Free Cisco 600-212 Exam Practice Questions & Explanations
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A subscriber ports their mobile number from Operator A to Operator B while keeping the same MSISDN. When another subscriber places a call to this ported number, the originating network must determine the correct routing information before the call can be delivered to Operator B. Which function performs this MNP lookup so the call can be routed correctly?
Mobile Number Portability relies on an intelligent network (IN) architecture where the originating switch triggers a query to a Number Portability Database (NPDB), typically accessed via a Service Control Point (SCP), to determine the correct routing number (RN) or the identity of the current serving network for the ported MSISDN. The HSS stores subscriber profile and location data for its own subscribers but is not the authoritative source for portability routing across operators. The PCRF handles policy and charging, and the S-GW handles user-plane forwarding; neither participates in number portability lookups.
An operator wants subscribers to access the EPC over a trusted WiFi network without requiring an IPsec tunnel, while still authenticating through the 3GPP AAA infrastructure and receiving the same policy treatment as cellular access. This scenario describes interworking via the S2a interface using a Trusted WLAN Access Gateway (TWAG), rather than the ePDG-based S2b interface used for untrusted access.
True. For non-3GPP access interworking, trusted WLAN access uses the S2a interface through a Trusted WLAN Access Gateway (TWAG), which does not require IPsec tunneling because the network trust relationship is already established. Untrusted non-3GPP access (such as public WiFi) uses the S2b interface via an ePDG, which mandates IPsec tunnels for secure connectivity to the PGW. Since the scenario specifies a trusted network without IPsec, S2a/TWAG is correct.
An operator is deploying Voice over LTE (VoLTE) but wants subscribers who move into an area with no LTE coverage to seamlessly continue their voice call over the legacy 3G/2G network using SRVCC. During this handover, which network function anchors the call and coordinates the handover to the circuit-switched domain?
Single Radio Voice Call Continuity (SRVCC) relies on the MME detecting the need for handover and signaling the target MSC Server over the Sv interface to prepare the circuit-switched resources, while the IMS network anchors the call via the ATCF/ATGW for continuity. The P-CSCF handles SIP signaling in the IMS core but does not coordinate the actual radio/domain handover. The PCRF manages policy rules, not handover signaling. The S-GW forwards user-plane traffic but does not control the SRVCC handover procedure.
A subscriber powers on an LTE device for the first time on a new operator's network. The UE must attach to the EPC, establish a default bearer, and receive an IP address before any data session can begin. During this Initial Attach procedure, which network element is responsible for selecting the Serving Gateway and PDN Gateway for the UE?
The MME (Mobility Management Entity) handles the control-plane signaling for attach and session management procedures. It authenticates the subscriber via the HSS, then selects the appropriate Serving Gateway (SGW) and PDN Gateway (PGW) based on APN configuration and network topology, and initiates the Create Session Request. The eNodeB only handles radio access signaling relay, the HSS stores subscriber profiles but does not select gateways, and the PCRF provides policy and charging rules after the session is established, not gateway selection.