All topics › Edexcel GCSE Computer Science › The internet: IP addressing and routers4.1.3 The internet: IP addressing and routersEdexcel GCSE Computer Science (1CP2) · Networks › Networks
Practise The internet: IP addressing and routers. 12 exam-style questions on this subtopic, at up to four difficulty levels, with full mark schemes and a progress tracker. Free, no account needed.
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Define the term 'internet'. A worldwide network of interconnected networks.
State the number of bits in an IPv4 address. 32 bits
State the largest value that any one of the four numbers in an IPv4 address can have. 255 Sample questions Written for this site in the style of Edexcel exam questions. They are not taken from real past papers.
Question 1 Easy 3 marks
(a) Define the term 'internet'.[1]
(b) Identify the valid IPv4 address.[1]
192.168.1.256 172.16.40.25 10.0.300.1 192.168.1 (c) State the purpose of an IP address.[1]
Show the answer and mark scheme (a) Answer: A worldwide network of interconnected networks.
a global network of interconnected networks / a worldwide WAN made up of many connected networks (b) Answer: 172.16.40.25
(c) Answer: It identifies a device on the internet, so that data can be delivered to it.
to identify a device on a network / on the internet, so that data can be sent to the correct device Question 2 Medium 4 marks
A laptop on a home network has the IPv4 address 192.168.10.37.
(a) Convert the first number in the address, 192, to 8-bit binary.[1]
(b) Explain why each of the four numbers in an IPv4 address must be between 0 and 255.[2]
(c) State the number of different IPv4 addresses that are possible. You may give your answer as a power of 2.[1]
Show the answer and mark scheme (b) Answer: The 32 bits are split into four 8-bit groups, and 8 bits can only store 0 to 255.
an IPv4 address is 32 bits long, split into four groups of 8 bits 8 bits can only represent 256 different values, 0 to 255 (c) Answer: 2
32 (4,294,967,296)
232 / 4,294,967,296 / about 4.3 billion Question 3 Hard 5 marks
A computer stores each IPv4 address as a 32-bit binary number.
(a) Convert the IPv4 address 172.16.5.200 into 32-bit binary. Write each group of 8 bits separately.[2]
(b) Convert this 32-bit address into the usual IPv4 format of four denary numbers separated by dots.1100 0000 1010 1000 0000 0001 0000 1010 [1]
(c) Explain why 10.1.300.37 is not a valid IPv4 address.[2]
Show the answer and mark scheme (a) Answer: 1010 1100 . 0001 0000 . 0000 0101 . 1100 1000
first two groups correct: 1010 1100 and 0001 0000 last two groups correct: 0000 0101 and 1100 1000 (c) Answer: 300 is more than 255, so it cannot be stored in the 8 bits available for each part of the address.
300 is greater than 255 each part of an IPv4 address is stored in 8 bits, but 300 needs more than 8 bits (1 0010 1100) Related subtopics
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