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bajeluk/nos_en_exam_topics.md

Last active May 18, 2017 15:18
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NOS english exam topics
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nos_en_exam_topics.md

Reference network models. The ISO/OSI reference model, description of the individual layers. The TCP/IP reference model, distinctions to the ISO/OSI, correspondence the TCP/IP and OSI layers, the most important protocols in the individual layers.

Guided transmission media. Twisted pair cables, UTP 5, 5e, 6, 7. Coaxial cables. Fiber optics, multimode and single-mode fibers, core and cladding, source of light.

Modulated and unmodulated signal. NRZ, Manchester coding, 4B/5B coding. Narrow spectrum and spread spectrum, types of multiplexing: FDM, TDM, CDM/CDMA.

Medium Access Control. CSMA. 1-persistent, 0-persistent and p-persistent. CSMA/CD. WiFi collision avoidance, RTS, CTS, CSMA/CA. Ethernet: HUBs and switches, collision domain. Routers and gateways.

DNS. Top-level domains, resources: A, MX, NS, CNAME, reverse lookups. Nameservers and zones, authoritative record.

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