Svchost runs Windows Services, it's not connecting to anything itself per-se. The first sounds like ordinary router/PC communication (DHCP is what assigns your PC an IP address, without which it can't access the internet or be accessed from the internet), the second is the Windows Universal Plug and Play service, it picks up UPNP devices available on a network. You can allow it safely, but it's not needed as a service generally speaking (especially if your PC is not part of a network). To stop the service goto start menu/run, type
Press return, scroll down to Universal Plug and Play, right click it, select Properties, click Stop and set it to Manual or Disabled. Reboot if necessary.