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CCIE Technologies
Enterprise Infrastructure
91 technologies
Configuration
Advanced Policy-Based Routing: The Override That Fails Silently
LAB Topology
Advanced STP and MST Lab: Building, Verifying, and Breaking a Multi-Region Design
LAB Topology
BFD for BGP Fast Failover: Detecting the Failure That Leaves Everything Looking Healthy
Configuration
BGP AS-Path Features: What local-as, allowas-in, as-override and Prepending Actually Cost You
Configuration
BGP AS-Path Filters and Regular Expressions: What the Expression Is Really Matching
Concept
BGP Best Path Selection: Walking All Thirteen Steps and Finding the One That Decided
LAB Topology
BGP Communities Design and Lab: Classify Once at Ingress, Act at Egress, Strip on the Way Out
Concept
BGP Multihoming: Outbound Is a Configuration, Inbound Is a Negotiation
Concept
BGP Path Attributes: How Two Bits in the Flags Byte Explain Most of BGP
Configuration
BGP Route Aggregation: A Claim About Address Space, Not About Destinations
Concept
BGP Route Reflector Design: The Rules, the Clusters, and the Paths Your Clients Never See
Concept
BGP Routing Policies: The Tooling, the Sharp Edges, and the Filter Everyone Forgets
Configuration
BGP Soft Reconfiguration and Route Refresh: Two Answers to One Storage Decision
Concept
Campus Design: Where the Routing Boundary Sits Decides Everything Else
Concept
CCIE EI Design: The Best Network Is Not the Answer, the Traceable One Is
Concept
Cisco Layer 2 Protocols: What CDP, LLDP and UDLD Each Do — and Where Each One Fails
Configuration
Cisco VLAN Technologies: Access Ports, Trunks, and Why the Native VLAN Decides Your Security Posture
Concept
EIGRP DUAL: How Feasible Distance and Advertised Distance Decide Whether You Converge in Milliseconds or Minutes
Concept
EIGRP Metric Calculation: The Formula, the K Values, and Why You Tune Delay Instead of Bandwidth
Configuration
EIGRP Named Mode vs Classic Mode: The Hierarchy, Wide Metrics, and a Migration That Does Not Need a Flag Day
Concept
EIGRP Unequal Cost Load Balancing: Why Variance Is the Weaker of Two Conditions
LAB Topology
EtherChannel and LACP: How Bundling Really Distributes Traffic — and Where It Goes Wrong
LAB Topology
IPv6 Dual Stack: Two Networks Sharing One Cable
Concept
Layer 2 Multicast: Why IGMP Snooping Fails 130 Seconds After Everything Looked Fine
Troubleshooting
Multicast RPF Failures: The Unicast Problem That Only Multicast Notices
LAB Topology
Mutual Route Redistribution Loop Prevention: The Loop Lives in the Routing Table, Not in Either Protocol
Concept
OSPF Areas: Carefully Partitioned, and It Scales Exactly As Badly As Before
LAB Topology
OSPF Authentication: Configuring It Properly, Rotating Keys Without an Outage, and Debugging It When It Fails
Concept
OSPF LSA Types Explained: What Each Type Carries and How to Filter Them
Concept
OSPF Network Types and Area Types: What Each One Changes, and How to Choose
LAB Topology
OSPF Virtual Link and Sham-Link Lab: Repairing a Backbone, Overriding a Preference
Concept
PIM Sparse Mode and the RP: Why the Tree Exists and Nothing Flows
Configuration
Redistribution Between BGP, EIGRP, OSPF and Static: A Translation Problem, Not a Plumbing Problem
Configuration
Route Filtering with BGP, EIGRP, OSPF and Static: Three Protocols, Three Different Answers
Configuration
Route-Map and Prefix-List Advanced Filtering: Three Matches That Look Alike and Select Different Things
LAB Topology
STP Protection Features Lab: PortFast, BPDU Guard, BPDU Filter, Loop Guard and Root Guard — and Where Each One Belongs
Concept
The Fabric Data Plane: Fifty Bytes That Change Everything
Troubleshooting
Troubleshooting OSPF Neighbor Adjacency: The State Is the Diagnosis
Configuration
VRF, VRF-Lite and Route Leaking: The Exceptions That Make Separation Useful
Configuration
Control Plane Policing: The Rates in Every Example Are Wrong for Your Network
Configuration
Device Hardening: Three Defensible Decisions That Together Make a Router Unrecoverable
Configuration
DHCP Snooping, DAI and IP Source Guard: Get the Table Wrong and You Take the Floor Down
Configuration
Embedded Packet Capture: A Counter Says Something Is Wrong, a Capture Says Who
LAB Topology
FHRP Tracking: Why Your Failover Verifies Clean and Never Fires
Configuration
Flexible NetFlow: The Link Is Saturated and the Graph Will Not Know for Thirty Minutes
Configuration
Hierarchical QoS: Zero Drops, Perfect Counters, and Users Who Cannot Hear Each Other
LAB Topology
HSRP and IP SLA: Your Fast Failover Takes a Minute and the Config Looks Perfect
Configuration
HSRP Blackholes: The Gateway Is Answering and Nothing Is Getting Through
Configuration
IPv6 First Hop Security: The Switch Probes a Host and the Host Gives Up on IPv6
Configuration
IPv6 RA Guard: Every Port Filtered, and the Rogue Router Still Wins
Configuration
MACsec: The Interface Is Up, the Config Matches, and Nothing Is Encrypted
Configuration
MQC QoS: The Class With Zero Packets and the Boundary Nobody Defended
Configuration
NAT64: Everything That Breaks Here Never Asked the Name Server
Configuration
NAT: Routing Happens Before Translation One Way and After It the Other
Configuration
Object Tracking: Moving the Route Is the Easy Half of a Circuit Failover
LAB Topology
Port Security: A Count With a Reaction, Not an Identity Control
Configuration
RADIUS for Device Management: The Server Is Down, and Nobody Can Log In Anywhere
Configuration
SLAAC or DHCPv6: The Flags Are Advice, and Some Devices Are Not Listening
Troubleshooting
SPAN: Your Capture Shows Packet Loss That Never Happened
