Routing & Bandwidth Management Explained — OSPF, BGP, QoS & FHRP (N10-009)

Master CompTIA Network+ N10-009 Objective 2.1 — Explain Characteristics of Routing Technologies and Bandwidth Management Concepts. This lesson covers everything you need for the routing portion of the exam: how routers make forwarding decisions, static vs dynamic routing, the major protocols (RIP, OSPF, EIGRP, BGP), first-hop redundancy, and the QoS techniques that keep voice and video flowing.

With animated routing table, OSPF areas, FHRP, and traffic shaping diagrams, you'll see how routing actually works — not just memorize acronyms.

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📚 WHAT YOU'LL LEARN
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✅ How routers make Layer 3 forwarding decisions
✅ Routing table anatomy + longest prefix match
✅ Static routing · default routes · floating static
✅ Dynamic routing · administrative distance · metrics
✅ Interior protocols: RIP · OSPF · EIGRP
✅ Exterior protocol: BGP (runs the Internet)
✅ ARP — IP to MAC resolution on the LAN
✅ First-Hop Redundancy: HSRP · VRRP · GLBP
✅ QoS: marking (CoS vs DSCP), shaping vs policing, queue types
✅ FIFO · WFQ · LLQ — when to use each

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⏱ CHAPTERS
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0:00 Introduction
0:14 Lesson Overview
0:33 Switch (L2) vs Router (L3)
1:15 The Routing Table — Longest Prefix Match
2:20 Static Routing
3:12 Default & Floating Static Routes
3:58 Dynamic Routing
4:35 Administrative Distance
5:24 Metric Comparison
5:50 RIP — Routing Information Protocol
6:14 OSPF — Open Shortest Path First
6:52 EIGRP — Enhanced IGP
7:25 BGP — Border Gateway Protocol
8:03 IGP vs EGP
8:19 ARP — Address Resolution
8:35 FHRP — HSRP, VRRP, GLBP
9:20 QoS Marking — CoS vs DSCP
10:13 Traffic Shaping vs Policing
10:40 Queuing — FIFO, WFQ, LLQ
11:07 Exam Summary

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🎯 EXAM QUICK REFERENCE
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ADMINISTRATIVE DISTANCE (lower = better)
• 0 Connected
• 1 Static
• 20 eBGP
• 90 EIGRP (internal)
• 110 OSPF
• 120 RIP
• 200 iBGP

ROUTING PROTOCOLS
• RIP — distance-vector, hop count, max 15
• OSPF — link-state, Dijkstra, areas (Area 0 = backbone)
• EIGRP — hybrid, DUAL algorithm, composite metric
• BGP — path-vector, Autonomous Systems, path attributes

FHRP
• HSRP — Cisco proprietary, active/standby
• VRRP — open standard (RFC 5798)
• GLBP — Cisco, load-balances across multiple routers

QoS
• CoS — Layer 2, 3 bits in 802.1Q (values 0–7)
• DSCP — Layer 3, 6 bits in IP ToS (EF, AF classes)
• Shape — buffers/delays excess (smooth bursts)
• Police — drops/re-marks excess (no buffering)
• LLQ — priority queue for voice

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🎓 FULL NETWORK+ N10-009 SERIES
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This is part of the complete CompTIA Network+ N10-009 training series from it-learn.io — structured, visual, exam-focused lessons for every objective.

🔗 Full course: https://network.it-learn.io

Previous lesson → Objective 1.8: Modern Network Environments (SDN, SD-WAN, VXLAN, SASE)
Next up → Objective 2.2: Switching Technologies (VLANs, STP, link aggregation)

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#CompTIA #NetworkPlus #N10009 #Routing #OSPF #BGP #EIGRP #QoS #FHRP #HSRP #NetworkPlusN10009 #CompTIANetworkPlus #ITCertification #ITTraining #Networking

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