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CenturyLink HCS Platform Architecture                                                                                                Key

                                                                 MPLS                                                               External
                                                                                                                                    Customer Specific
CenturyLink Data Center                                          Tenant                Tenant
Highlands Ranch, CO                                              Edge/                 Edge/                      CenturyLink Data Center
9180 Commerce Center Cir                                         WAN                   WAN                        Elk Grove Village, IL
                                                                                                                  2425 Busse Rd (CHI 3)
                Services
                                                                                                                          Services
                       ASA
                      5585-X                                                                                                   ASA
                                                                                                                             5585-X

Aggregation                                                              HCS Platform                               Aggregation

    Nexus                                                                                                                 Nexus
     7000                                                                                                                  7000

                               Nexus                             SAN/                      SAN/                   Nexus
                               5548                              NAS                       NAS                    5548
                  ICS
                               UCS                        UCS    Nexus                     Nexus           UCS                ICS
               Virtual 6248                               B200   1000v                     1000v           B200   UCS
               Access / FI                                blade                                            blade  6248 Virtual
                                                                                                                    FI Access /
              Compute                                       s                                                s
                                                                                                                          Compute
   25
                                                                 Platform Dual Connectivity OWS – One GIG
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