IGCSE Computer Science Paper 1 Definitions Worksheet: 3.3 Data Storage and 3.4 Network Hardware (Modules 325–341)
Name:
Date:
Class:
✎
Key terms
Write what each term means, in your own words.
1
cloud storage vs local storage
2
point because reason
3
MAC address
4
MAC address set at manufacture
5
00:1A:2B:3C:4D:5E
6
IP address allocation
7
IPv4 address
8
invalid IPv4 address
Answer Key
IGCSE Computer Science Paper 1 · Modules 325–341 · Student wording will vary for definitions
1cloud storage vs local storage — Cloud storage is accessed over the internet from anywhere, but relies on a network and provider. Local storage is on your device: quicker and fully under your control, but less portable.
2point because reason — A full-mark storage answer uses the correct term (e.g. virtual memory, ROM, SSD) and links each point to a reason with 'because', rather than just naming or listing things.
3MAC address — A unique hardware address given to one network interface card (NIC). Each NIC has its own, so a device with Wi-Fi and Ethernet has two. It identifies the hardware, not the network.
4MAC address set at manufacture — A MAC address is set by the manufacturer when the NIC is made and stored in the NIC, so it normally stays the same on any network the device uses.
500:1A:2B:3C:4D:5E — A MAC address is six pairs of hex digits (two digits per pair, 48 bits in total), separated by colons or hyphens, such as 00:1A:2B:3C:4D:5E.
6IP address allocation — A device is given its IP address by the network it joins, not by the manufacturer, so it can change on a new network. Unlike a MAC address, it is not built into the NIC.
7IPv4 address — 32 bits written as four denary numbers from 0 to 255 separated by full stops, such as 190.0.5.20. Each number is a group of 8 bits.
8invalid IPv4 address — An address without exactly four groups, or with a group outside 0 to 255. Examples: 256.1.1.1 (too big), 192.168.1 (too few groups), 10.-5.2.1 (negative) and 10.a.2.1 (letter).