Level 3 Communications Internet2 Community Design Workshop

1. Level 3 CommunicationsInternet2 Community Design Workshop

2. Level 3: Who We Are • Premier wholesale provider of services over one of the world’s newest and most advanced network platforms • 33,300-mile broadband fiber optic network across the U.S. and Europe • One of the largest Internet backbones in the world • Large and growing number of network routing options • Expanding Metro footprint • 4 metro acquisitions recently announced or closed • Almost 22,000 metro/regional route miles • More than 110 unique metro fiber markets • 5000+ on-net buildings • 14 cable landing stations • Key enabler of VoIP • Local VoIP service covers 93% of U.S. population • E-911 VoIP coverage for 91% of U.S. households within the top 25 metro areas Broomfield Headquarters

3. A World-Class Customer Base • Largest and fastest growing networks rely on Level 3: • Research and academic institutions • Government agencies • Wireless companies • Cable companies • Voice Services Providers • RBOCs, ILECs, and International PTTs • Internet Content Providers • Media and entertainment companies • Customers include: • 9 of the world’s 10 largest telecom providers • Top 10 U.S. ISPs, which serve 70% of all online users • 9 of the 10 largest U.S. cable companies, covering 80% of all cable subscribers in the U.S. • Top 5 wireless service providers in the U.S., with 167 million subscribers

4. What Makes Level 3 Different? • Experience constructing Research and Education networks • Ties to the Education community • Scalability, reach and flexibility: a unique mix • Breadth of solutions • Leader in Waves, Fiber, IP, VoIP, Vyvx and Professional Services • Expanding network footprint • Consistent operational superiority • Customer rankings

5. Backbone LeadershipNation’s Largest Next-Generation Network

6. Backbone Leadership: Scalability • On-going investment in network; even as competitors are scaling back • Deployed new platforms at the DWDM, IP and PL switching layers across entire network during 2005 • Overbuilt the vast majority of the network in less than nine months • 25% capital investment increase in the long-haul network in 2005 over 2004 • Capacity that can scale rapidly to meet demand • IP backbone capacity tripled between Q305 and Q106 • More than 470 Gbps of global peering capacity • Next-gen DWDM enables deployment of larger amounts of bandwidth at one time • Increments of 100 Gbps • Next-gen DWDM provides roadmap to 40 Gbps waves and 10 GigE LAN PHY • Multi-conduit network allows for quick fiber upgrades

7. Backbone Leadership: Reach • Designed from ground up to support IP and cutting edge technologies • 33,000 route miles on long-haul fiber • 22,000 routes miles of metro network • 150 markets - lit long-haul services • 110 markets - lit metro services • Unique network footprint • Extensive existing fiber connectivity with the higher education and research community • High degree of routing diversity • Interconnects to many of the key bandwidth aggregation points and Regional Optical Networks • WilTel footprint acquisition • Reach will grow further with metro/regional acquisitions • Closed: Progress, ICG; announced: Telcove, Looking Glass • Over 5000 buildings with fiber connectivity once acquisitions are complete • Combination of multi-conduit and metro fiber allows for easy and inexpensive interconnection

8. Backbone Leadership: Breadth of Services • Comprehensive portfolio of wholesale backbone services, including: • Wavelengths • Private Line • IP Transit • Dark Fiber • Professional Services • Vyvx - Video Services • Unparalleled experience designing, building and scaling large, backbone networks • Expertise to tailor solutions to meet specific customer needs • True technical experts who know the Level 3 Network’s anatomy precisely • Online access to detailed, geocoded “as-builts” directly from technical experts’ desks — an industry exclusive • Simplicity • Eliminate the need to manage multiple service providers across network layers and services for all locations • Concentrate on core business by leveraging Level 3 to design, build and operate the network

9. Protected Transport Network Availability averaged 100.0000% - April 2006 Transport Protected Network Availability Transport Unprotected Network Availability 100% 100% 99.9964% 99.9997% 99.9993% 100.0000% 100.0000% 100.0000% 100.0000% 100.0000% 100.0000% 100.0000% 100.0000% 100.0000% 100.0000% 99.9981% 99.9999% 99.9999% 99.9999% 99.9762% 99.9954% 99.9473% 99.9904% 99.9888% 99.9459% 99% 99.5665% 99% 98.8773% 98% 98% 98.4020% Unprotected Transport Network Availability averaged above 99.9821% - April 2006 97% 97% 96% 96% Jul-05 Nov-05 Jun-05 Jan-05 Apr-05 Feb-05 Mar-05 Sep-05 Oct-05 Dec-05 Dec-04 Aug-05 May-05 Nov-05 Jul-05 Dec-05 Sep-05 Oct-05 Jan-05 Aug-05 Apr-05 Mar-05 Jun-05 Feb-05 Dec-04 May-05 Backbone Leadership: Performance Consistently ensures a high level of end-user performance • Facilities-based intercity and metro networks • Variety of diversity and protection options • Emphasis on diverse entrance facilities, dual gateway designs and no network spurs • Multi-level security in facilities • Very high availability track record • In the last four years: • Private Line installed base grew 8X (CAGR of 70%) • Wavelength installed base grew 7X [Insert new Level 3 intercity transport map and backhaul map here.] End-to-End Backbone Solutions

