问题：
[单选] SGSN gets GGSN’s IP address by communicating to （） when a MS makes PDP context activation.
PAPU。HLR。MS。DNS。
问题：
[单选] Old SGSN can get new SGSN’s IP address by communicating to （） when a MS requests inter_SGSN RA update.
MS。GGSN。DNS。HLR。
问题：
[单选] When does a MS get IP address？（）
After MS finishes GPRS attach。After MS finishes PDP context activate procedure。After MS requests RA update。After MS finishes Cell update。
问题：
[单选] What could a MS do when its state changes from idle to ready？（）
Power on。PDP context activation。GPRS attach。Transferring packets。
问题：
[单选] What can MS do when it is standby state？（）
Transfer data packets。Receive PS or CS paging。Do nothing。Cell update。
问题：
[单选] When a mobile of B class is on the state of standby，what MM information is registered in SGSN？（）
LAI。CI。RAI。None。
问题：
[单选] Which of following interface are not using CCS7 protocol？（）
Gn。Gd。Gs。Gr。
问题：
[单选] Which parameter is usedby GPRST unnelling protocol between GSNs to identify a PDP context？（）
NSAPI。TLLI。SAPI。TEID。
问题：
[单选] Which logical channel is used to send RACH bust on uplink and TAs on downlink？（）
PDTCH。PTCCH。PACCH。PBCCH。
问题：
[单选] Which logical channel is used to transfer signaling messages such as resource reallocation？（）
PDTCH。PTCCH。PACCH。PBCCH。
