Spirent Communications Investor Presentation — March 2019

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Spirent Communications plc

2018 Full Year Results

PROPRIETARY AND CONFIDENTIAL 2

Safe Harbour Statement

Thispresentation and thesubsequent question and answer session may contain

forward -looking statements thatarebased oncurrent expectations orbeliefs, aswell

asassumptions about future events .There areriskfactors that could cause our

actual results todiffer materially from those expressed inorimplied bysuch

Spirent disclaims anyintention orobligation torevise orupdate anyforward -looking

statements thatmay bemade during thispresentation orthesubsequent question

andanswer session regardless ofwhether those statements areaffected asaresult

ofnew information, future events orotherwise .PROPRIETARY AND CONFIDENTIAL 3Delivering Against Our Strategic Priorities

Sharp focus on target markets

Strong financial and

operational platformHighlights

•Demand increased for 400G Ethernet test

•Expanded enterprise and government security wins

•5G development wins

•VisionWorks expanded in all current customers plus three new customers

•Market leadership for 100G and 400G Ethernet testing

•National Instruments collaboration

•Key Account Executives drive new business opportunities

•Portfolio delivering revenue growth with improved operating margin

•Superior EPS growth

•Effective investment decisions

•Strong balance sheet2018 Full Year

Chief Financial OfficerPROPRIETARY AND CONFIDENTIAL 5Revenue

Change in revenue, adjusted operating profit and adjusted operating margin relate to ongoing businesses i.e. excluding divest ments made in 2017

(1) Before exceptional items, acquired intangible asset amortisation and share -based payment

(2) Adjusted operating profit as a percentage of revenue

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