Find the Critical Path and the Time Required

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Presentation transcript:

Find the Critical Path and the Time Required

Computing Over Distance Networking Computing Over Distance

Intro The Layers The Words The Parts

The Layers How many – OSI (Open Systems Interconnection) Model Lower Layers Physical Hardware Network cards Layer 1 Physical examples include Ethernet, FDDI, B8ZS, V.35, V.24, RJ45. Data Link MAC (Media Access Control) LLC (Logical Link Control) Layer 2 Data Link examples include PPP, FDDI, ATM, IEEE 802.5/ 802.2, IEEE 802.3/802.2, HDLC, Frame Relay,

The Layers Lower Layers (continued) Network Transport ICMP – Internet Control Message Protocol Reports problems in transmission IP – Internet Protocol Sends and receives addresses Does not care about reliability - Layer 3 Network examples include AppleTalk DDP, IP, IPX. Transport Flow control TCP – Transmission Control Protocol UDP – User Datagram Protocol - Layer 4 Transport examples include SPX, TCP, UDP.

The Layers Upper Layers Session Presentation Application Manages applications in use - Layer 5 Session examples include NFS, NetBios names, RPC, SQL Presentation Translation of information - Layer 6 Presentation examples include encryption, ASCII, EBCDIC, TIFF, GIF, PICT, JPEG, MPEG, MIDI. Application The final product - Layer 7 Application examples include WWW browsers, NFS, SNMP, Telnet, HTTP, FTP