CompTIA Network+ Certification (Exam N10-007)

CompTIA Network+ Certification (Exam N10-007) What does OSI stand for? Open Systems Interconnection, which is a seven-layer network model What does TCP/IP stand for? Transmission Control Protocol/Internet Protocol Name the 7 layers of the OSI model in order (# & name) Layer 7 Application, Layer 6 Presentation, Layer 5 Session, Layer 4 Transport, Layer 3 Network, Layer 2 Data Link, Layer 1 Physical Bottom-up mnemonic: "Please Do Not Throw Sausage Pizza Away." Top-down mnemonic: "All People Seem To Need Data Processing." What is UTP? Unshielded Twisted Pair cable. Usually contains four pairs of wires that can transmit and receive data Define the Physical Layer of OSI Layer 1 of the OSI model defines the method of moving data between computers, so the cabling and central box are part of the Physical layer (Layer 1). Anything that moves data from one system to another, such as copper cabling, fiber optics, even radio waves, is part of the OSI Physical layer. Layer 1 doesn't care what data goes through; it just moves the data from one system to another system. NOTE: The NIC is NOT considered part of the Physical Layer, but usually is part of Layer 2 (Data Link). What is a MAC address? Inside every NIC, burned onto some type of ROM chip, is special firmware containing a unique identifier with a 48-bit value called the media access control address, or MAC address. No two NICs ever share the same MAC address—ever. Any company that makes NICs must contact the Institute of Electrical and Electronics Engineers (IEEE) and request a block of MAC addresses, which the company then burns into the ROMs on its NICs. Many NIC makers also print the MAC address on the surface of each NIC. Represented in hex, each hex being 4 bits, hence, 12 hex chars make up the 48-bit MAC address value. E.g. D-49