MOBINFSEC Logs

Every wireless network is built from four elements: wireless devices, base stations, wireless links, and network infrastructure. * The four elements: device, link, base station, infrastructure. * 1. Wireless Devices (Drahtlose Geräte): The end-user devices: smartphones, laptops...

Quiz: MOBINFSEC / Wireless Communication | updated: Jul 30, 2026

Mobile devices passed a major internet milestone in 2016: they generated more traffic than desktop devices for the first time, at 51.3%. These figures are snapshot statistics from the 2026 learning material. Treat them as evidence for the scale of mobile networking, not as timele...

Quiz: MOBINFSEC / Wireless Communication | updated: Jul 30, 2026

Voice follows the circuit-switched path through MSC to the PSTN; data follows the packet-switched path through SGSN/GGSN to the internet — both start from the same UE and UTRAN. * Voice via Iu-CS to the PSTN, data via Iu-PS to the Internet. * Voice call path (circuit-switched):...

Quiz: MOBINFSEC / UMTS Architecture | updated: Jul 30, 2026

Wireless means communication without cables. Mobility means the device can move while maintaining its connection. These are two separate properties. * The two properties are independent — a device can have either, both, or neither. * Wireless without mobility: A desktop compute...

Quiz: MOBINFSEC / Wireless Communication | updated: Jul 30, 2026

In the cnlab.ch measurement window from October 2024 to September 2025, Swisscom led average 4G/5G downloads, followed by Salt and then Sunrise. Average download speeds (4G+5G combined, cnlab.ch data, October 2024 - September 2025): Operator Avg Download Speed Trend Swissc...

Quiz: MOBINFSEC / Wireless Communication | updated: Jul 30, 2026

Uu (UE↔Node B air interface), Iub (Node B↔RNC), Iur (RNC↔RNC), and Iu (RNC↔Core Network) — together they form the chain from phone to core. * The four UMTS interfaces: Uu, Iub, Iu, and Iur (RNC-RNC). * Walking up the stack from the phone: Interface Connects GSM equivalent...

Quiz: MOBINFSEC / UMTS Architecture | updated: Jul 30, 2026

Infrastructure-based networks rely on base stations that connect devices to a wired backbone. Ad-hoc (mesh) networks have no base stations, and devices organize themselves. * Infrastructure routes via a base station; ad-hoc nodes self-organise. * * Mesh topology: nodes self-org...

Quiz: MOBINFSEC / Wireless Communication | updated: Jul 30, 2026

In that two-month snapshot, NR/NSA connections dominated, with 4G-LTE as the next largest segment. * NSA keeps the 4G core (fast to deploy); SA's new 5G core is what unlocks slicing and ultra-low latency. * Distribution (cnlab.ch, measured over a two-month window in Switzerland)...

Quiz: MOBINFSEC / Wireless Communication | updated: Jul 30, 2026

The UMTS-PLMN (Public Land Mobile Network) is one operator's complete mobile network — it contains both the UTRAN (radio access) and the CN (core) as its two halves. A PLMN is the network run by a single mobile operator (e.g. one national carrier). It is the umbrella term for eve...

Quiz: MOBINFSEC / UMTS Architecture | updated: Jul 30, 2026

Single-hop means the device reaches its destination (or a base station) in one wireless jump. Multi-hop means the signal must pass through intermediate wireless nodes. * The four single-hop / multi-hop x infrastructure combinations. * Single-Hop Multi-Hop Infrastructure-...

Quiz: MOBINFSEC / Wireless Communication | updated: Jul 30, 2026