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Computer and network reference
The following information is provided as a free informational service on a variety of Information Technology subjects. Click on the subject heading below to expand list of subject matter.
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Computing and Networking
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Microsoft
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Cisco
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TCP/IP Networking
Comparison of the OSI and DOD models
| DOD Model | OSI Model | Network Protocols | |
| Process / Application | Application | Telnet, FTP, SMTP, FTAM (File Transfer, Access, and Management), VTP (Virtual Terminal Protocol),CMID (Common Management and Information Protocol | |
| Presentation | ASCII, EBCDIC, JPEG, GIF, TIFF, MPEG, WAV | ||
| Session | RPC, ZIP (Zone Information Protocol), SCP (Session Control Protocol) | ||
| Host to Host | Transport | TCP, UDP, SPX, NBP (Name Binding Protocol) | |
| Internet | Network | IP, ICMP, IGRP, IPv6, GRE, IPX in IP, L2TP, ARP, RARP, Ping, Tracert, IPX, BGP, OSPF, RIP | |
| Network Access | Datalink | Logical Link Control (LLC)Layer | LAN - Ethernet (802.3), Fast Ethernet, Token Ring (802.5), Wi-Fi (802.11), FDDI |
| WAN -Frame Relay, ATM, LAP, LAPB (Link Access Procedure, Balanced), SDLC(Synchronous Data Link Control), PPP, SMDS, SIP | |||
| Media Access Control (MAC) Layer | MAC (hardware) addressing | ||
| Physical | Electrical (Copper), Optical (Fiber), Radio (Air), Photonic (Light, Laser) |
| Memory Chart | |||
| Type | Speed | Bus Speed | |
| DDR | PC2100 | 266Mhz | 133MHz |
| DDR | PC2700 | 333MHz | 166MHz |
| DDR | PC3200 | 400MHz | 200MHz |
| DDR | PC3500 | 433MHz | 216MHz |
| DDR | PC3700 | 466MHz | 233MHz |
| DDR | PC4000 | 500MHz | 250MHz |
| DDR | PC4200 | 533MHz | 266MHz |
| DDR | PC4400 | 550MHz | 275MHz |
| DDR | PC4500 | 566MHz | 283MHz |
| DDR | PC4800 | 600MHz | 300MHz |
| DDR | PC5000 | 625MHz | 313MHz |
| DDR2 | PC2-4200 | 533MHz | 266MHz |
| DDR2 | PC2-5400 | 667MHz | 333MHz |
| DDR2 | PC2-6000 | 750MHz | 375MHz |
| DDR2 | PC2-6400 | 800MHz | 400MHz |
| DDR2 | PC2-8000 | 1000MHz | 500MHz |
| DDR2 | PC2-8800 | 1100MHz | 550MHz |
| DDR2 | PC2-9000 | 1120MHz | 560MHz |
| DDR3 | PC3-6400 | 800MHz | 400MHz |
| DDR3 | PC3-8500 | 1066MHz | 533MHz |
| DDR3 | PC3-10666 | 1333MHz | 667MHz |
| DDR3 | PC3-12800 | 1600MHz | 800MHz |
| DDR3 | PC3-14400 | 1800MHz | 900MHz |
| DDR3 | PC3-16000 | 2000MHz | 1000MHz |
IEEE 802 Working Groups and Networking Protocols
| Standard | Name | Description | Status |
| 802.1 | Higher Layer LAN Protocols Working Group | Active | |
| 802.2 | Novell | Logical Link Control Working Group | Inactive |
| 802.3 | Ethernet | Ethernet Working Group | Active |
| 802.4 | Token Bus Working Group | Inactive | |
| 802.5 | Token Ring | Token Ring Working Group | Inactive |
| 802.6 | Metropolitan Area Network Working Group | Disbanded | |
| 802.7 | Broadband TAG | Disbanded | |
| 802.8 | Fiber Optic TAG | Disbanded | |
| 802.9 | Isochronous LAN Working Group | Inactive | |
| 802.10 | Security Working Group | Inactive | |
| 802.11 | Wi-Fi | Wireless LAN Working Group | Active |
| 802.12 | Demand Priority Working Group | Inactive | |
| 802.14 | Cable Modem Working Group (Temporarily housed off-site) | Disbanded | |
| 802.15 | Wireless Personal Area Network (WPAN) Working Group | Active | |
| 802.16 | Broadband Wireless Access Working Group | Active | |
| 802.17 | Resilient Packet Ring Working Group | Active | |
| 802.18 | Radio Regulatory TAG | Active | |
| 802.19 | Coexistence TAG | Active | |
| 802.20 | Mobile Broadband Wireless Access (MBWA) Working Group | Active |
| WINS | NETBIOS |
| Local NetBIOS Name Cache | Local Host Name |
| WINS Server | HOSTS Files |
| B-Node Broadcast | DNS |
| LMHOSTS File |
Cisco Router Configuration Cheat Sheet
| Networking | IEEE | Cisco Term | Frame Type |
| TCP/IP | 802.3 | arpa | Ethernet II |
| Novell | |||
| Netware 3.11 or lower (default) | 802.3 | novell-ether | Ethernet 802.3 |
| Netware 3.12 or higher | 802.2 | sap | Ethernet 802.2, Token Ring, FDDI 802.2 |
| AppleTalk on TCP/IP | 802.2 | snap | Ethernet SNAP, Token Ring SNAP, FDDI SNAP |
| Address Mapping | TLA | Known | Unknown |
| Address Resolution Protocol | ARP | IP, Network, Logical, Layer 3 | MAC, Media Access Control, Hardware, Layer 2 |
| Reverse Address Resolution Protocol | RARP | MAC, Layer 2 | IP, Network, Logical, Layer 3 |
| Routing | |||
| Static Routing | ip route [dest net] [mask] [next hop address (gateway)] [admin distance] [perm] | ||
| ip route [dest net] [mask] [exit interface] [admin distance] [perm] | |||
| Distance Vector | |||
| Routing Information Protocol | RIP | ||
| Interior Gateway Routing Protocol | IGRP | ||
| Link State | |||
| Open Shortest Path First | OSPF | ||
| Hybrid (DV and LS) | |||
| Enhanced Interior Gateway Routing Protocol | EIGRP | ||
| Exterior Gateway Protocols | |||
| Border Gateway Protocol | BGP | ||
| Wildcard Masks | |||
| 255.255.255.255 | any | ||
| 0.0.0.0 | host | ||
| Cisco IP Configuration Conventions | |||
| Network address of all 0s means "this network or segment" | |||
| Network address of all 1s means "all networks" | |||
| Node address of all 0s means "this node" | |||
| Node address of all 1s means "all nodes" | |||
| Entire IP address set to all 0s is the Cisco default route | |||
| Entire IP address set to all 1s is the broadcast address for all nodes on the current network | |||
TCP/IP Networking
IP Subnet Calculator http://www.subnet-calculator.com/
The IP Subnet Mask Calculator enables Subnet network calculations using network class, IP address, subnet mask, subnet bits, mask bits, maximum required IP subnets and maximum required hosts per subnet.
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TCP IP Networking Guidelines |
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