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A detailed overview of the osi (open systems interconnection) model, which is a conceptual framework used to describe the functions of a networking system. It covers the seven layers of the osi model, including the application, presentation, session, transport, network, data link, and physical layers. The document answers key questions about each layer, such as their functions, protocols, and related hardware components. It also addresses important networking concepts like mac addresses, ip addressing, network address translation (nat), and more. This comprehensive resource is an invaluable tool for students and professionals seeking to deepen their understanding of network architecture and communication protocols.
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What is layer 7 of the OSI model? ✔✔application What layer number is the Application layer of the OSI model? ✔✔ 7 What is layer 6 of the OSI model? ✔✔presentation What layer number is the Presentation layer of the OSI model? ✔✔ 6 At which OSI layer is encryption / decryption? ✔✔ 6 or presentation At which OSI layer is data compression? ✔✔ 6 or presentation What is layer 5 of the OSI model? ✔✔session What layer number is the Session layer of the OSI model? ✔✔ 5
What is layer 4 of the OSI model? ✔✔transport What layer number is the Transport layer of the OSI model? ✔✔ 4 What does MTU stand for? ✔✔maximum transmission (or transfer) unit What is the typical value for MTU (in bytes)? ✔✔ 1500 At which OSI layer are software ports? ✔✔ 4 or transport What does TCP stand for? ✔✔transmission control protocol Which protocol provides for guaranteed delivery of information? ✔✔TCP, or Transmission Control Protocol At which OSI layer is TCP? ✔✔ 4 or transport
What does WAN stand for? ✔✔wide area network At which OSI layer is IP Addressing? ✔✔ 3 or network At which OSI layer is Logical Addressing? ✔✔ 3 or network At which OSI layer does a router operate? ✔✔ 3 or network At which OSI layer does a gateway operate? ✔✔ 3 or network At which OSI layer is Network Address Translation? ✔✔3 or network At which OSI layer is Port Address Translation? ✔✔ 3 or network At which OSI layer do we find packets? ✔✔ 3 or network
What is the Protocol Data Unit at OSI layer 3? ✔✔packet What is layer 2 of the OSI model? ✔✔datalink What layer number is the Data Link layer of the OSI model? ✔✔ 2 What does MAC stand for? ✔✔media access control How does a typical laptop computer discover its own MAC address? ✔✔It already knows it. It is burned in on the network card. At which OSI layer is the Local Area Network? ✔✔ 2 or datalink At which OSI layer is MAC Addressing? ✔✔ 2 or datalink At which OSI layer is Physical Addressing? ✔✔ 2 or datalink At which OSI layer is Ethernet? ✔✔ 2 or datalink
At which OSI layer is wireless signal? ✔✔ 1 or physical At which OSI layer is coaxial cable? ✔✔ 1 or physical At which OSI layer is cat5 cable? ✔✔ 1 or physical At which OSI layer is fiber-optic cable? ✔✔ 1 or physical What is a multi-port repeater called? ✔✔hub What is a two-port hub called? ✔✔repeater At which OSI layer does a hub operate? ✔✔ 1 or physical At which OSI layer does a signal repeater operate? ✔✔ 1 or physical At which OSI layer do we find bits? ✔✔ 1 or physical
What is the Protocol Data Unit at OSI layer 1? ✔✔bits What is a software port? ✔✔A port is a number that indicates which computer program should receive the message. What is a hop? ✔✔A hop is the moving of a packet from one LAN to another. What does TTL stand for? ✔✔time to live What is the purpose of TTL? ✔✔It reduces the risk of network loops. What does having a routable address mean? ✔✔Packets can be sent to you by using your own IP address. What are the five non-routable IP address blocks? ✔✔10.x.x.x, 127.x.x.x, 169.254.x.x, 172.16- 31.x.x, and 192.168.x.x.
What is a keep-alive? ✔✔A keep-alive is a message that is sent between two computers just to keep the connection from timing out and being dropped.