OCR H446/01 – 1.3 Exchanging data

1.3 Exchanging data - Overview / Checklist
1.3.1 Compression, Encryption and Hashing
(a) Lossy vs Lossless compression.
(b) Run length encoding and dictionary coding for lossless compression.
(c) Symmetric and asymmetric encryption.
(d) Different uses of hashing
1.3.2 Databases
(a) Relational database, flat file, primary key, foreign key, secondary key, entity relationship modelling, normalisation and indexing.
(b) Methods of capturing, selecting, managing and exchanging data.
(c) Normalisation to 3NF.
(d) SQL – Interpret and modify.
(e) Referential integrity.
(f) Transaction processing, ACID (Atomicity, Consistency, Isolation, Durability), record locking and redundancy.
1.3.3 Networks
(a) Characteristics of networks and the importance of protocols and standards.
(b) The internet structure:

    The TCP/IP Stack.
    DNS
    Protocol layering.
    LANs and WANs.
    Packet and circuit switching.

(c) Network security and threats, use of firewalls, proxies and encryption.
(d) Network hardware.
(e) Client-server and peer to peer.

1.3.4 Web Technologies
(a) HTML, CSS and JavaScript.
(b) Search engine indexing.
(c) PageRank algorithm.
(d) Server and client side processing.

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