1. Level 3 Communications Internet2 Community Design Workshop

2.  2006 Level 3 Communications, Inc. All Rights Reserved. 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.  2006 Level 3 Communications, Inc. All Rights Reserved. 3 A World-Class Customer Base  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 Largest and fastest growing networks rely on Level 3:

4.  2006 Level 3 Communications, Inc. All Rights Reserved. 4 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 What Makes Level 3 Different?

5.  2006 Level 3 Communications, Inc. All Rights Reserved. 5 Backbone Leadership Nation’s Largest Next-Generation Network

6.  2006 Level 3 Communications, Inc. All Rights Reserved. 6 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 Backbone Leadership: Scalability

7.  2006 Level 3 Communications, Inc. All Rights Reserved. 7 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 Backbone Leadership: Reach

8.  2006 Level 3 Communications, Inc. All Rights Reserved. 8 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 Backbone Leadership: Breadth of Services

9.  2006 Level 3 Communications, Inc. All Rights Reserved. 9 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 Transport Protected Network Availability 100.0000% 99.9993% 99.9997% 100.0000% 99.9964% 100.0000% 96% 97% 98% 99% 100% Dec-04 Jan-05 Feb-05 Mar-05 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05 Nov-05 Dec-05 Protected Transport Network Availability averaged 100.0000% - April 2006 Transport Unprotected Network Availability 99.9981% 98.4020% 99.9999% 99.9762% 99.9473% 98.8773% 99.9954% 99.9888% 99.5665% 99.9459% 99.9904% 99.9999% 96% 97% 98% 99% 100% Dec-04 Jan-05 Feb-05 Mar-05 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05 Nov-05 Dec-05 Unprotected Transport Network Availability averaged above 99.9821% - April 2006

10.  2006 Level 3 Communications, Inc. All Rights Reserved. 10 Backbone Leadership: IP Performance Best in class on-net latency  Outperform competitors ~ 73% of the time in route by route comparisons 1 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.  2006 Level 3 Communications, Inc. All Rights Reserved. 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.  2006 Level 3 Communications, Inc. All Rights Reserved. 12 NewNet Physical Network Map I2 100G Wave Facility RON-Core Connector I2 Core Node RON Hub Other 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. Denver Front Range GP 1850 Pearl Level 3 Kansas City GPN 1100 Walnut Level 3 Seattle 1000 Denny Way Level 3 Portland 1335 NW Northrop Level 3 Sunnyvale CENIC 1380 Kifer Level 3 Pacific Northwest GP 2001 6 th Ave Westin San Diego Portland Oregon GP 707 SW Washington Qwest San Francisco Oakland Sacramento Los Angeles CENIC 600 W 7th Equinix Santa Barbara Los Angeles 818 W 7 th Level 3 Salt Lake Inter-Mountain GP 572 S DeLong Level 3 Albuquerque New Mexico GP 104 Gold Ave SE Level 3 Tulsa OneNet 18 W Archer Level 3 Houston LEARN 1201 N I-45 Level 3 Dallas San Antonio Baton Rouge LONI 9987 Burbank Level 3 New Orleans Chicago 111 N Canal Level 3 Detroit Chicago CIC/MREN MERIT BOREAS Internt2 710 Lakeshore Starlight Atlanta 345 Courtland Tallahassee Birmingham Atlanta SLR 56 Marietta Charlotte Raleigh NCREN 5301 Departure Dr Level 3 Pittsburgh Pittsburgh GP 143 S 25th Level 3 Washington MAX 1755 Old Meadow Level 3 Philadelphia MAGPI 401 N Broad Level 3 New York NYSERNET 32 A of Americas New York 111 8 th Level 3 Cambridge NOX 300 Bent St Level 3 Tampa Miami South Florida GP 45 NW 5th Level 3 Orlando Jacksonville FLR 4814 Phillips Hwy Level 3 Indianapolis Indiana 1902 S East St Level 3 Hartford Rochester Buffalo Cincinnati via 1005 N B St via 1075 Triangle Ct El Paso 501 W Overland Level 3 35mi overlap Nashville Tennessee GP 2990 Sidco Dr Level 3 Cleveland TFN 4000 Chester Level 3 1220 L Albany 10 Ogden Boise Omaha Austin

13.  2006 Level 3 Communications, Inc. All Rights Reserved. 13 Degree 3 Node: Chassis Diversity for High Availability MCM 12 3 4567 East DLM (layer 2) MCM West DLM (layer 2) 12 3 4567 West-facing BMM MCM 12 3 4567 West DLM (layer 1) MCM East DLM (layer 1) 12 3 4567 Shelf 1 (Main Chassis w/ redundant MCM) Shelf 3 (Expansion Chassis)Shelf 2 (Expansion Chassis) Shelf 4 (Expansion Chassis) East-facing BMM Leave Slots 3-6 Empty Leave Slots 3-6 Empty South DLM (layer 2)South DLM (layer 1)East DLM (layer 4) MCM West DLM (layer 4) 12 3 4567 South-facing BMM MCM 12 3 4567 West DLM (layer 3) MCM East DLM (layer 3) 12 3 4567 Shelf 5 (Expansion Chassis) Shelf 6 (Expansion Chassis) Leave Slots 3-6 Empty South DLM (layer 4)South DLM (layer 3) Shelf 7 (Expansion Chassis) BMM- band mux and optical amplifier for 400Gbps Channels 1-10 Channels 11-20Channels 21-30Channels 31-40 Channel: OC-192 or, 10GigE LAN PHY

14.  2006 Level 3 Communications, Inc. All Rights Reserved. 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