25-Comp-B5 Computer Communications
Worked solutions to 4 past sittings (2014–2018), 30 questions. Pick a sitting, or start from a topic below.
Topics across the sittings
Topics that come up in more than one sitting, taken from the headings of our worked solutions. A topic counts once per sitting.
- Aliasing (3 sittings): December 2018 Q1 · December 2016 Q1 · May 2015 Q1
- Channel Capacity (3 sittings): December 2018 Q3 · December 2016 Q2 · May 2015 Q2
- Cyclic Redundancy Check (3 sittings): December 2018 Q5 · December 2016 Q5 · December 2014 Q4
- Sampling (3 sittings): December 2018 Q1 · December 2016 Q1 · May 2015 Q1
- Technical Terminology (3 sittings): December 2018 Q9 · December 2016 Q7 · May 2015 Q7
- Host ID (2 sittings): December 2018 Q8 · December 2016 Q6
- IP Address Class (2 sittings): December 2018 Q8 · December 2016 Q6
- Network ID (2 sittings): December 2018 Q8 · December 2016 Q6
- Required SNR (2 sittings): December 2018 Q3 · December 2016 Q2
- Spread Spectrum Techniques (2 sittings): May 2015 Q6 · December 2014 Q6
- Subnet ID (2 sittings): December 2018 Q8 · December 2016 Q6
Questions by sitting
December 2018
- Question 1: Sampling and Aliasing
- Question 2: Received Power Through a Cascaded Amplifier/Loss Chain
- Question 3: Channel Capacity — Required SNR
- Question 4: AM and FM — Definitions and Modulated-Signal Sketches
- Question 5: Cyclic Redundancy Check (CRC)
- Question 6: Network Topologies for a Shared Office LAN
- Question 7: QPSK Modulation of a Digital Sequence
- Question 8: IP Address Class, Network ID, Subnet ID, and Host ID
- Question 9: Technical Terminology
December 2016
- Question 1: Sampling and Aliasing
- Question 2: Channel Capacity — Required SNR
- Question 3: Network Topologies for a Shared Office LAN
- Question 4: Output Signal-to-Noise Ratio Through a Lossy Channel
- Question 5: Cyclic Redundancy Check (CRC)
- Question 6: IP Address Class, Network ID, Subnet ID, and Host ID
- Question 7: Technical Terminology
May 2015
- Question 1: Sampling and Aliasing
- Question 2: Channel Capacity — Nyquist and Shannon
- Question 3: PCM Uniform Quantization
- Question 4: Manchester and Differential Manchester Encoding
- Question 5: Intranet Network Topologies
- Question 6: Spread Spectrum Techniques
- Question 7: Technical Terminology
December 2014
- Question 1: The OSI Reference Model and ISO
- Question 2: Required Bit Rate for a Document Download
- Question 3: FDM Bandwidth for 10 Voice Channels
- Question 4: Cyclic Redundancy Check (CRC)
- Question 5: HTTP, WWW, and URL
- Question 6: Spread Spectrum Techniques
- Question 7: Networking and Communications Terminology