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CCNA Exam Prep 42, Default Gateway and Routing Loop Prevention
1w ago00:03:06Tap to summarizeThis 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: - A host uses its default gateway only when the destination IP address is on a different subnet. - The IP header's Time-to-Live (TTL) field is a last-resort mechanism that prevents packets from looping infinitely. - Split Horizon is a loop prevention rule where a router avoids advertising a route back to the neighbor from which it was learned. - Poison Reverse actively prevents loops by advertising a failed route with an infinite metric back to the source router. - An ICMP redirect message is sent by a router to inform a host on the same subnet of a more optimal first-hop router for a specific destination. 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
Transcribe →CCNA Exam Prep 41, VRRP and GLBP vs HSRP
2w ago00:04:00Tap to summarizeThis 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 core difference between redundancy (HSRP/VRRP) and true load balancing (GLBP). - How to identify the Cisco proprietary protocols (HSRP, GLBP) versus the open standard (VRRP). - The specific roles in each protocol: Active/Standby (HSRP), Master/Backup (VRRP), and AVG/AVF (GLBP). - Why GLBP's use of an Active Virtual Gateway to assign virtual MACs enables load sharing. - Common exam scenarios, such as choosing the right protocol for a multi-vendor network. 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
Transcribe →CCNA Exam Prep 40, HSRP Configuration and Verification
2w ago00:03:19Tap to summarizeThis 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 to configure essential HSRP commands like virtual IP, priority, and preemption. - The critical role of the `standby preempt` command in ensuring the highest priority router becomes active. - Using `standby track` to link HSRP failover to the status of an upstream interface, preventing traffic black holes. - How to interpret the output of `show standby brief` to quickly verify HSRP state and identify the active router. - Key exam facts like the default priority of 100 and the HSRPv1 multicast address of 224.0.0.2. 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
Transcribe →CCNA Exam Prep 39, First Hop Redundancy — HSRP States and Roles
2w ago00:03:20Tap to summarizeThis 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: - HSRP elects an Active router based on the highest priority value (0-255), with a default of 100. - Preemption is a critical feature that is disabled by default; without it, a higher-priority router will not reclaim the Active role upon recovery. - HSRP routers transition through states including Listen, Speak, Standby, and Active during the election process. - Interface tracking allows HSRP to decrease a router's priority if a non-HSRP interface fails, triggering a failover. - Default HSRP timers are 3 seconds for hello messages and 10 seconds for the hold-down timer. 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
Transcribe →CCNA Exam Prep 38, OSPF Cost Calculation and Path Selection
2w ago00:02:57Tap to summarizeThis 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 OSPF cost formula is Reference Bandwidth divided by Interface Bandwidth, with lower cumulative costs being preferred. - The default reference bandwidth of 100 Mbps creates a common exam trap, causing links faster than 100 Mbps to have an identical cost of 1. - How to fix the default cost issue network-wide using the `auto-cost reference-bandwidth` command in router configuration mode. - How to manually override the calculated cost for specific path engineering using the `ip ospf cost` command on an interface. - That the reference bandwidth must be set consistently across all routers in the OSPF domain to ensure accurate and predictable path selection. 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
Transcribe →CCNA Exam Prep 37, OSPF Single-Area Configuration
2w ago00:02:58Tap to summarizeThis 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 to enable the OSPF routing process using the `router ospf` command. - The correct structure of the `network` command, with a specific focus on calculating wildcard masks. - The difference between using the global `network` command and interface-specific OSPF configuration. - Key verification commands, such as `show ip ospf neighbor`, and how to interpret their output. - Common CCNA exam traps including mismatched area IDs, incorrect wildcard masks, and passive interfaces. 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
Transcribe →CCNA Exam Prep 36, OSPF Network Types — Broadcast, Point-to-Point
2w ago00:03:35Tap to summarizeThis 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 function of DR/BDR elections on OSPF broadcast networks (like Ethernet) to reduce adjacencies. - How OSPF uses multicast addresses 224.0.0.5 and 224.0.0.6 on broadcast networks. - Why OSPF point-to-point networks do not elect a Designated Router (DR) or Backup Designated Router (BDR). - Common exam traps like mismatched network types or timers preventing OSPF adjacency. - The DR election process: highest OSPF priority, then highest router ID as the tiebreaker. 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
Transcribe →CCNA Exam Prep 35, OSPF DR and BDR Election
2w ago00:03:03Tap to summarizeThis 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 OSPF DR/BDR election only occurs on multi-access networks to reduce LSA flooding. - The router with the highest OSPF interface priority (0-255) wins the DR election; a priority of 0 makes a router ineligible. - The highest router ID is used as the tie-breaker if interface priorities are equal. - The election process is non-preemptive; a new router with a higher priority will not take over an already-elected DR. - DROTHERs form a FULL adjacency with the DR and BDR, but only a 2-WAY state with other DROTHERs. 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
Transcribe →CCNA Exam Prep 34, OSPF Neighbor Adjacency States
3w ago00:02:23Tap to summarizeThis 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 seven OSPF neighbor states in order are Down, Init, 2-Way, ExStart, Exchange, Loading, and Full. - On broadcast networks, non-DR/BDR routers normally remain in the 2-Way state with each other and only reach Full with the DR and BDR. - A common cause for a failed OSPF adjacency is a mismatch in the Hello or Dead timers between neighboring routers. - The ExStart and Exchange states are where routers use Database Descriptor packets to summarize and compare their link-state databases. - A helpful mnemonic for the OSPF states is: "Do Interns 2-way Exchange Extra Large Fries?" 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
Transcribe →CCNA Exam Prep 33, OSPFv2 Fundamentals — LSA Types and Areas
3w ago00:02:55Tap to summarizeThis 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 function of OSPF areas, including the mandatory backbone Area 0, to enhance scalability. - The roles of LSA Type 1 (Router) and LSA Type 2 (Network) and that they are confined within a single area. - How Area Border Routers (ABRs) generate LSA Type 3 (Summary) to advertise routes between different areas. - The critical difference between inter-area routes (learned via Type 3 LSAs) and external routes (learned via Type 5 LSAs). - Common CCNA exam traps, such as confusing the flooding scopes of different LSA types. 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
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