← IGCSE Computer Science Paper 1

Static IP address

An IP address that is set once, usually by hand, and stays the same every time the device connects, so the device always has a predictable address.

Part of: IGCSE Computer Science 0478 — 3.4 Network Hardware — Module 20, ACARA Digital Technologies Years 9–10 — Networked Systems and Access Control — Module 20, WA Computer Science ATAR Year 11 — Network Communications — Module 43

Understanding Static IP address in IGCSE Computer Science Paper 1

What it does: The same address appears on both days, showing that a static IP address stays the same every time the device connects. Choosing Manual and typing in the address is how a static IP address is set once by hand. A server needs a predictable address so other devices can always find it. A visitor's phone can use any address. A static address does not change, so the printer keeps 192.168.1.50 after a restart.

Common mistakes: A static IP address is set manually by a person, not automatically by the network. Line 4 should be setBy ← "manual". An address that is set once and kept is a static IP address, not a dynamic one. Line 2 should be type ← "static".

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This module's key terms are also in a printable crossword (Modules 342–354) and word search (Modules 325–354).

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Learning

Duo

A static IP address changes every time the device connects to the network.

FalseTrue

Matches

A static IP address changes each time the device connects

↓

This describes a dynamic IP address. A static IP address stays the same every time the device connects.

Applying

Meanings

Term

static IP address

Meaning

An IP address that is set once, usually by hand, and stays the same every time the device connects, so the device always has a predictable address.

Practice

device ← "Printer"

Testing

Gaps

ipAddress

Check Answer

Spots

3type ← "static"

4setBy ← "automatic"

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Quick Questions

1. A static IP address changes every time the device connects to the network.

A. True

B. False ✓

A static IP address is set once and stays the same every time the device connects. It does not change.

2. Which describes how a static IP address is usually set?

A. Set manually by a person ✓

B. Handed out by the network each time

A static address is usually typed in by hand. Addresses handed out automatically each time are dynamic.

3. Which device is most likely to need a static IP address?

A. A web server that must always be found at the same address ✓

B. A visitor's phone joining the school Wi-Fi for an hour

A server needs a predictable address so other devices can always find it. A visitor's phone can use any address.

4. A printer has the static IP address 192.168.1.50. After a restart, what is its address?

A. 192.168.1.50 ✓

B. A new, different address

A static address does not change, so the printer keeps 192.168.1.50 after a restart.

5. Which is a benefit of a static IP address?

A. The address is different each day

B. The address is predictable ✓

The main benefit of a static address is that it is predictable. You always know what it will be.

Match the Pairs

static IP address → An IP address that is set once, usually by hand, and stays the same every time the device connects

IP address: 192.168.1.50 (set manually) → A static IP address that was typed in by hand and gives the device a predictable address

A static IP address does not change when the device disconnects and reconnects → Monday: 192.168.1.50, Tuesday: 192.168.1.50

A static IP address is set manually by a person, not given out automatically → Network settings: Manual, IP = 192.168.1.50

A static IP address changes each time the device connects → This describes a dynamic IP address. A static IP address stays the same every time the device connects.

A static IP address is given out automatically by the network each time → A static IP address is usually set manually and then kept. Automatic allocation that can change each time is a dynamic IP address.

Key Term

static IP address

An IP address that is set once, usually by hand, and stays the same every time the device connects, so the device always has a predictable address.

Fill in the Blanks

1. INPUT ipAddress

Hint: Type the keyword that reads in a value typed by hand, like an address set manually.

2. IF ipMode = "static" THEN

Hint: Type the keyword that follows the condition, before the code that runs when it is true.

3. ipAddress ← "192.168.1.20" OUTPUT ipAddress

Hint: Type the variable name that holds the address set on the first line.

4. ipMode ← "static" IF ipMode = "static" THEN OUTPUT "Address never changes"

Hint: Type the comparison operator that checks whether the mode equals the text.

5. IF ipMode = "static" THEN OUTPUT "Same address" ENDIF

Hint: Type the keyword that closes the selection block.

Spot the Error

Question 1

A device ← "Printer"

B ip ← "192.168.1.50"

C type ← "static"

D setBy ← "automatic"

Line D — A static IP address is set manually by a person, not automatically by the network. Line 4 should be setBy ← "manual".

Question 2

A ip ← "10.0.0.20"

B type ← "dynamic"

C OUTPUT ip

Line B — An address that is set once and kept is a static IP address, not a dynamic one. Line 2 should be type ← "static".

Question 3

A ip ← "192.168.0.5"

B FOR day ← 1 TO 3

C CONNECT(server)

D ip ← GET_NEW_ADDRESS()

E NEXT day

Line D — A static IP address does not change when the device connects again. The loop should keep using the same ip, so line 4 should be OUTPUT ip.

Question 4

A ip ← "172.16.0.9"

B CONNECT(camera)

C OUTPUT "New address: ", ip

Line C — A static IP address stays the same every time the device connects, so the output should say the address is the same, not new.

Question 5

A ip ← "192.168.1.10"

B type ← "static"

C predictable ← FALSE

Line C — A static IP address is predictable because it never changes, so other devices always know where to find it. Line 3 should be predictable ← TRUE.

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