Spirent Communications Investor Presentation — March 2017

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March 2017Spirent Communications plc

2016 Full Year Results2 Spirent Communications PROPRIETARY AND CONFIDENTIALThis presentation andthesubsequent question andanswer session may contain forward -looking

statements that arebased oncurrent expectations orbeliefs, aswell asassumptions about

future events .There areriskfactors thatcould cause ouractual results todiffer materially from

those expressed inorimplied bysuch statements .

Spirent disclaims anyintention orobligation torevise orupdate anyforward -looking statements

that may bemade during thispresentation orthesubsequent question and answer session

regardless ofwhether those statements areaffected asaresult ofnew information, future events

orotherwise .Safe Harbour Statement3 Spirent Communications PROPRIETARY AND CONFIDENTIALAchievements 2016

Market share gain in Ethernet test market; 400G wins

Virtual and Cloud stress test solutions

Positioning test system for vulnerability detection & assessment

New security product (CyberFlood) and service ( SecurityLabs )Networks

WirelessWon deals for active test solutions in the network (Landslide)

Completed analytics system deployment in Latin American operator

Large sale to Tier 1 carrier for 100GbE probes

Wireless test platform (Elevate) for video and audio quality testing

IoT device testing at Tier 1 carrier

New highly -scalable channel emulator (Vertex)4 Spirent Communications PROPRIETARY AND CONFIDENTIALBusiness Review

Undertaken to accelerate progress on strategy

Focus on areas most likely to deliver long -term earnings growth

Sharp focus on target market opportunities that matter most to customers

Achieve synergies in technical and customer offerings, sales reorganisation and

streamlined management structure

Three market focused segments

Networks & Security

Lifecycle Service Assurance

Connected DevicesPaula Bell

Chief Financial Officer

2016 Financial Results6 Spirent Communications PROPRIETARY AND CONFIDENTIALFinancial Summary

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