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Flashcards by Malachy Moran-Tun, updated more than 1 year ago
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| Question | Answer |
| What is a Protocol Layer? | > Group or collection protocols that work at a similar level in the networking process > Should be independent of each other > Should only interact with each other when considering the inputs and outputs of each layer > Layers are an example of abstraction |
| What are the 4 Layers of the TCP Model and their Role? | Transmission Control Protocol Model: 1. Application layer > Creates and interprets data (e.g., HTTP, IMAP, FTP etc.) 2. Transport layer > Splits and joins data (e.g., TCP) 3. Internet layer > Adds addresses to data (e.g., IP) 4. Network access layer > Converts data into electrical signals (e.g., Ethernet, Wifi) |
| What are the 7 Layers of the OSI Model? | Open Systems Interconnection Model: 1. Application 2. Presentation 3. Session 4. Transport 5. Network 6. Data link 7. Physical |
| How are the TCP and OSI Models Related? | > Both describe the exact same network system > First 3 layers of OSI are the group into TCP's "Application" layer > Transport layers are both shared > OSI's "Network" layer is called "Internet" in TCP > OSI's bottom two layers are grouped into TCP's "Network Access" layer |
| What are the Advantages of Layering? | > Layers are self-containing, making diagnosing and debugging issues much easier > Application developers can create networked applications without knowing how the network physically work > Layers can be changed as long as the I/O remains consistent, meaning they can be improved without affecting other parts of the system > People can specialise in one specific layer, allowing for much more specific development and innovation |
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