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Leaf-Spine vs Three-Tier: Choosing a Data Center Design

Leaf-Spine vs Three-Tier: Choosing a Data Center Design

Two-tier spine-leaf and three-tier core-aggregation-access compared on latency, convergence, cabling cost and oversubscription for east-west traffic.

admin admin 2026-10-12
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Ethernet CFM 802.1ag: Service OAM Configuration Guide

Ethernet CFM 802.1ag: Service OAM Configuration Guide

How Ethernet CFM (IEEE 802.1ag) maintenance domains, MEPs and MIPs work, with Cisco and Juniper CLI examples for continuity check, loopback and linktr

admin admin 2026-10-06
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PTP Boundary Clock vs Transparent Clock Explained

PTP Boundary Clock vs Transparent Clock Explained

IEEE 1588 PTP explained: ordinary, boundary and transparent clocks, why boundary clocks stop jitter accumulation, and what to configure on switches.

admin admin 2026-10-03
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Switch ASICs: Trident, Tomahawk and Silicon One

Switch ASICs: Trident, Tomahawk and Silicon One

What decides switch behaviour when the ports look identical: Broadcom Trident and Tomahawk versus Cisco Silicon One, buffer depth, programmability and

admin admin 2026-10-02
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Microbursts and Switch Buffer Sizing in the Data Center

Microbursts and Switch Buffer Sizing in the Data Center

Microbursts explained: millisecond congestion, why average utilisation hides them, how shared buffers behave under contention, and what to tune.

admin admin 2026-10-02
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Catalyst 9300 StackWise Virtual Dual-Active Detection

Catalyst 9300 StackWise Virtual Dual-Active Detection

StackWise Virtual on Catalyst 9300 and 9600: how the virtual switch link works, why dual-active detection is mandatory, and the configuration steps.

admin admin 2026-10-02
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iPerf3 Throughput Testing: A Repeatable Methodology

iPerf3 Throughput Testing: A Repeatable Methodology

Run iperf3 properly: server setup, window sizing, parallel streams, omit slow start, reverse mode, UDP tests and the traps that produce wrong numbers.

admin admin 2026-10-02
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ARP Spoofing in the Enterprise: Detection and Prevention

ARP Spoofing in the Enterprise: Detection and Prevention

How ARP spoofing enables man-in-the-middle attacks, how Dynamic ARP Inspection validates ARP against the DHCP snooping database, and how to deploy it.

admin admin 2026-10-02
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VLAN Hopping: Double Tagging and Switch Spoofing

VLAN Hopping: Double Tagging and Switch Spoofing

How VLAN hopping works: double tagging and switch spoofing attacks explained, why native VLANs and DTP make them possible, and the hardening steps.

admin admin 2026-10-02
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EtherChannel and LACP Hashing: Why One Flow Fills One Link

EtherChannel and LACP Hashing: Why One Flow Fills One Link

How EtherChannel and LACP hashing works: the inputs used, why a single flow stays on one member link, and how to pick and verify a hash algorithm.

admin admin 2026-10-02
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