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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.


Comparison of the OSI and DOD models

DOD ModelOSI Model Network Protocols
   
Process / ApplicationApplication 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 HostTransport TCP, UDP, SPX, NBP (Name Binding Protocol)
InternetNetwork IP, ICMP, IGRP, IPv6, GRE, IPX in IP, L2TP, ARP, RARP, Ping, Tracert, IPX, BGP, OSPF, RIP
Network AccessDatalinkLogical Link Control (LLC)LayerLAN - 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) LayerMAC (hardware) addressing
Physical Electrical (Copper), Optical (Fiber), Radio (Air), Photonic (Light, Laser)

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Memory Chart
TypeSpeedBus Speed
DDRPC2100266Mhz133MHz
DDRPC2700333MHz166MHz
DDRPC3200400MHz200MHz
DDRPC3500433MHz216MHz
DDRPC3700466MHz233MHz
DDRPC4000500MHz250MHz
DDRPC4200533MHz266MHz
DDRPC4400550MHz275MHz
DDRPC4500566MHz283MHz
DDRPC4800600MHz300MHz
DDRPC5000625MHz313MHz
DDR2PC2-4200533MHz266MHz
DDR2PC2-5400667MHz333MHz
DDR2PC2-6000750MHz375MHz
DDR2PC2-6400800MHz400MHz
DDR2PC2-80001000MHz500MHz
DDR2PC2-88001100MHz550MHz
DDR2PC2-90001120MHz560MHz
DDR3PC3-6400800MHz400MHz
DDR3PC3-85001066MHz533MHz
DDR3PC3-106661333MHz667MHz
DDR3PC3-128001600MHz800MHz
DDR3PC3-144001800MHz900MHz
DDR3PC3-160002000MHz1000MHz
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IEEE 802 Working Groups and Networking Protocols

StandardNameDescriptionStatus
   
802.1 Higher Layer LAN Protocols Working GroupActive
802.2NovellLogical Link Control Working GroupInactive
802.3EthernetEthernet Working GroupActive
802.4 Token Bus Working GroupInactive
802.5Token RingToken Ring Working GroupInactive
802.6 Metropolitan Area Network Working GroupDisbanded
802.7 Broadband TAGDisbanded
802.8 Fiber Optic TAGDisbanded
802.9 Isochronous LAN Working GroupInactive
802.10 Security Working GroupInactive
802.11Wi-FiWireless LAN Working GroupActive
802.12 Demand Priority Working GroupInactive
802.14 Cable Modem Working Group (Temporarily housed off-site)Disbanded
802.15 Wireless Personal Area Network (WPAN) Working GroupActive
802.16 Broadband Wireless Access Working GroupActive
802.17 Resilient Packet Ring Working GroupActive
802.18 Radio Regulatory TAGActive
802.19 Coexistence TAGActive
802.20 Mobile Broadband Wireless Access (MBWA) Working GroupActive

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Windows Name Resolution

WINSNETBIOS
Local NetBIOS Name CacheLocal Host Name
WINS ServerHOSTS Files
B-Node BroadcastDNS
LMHOSTS File 

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Cisco Router Configuration Cheat Sheet

NetworkingIEEECisco TermFrame Type
    
TCP/IP802.3arpaEthernet II
    
Novell   
Netware 3.11 or lower (default)802.3novell-etherEthernet 802.3
Netware 3.12 or higher802.2sapEthernet 802.2, Token Ring, FDDI 802.2
AppleTalk on TCP/IP802.2snapEthernet SNAP, Token Ring SNAP, FDDI SNAP
   
   
Address MappingTLAKnownUnknown
    
Address Resolution ProtocolARPIP,  Network, Logical, Layer 3MAC, Media Access Control, Hardware, Layer 2
Reverse Address Resolution ProtocolRARPMAC, Layer 2IP,  Network, Logical, Layer 3
    
   
Routing   
    
Static Routingip 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 ProtocolRIP  
Interior Gateway Routing ProtocolIGRP  
    
Link State   
Open Shortest Path FirstOSPF  
    
Hybrid (DV and LS)   
Enhanced Interior Gateway Routing ProtocolEIGRP  
    
Exterior Gateway Protocols   
Border Gateway ProtocolBGP  
   
Wildcard Masks   
    
255.255.255.255any  
0.0.0.0host  
    
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
    

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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.

 

TCP IP Networking Guidelines

Class

Mask

Networks

Hosts Per Network

Range

A

B

C

Full Class

A

255.0.0.0

126

16.77 M

1.X.X.X -126.X.X.X

B

255.255.0.0

16K

65.5 K

128.X.X.X - 191.X.X.X

C

255.255.255.0

2M

254

192.X.X.X - 223.X.X.X

D

Multicasting

224.X.X.X-239.X.X.X

E

Scientific

240.X.X.X-255.X.X.X

Testing

127.X.X.X

Loopback

127.1.1.1

Non-Routable Private

A

255.0.0.0

1

16.77 M

10.0.0.0 - 10.255.255.255

B

255.255.0.0

16

65.5 K

172.16.0.0 -172.31.255.255

APIPA

255.255.0.0

16

65.5K

168.294.0.0 - 168.294.255.255

C

255.255.255.0

255

254

192.168.0.0 - 192.168.255.255

Basic Subnetting 

Binary