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Ventura International Information Super Highway & Everett Batey, Oxnard, California 93035, USA
Layer Name Devices Functions Protos
7 Application GW - tools that accomplish tasks e.g. word processor,
-- include, not limited to, file, print, and messaging services.
6 Presentation GW - changes the presentation of data from lower layers into a format the upper-layer processes can work with.
-- encryption, data compression, redirectors.
5 Session GW Establishing, maintaining, breaking sessions, NFS, RPC, ...
4 Transport GW, Packet Filtering FW TCP, UDP, SPX, NetBEUI
- checks that data delivered error-free.
- divides message too long into smaller segments
- takes series of short messages, combine into longer segment. sequencing
- handles logical address/name resolution.
3 Network (packets) Router, Packet
Filtering FW 		IP, IPX, RIP, ICMP, ARP, RARP, OSPF, EGP
- Logical network addressing and routing.
2 Data Link (frame) Router, Bridge HDLC, SLIP, PPP
- Takes raw Physical layer data, gives it logical structure.
- Hands frames down to the Physical layer for bit-level encoding
- (X.25 and LLC2 used in SNA)
1 Physical (bits) Hub, Switch, Bridge Places bits on media
RFC 1918: A 10.0.0.0 - 10.255.255.255 (10/8 prefix)
RFC 1918: B 172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
RFC 1918: C 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
Copyright © 1997 through 2012, Ventura International Information Super Highway & Everett Batey, Oxnard, California 93035, USA
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