Computer Networks · M2 · mocks
Q1B · Expand an IPv6 address
M2 mock B
Q1(a)+Q1(b) compulsory; choose any two of Q2/Q3/Q4 · 10 marks attempted
Question. Expand 2001:db8::10 into full IPv6 notation and state the number of groups replaced by ::. [2 practice marks]
Answer
Given
Given address: 2001:db8::10.
To find
The full 128-bit address in eight-group hexadecimal notation.
Formula and why
LaTeX: \text{missing groups}=8-\text{visible groups}A written 0 is a visible group. :: represents only the omitted all-zero groups.
Step-by-step solution
Step 1. Count groups on both sides
Left: 2001, db8 (2 group(s)). Right: 10 (1 group(s)).
Step 2. Calculate omitted groups
Visible=2+1=3. Missing=8−3=5.
Step 3. Insert the groups
2001:db8:0:0:0:0:0:10.
Step 4. Pad each group on the left
| Group number | Four-digit group |
|---|---|
| 1 | 2001 |
| 2 | 0db8 |
| 3 | 0000 |
| 4 | 0000 |
| 5 | 0000 |
| 6 | 0000 |
| 7 | 0000 |
| 8 | 0010 |
Step 5. Write all eight in order
2001:0db8:0000:0000:0000:0000:0000:0010.
Final answer: 2001:0db8:0000:0000:0000:0000:0000:0010