SLR1.5 – Network topologies – protocols and layers OCR GCSE SLR1.5 Star and mesh network topologies OCR GCSE SLR1.5 WiFi OCR GCSE SLR1.5 Ethernet OCR GCSE SLR1.5 The uses of IP, MAC addressing and Protocols OCR GCSE SLR1.5 The concept of layers OCR GCSE SLR1.5 Packet switching