Weekly Quiz·Week 19, 2026
Telecom Security Fundamentals
Test your knowledge of mobile network protocols, architecture, and security vulnerabilities — from SS7 to 5G.
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1.What does SS7 stand for?
2.Which SS7 vulnerability allows an attacker with network access to track a subscriber's location?
3.What is the primary function of the HLR (Home Location Register)?
4.In LTE/4G core networks, which protocol replaced SS7 MAP for authentication and subscriber management?
5.What does IMSI stand for, and how many digits does it typically contain?
6.Which interface in 4G LTE connects the MME to the HSS for authentication?
7.What is GTP primarily used for in mobile packet core networks?
8.In the 5G Standalone (SA) architecture, which network function takes over mobility and access management from the 4G MME?
9.What is an IMSI catcher (colloquially called a Stingray)?
10.Which 5G security feature specifically prevents passive IMSI harvesting by IMSI catchers?
11.What does an IPX (IP eXchange) network provide for international roaming?
12.What is the role of the SEPP (Security Edge Protection Proxy) in 5G roaming?
13.In telecom fraud, what is a SIM swap attack?
14.At which layer of the network stack does SIP (Session Initiation Protocol) operate?
15.What is the primary security risk associated with GTP (GPRS Tunneling Protocol)?