O-LevelComputer ScienceThe Internet and its uses2210/11 · May/June 2021 · Q15 Marks
Benedict has a computer that is assigned an Internet Protocol (IP) address. The IP address is: 198.167.214.0 The IP address is represented as denary values.
- (a)Convert the denary values 167 and 214 from the IP address to 8-bit binary. 167 214 Working space[2]
- (b)(i)Identify one similarity between an IP address and a MAC address.[1]
- (b)(ii)Identify two differences between an IP address and a MAC address. Difference 1 Difference 2[2]
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [2] (a) One mark per each correct register. 1 0 1 0 0 1 1 1 1 1 0 1 0 1 1 0
- [1] (b)(i) Any one from: Both addresses can be used to identify a computer/device Both are unique Both can be represented as hexadecimal Both addresses do not change if IP address is static
- [2] (b)(ii) Any two from: An IP address is assigned by the network/router/ISP, A MAC address is assigned by the manufacturer An IP address can be changed (if dynamic), MAC address cannot be changed IP address has 4/8 groups of values, MAC address has 6 groups/pairs of values IP address is 32-bit/128-bit, MAC address is 48-bit IP address does not contain serial number/manufacturer number, MAC address does IP(v4) address is denary and MAC address is hexadecimal
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