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Netzwerktechnik 2 (Subject) / Chapter 1 (Lesson)
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- What are network protocols? They are rules defined and standarized by various organisations.
- Why do we need networking protocols and standards? interoperabilitysafetysecuritycompatibility
- Name a few organisations which define standards. ISO, ANSI, IEEE, TIA
- What are some purposes of network models and layers? Interoperability Functionality of protocols Reduction of complexity
- Name two network models TCP/IP modelOSI model
- List all layers of the OSI model and name protocols or devices Layer 1 - Physical Layer (cables, ethernet)Layer 2 - Data Link Layer (switch, mac-addresses)Layer 3 - Network Layer (router, ip-addresses)Layer 4 - Transport Layer (TCP, UDP) Layer 5 - Session Layer (Start & End Sessions)Layer 6 - Presentation Layer (SSL, format data)Layer 7 - Application Layer (HTTP, DNS, FTP, SMTP)
- What does PDU stand for? Protocol Data Unit
- What are the names of PDUs from Layer 1 to Layer 4 in OSI? L1 - BitL2 - FrameL3 - PacketL4 - Segment
- Name some network devices and the OSI layer at which it operates. L1 - HUBL2 - SwitchL3 - RouterL7 - Firewall
- What is encapsulation? process of taking data from one protocol and translating it into another protocol
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- What is decapsulation? the process of opening up encapsulated data that are usually sent in the form of packets over a communication network
- Encapsulation and Decapsulation. Which of these two processes happens at the sender and which happens at the receiver? Encapsulation -> SenderDecapsulation -> Receiver