10. Backbone Leadership: IP Performance • Best in class on-net latency • Outperform competitors ~ 73% of the time in route by route comparisons1 • Outstanding availability and packet loss • Consistently ranked at or near the top in Keynote statistics • Exceptional global connectivity • According to Renesys, Level 3 customers and peering partners reach more networks than any other provider. 2 • An extraordinary community of content and eyeball customers • Direct, high performance links to the most popular destinations Internet destinations • More than 50% of our traffic stays on-net • We control and can guarantee performance end-to-end • 1 Source: Competitor measurements taken from Keynote and compared route for route with internal Level 3 measurements. • 2 Source: http://www.renesys.com/products_services/market_intel/rankings.html

11. Backbone Leadership: Industry Recognition • 2006 GlobalComm award for Core/Backbone Network Design & Services • 2006 Frost and Sullivan Growth Strategy Leadership Award • 2005 ATLANTIC-ACM U.S. Wholesale Excellence Award • 2005 Internet Telephony Product of the Year Award for E-911 service • 2004 World Communications Award for Best Wholesale Carrier • 2004 Microsoft Service Excellence Award for Quality (Level 3 cited for “business integrity, openness, and emphasis on customer care”) • 2004 Frost & Sullivan Award for Technology Innovation Leadership • 2004 Innovation Award from TMC Labs for wholesale VoIP service • Smithsonian Institution recognition as Level 3 as an IP pioneer

12. NewNet Physical Network Map Seattle 1000 Denny Way Level 3 Pacific Northwest GP 2001 6th Ave Westin Chicago CIC/MREN MERIT BOREAS Internt2 710 Lakeshore Starlight Cambridge NOX 300 Bent St Level 3 Portland Oregon GP 707 SW Washington Qwest Portland 1335 NW Northrop Level 3 Rochester Albany Buffalo Hartford Boise New York 111 8th Level 3 Chicago 111 N Canal Level 3 Detroit New York NYSERNET 32 A of Americas via 1075 Triangle Ct Cleveland TFN 4000 Chester Level 3 Ogden Omaha Philadelphia MAGPI 401 N Broad Level 3 Kansas City GPN 1100 Walnut Level 3 Pittsburgh Pittsburgh GP 143 S 25th Level 3 35mi overlap Sacramento via 1005 N B St 1220 L Indianapolis Indiana 1902 S East St Level 3 Oakland Salt Lake Inter-Mountain GP 572 S DeLong Level 3 Washington MAX 1755 Old Meadow Level 3 San Francisco Cincinnati San Francisco Denver Front Range GP 1850 Pearl Level 3 Sunnyvale CENIC 1380 Kifer Level 3 Tulsa OneNet 18 W Archer Level 3 Charlotte Raleigh NCREN 5301 Departure Dr Level 3 Los Angeles 818 W 7th Level 3 Nashville Tennessee GP 2990 Sidco Dr Level 3 Atlanta SLR 56 Marietta 10 Albuquerque New Mexico GP 104 Gold Ave SE Level 3 Santa Barbara Atlanta 345 Courtland Los Angeles CENIC 600 W 7th Equinix San Diego Birmingham Jacksonville FLR 4814 Phillips Hwy Level 3 Dallas El Paso 501 W Overland Level 3 Austin Tallahassee New Orleans Orlando Baton Rouge LONI 9987 Burbank Level 3 I2 100G Wave Facility RON-Core Connector I2 Core Node RON Hub Other Level 3 San Antonio Tampa Houston LEARN 1201 N I-45 Level 3 Miami South Florida GP 45 NW 5th Level 3 Wave paths are meant to represent actual physical routing. Paths which are not shown as parallel and adjacent are meant to be physically diverse.

13. South DLM (layer 3) South DLM (layer 4) Degree 3 Node: Chassis Diversity for High Availability BMM- band mux and optical amplifier for 400Gbps Shelf 1 (Main Chassis w/ redundant MCM) Shelf 4 (Expansion Chassis) Shelf 5 (Expansion Chassis) 1 2 4 5 6 7 1 2 4 5 6 7 1 2 4 5 6 7 3 3 3 West-facing BMM South-facing BMM MCM MCM MCM East-facing BMM Leave Slots 3-6 Empty Leave Slots 3-6 Empty Leave Slots 3-6 Empty MCM Channel: OC-192 or, 10GigE LAN PHY Shelf 2 (Expansion Chassis) Shelf 3 (Expansion Chassis) Shelf 6 (Expansion Chassis) Shelf 7 (Expansion Chassis) 1 2 4 5 6 7 1 2 4 5 6 7 1 2 4 5 6 7 1 2 4 5 6 7 3 3 3 3 South DLM (layer 1) MCM South DLM (layer 2) MCM MCM East DLM (layer 4) MCM West DLM (layer 1) East DLM (layer 1) East DLM (layer 2) West DLM (layer 2) West DLM (layer 3) East DLM (layer 3) West DLM (layer 4) Channels 1-10 Channels 11-20 Channels 21-30 Channels 31-40

14. Transport Network — Availability • Protected Transport Network Availability averaged 100.0000% April 2006 • Unprotected Transport Network Availability consistently averages above 99.9821% in April 2006