231 results

i regular expression case-insensitive            

IBM 650 Magnetic Drum Data-Processing Machine World’s first mass-produced computer. Announced 1953.  Wikipedia  This Day in Tech History       

IBM 704 First mass-produced computer with floating-point arithmetic hardware. Introduced in 1954.  Wikipedia  IBM       

IBM Db2 DB2(tm) and Db2(tm) refer to database-server products developed by IBM. These products all support the relational model, but in recent years, some products have been extended to support object-relational features and non-relational structures like JSON and XML. Successor to the 1980s-introducded DB2. Announced in 2017.  Website  Wikipedia       

IBM Model M Keyboard The best keyboard ever made. Uses ALPS switches.   Wikipedia  Wikipedia (IBM keyboard layouts)       

IBM Notes The new name for Lotus Notes.            

IBM Personal System/2 (PS/2)  Released April, 1987. Introduced OS/2 the PS/2  Wikipedia         

iBook Line of laptops from Apple. First released with the iBook G3 June 21, 1999.  Wikipedia         

iBook (Dual USB)  Released May 1, 2001.  Wikipedia         

iBook (FireWire)  Released September 13, 2000.  Wikipedia         

iBook G3 (aka: iBook G3 Clamshell) Released June 21, 1999.  Wikipedia         

iBook SE (aka: iBook Special Edition) Released February 16, 2000.  Wikipedia         

iCloud Cloud storage and synchronization from Apple. Launched October 12, 2011.  Wikipedia  Apple (System Status)       

iCloud Keychain Stores and syncs your passwords across your devices all while encrypted   Wikipedia  Apple Support       

Icons8 38,100 Free Flat Icons in any format, size and color in 20 seconds.   Website         

Identification Verify identity.            

IEC 60309    Wikipedia         

IEC 60320    Wikipedia         

IEC Connector    Wikipedia         

IEEE 1394 (aka: FireWire, i.LINK, Lynx) Serial bus interface for high-speed communications and isochronous real-time data transfer. Typically a coper cable which can be up to 4.5 meters (15 ft.) long. Comes in 4, 6, or 9 pin variants. Maximum power of 30 V and 1.5 A. Supports up to 63 daisy chained devices. Similar to USB, though USB requires a master controller. Developed in the late 1980s and early 1990s by Apple, who called it FireWire. Also known by the brands i.LINK (Sony), and Lynx (Texas Instruments).  Wikipedia         

IEEE 802.11 Standard for wireless.   Wikipedia         

IEEE 802.11a-1999 (aka: 802.11a) Wireless standard that operates at 5GHz. Maximum transfer speed of 54Mbps. Ratified in 1999.  Wikipedia         

IEEE 802.11ac Wireless standard that operates at 5GHz. Transfer speed of at least 1Gbps. Developed from 2008 to 2013. ANSI approved December 11, 2013. he first 802.11ac products from 2013 are referred to as Wave 1, and the newer higher bandwidth products introduced in 2016 are referred to as Wave 2.  Wikipedia         

IEEE 802.11b-1999 (aka: 802.11b) Wireless standard that operates at 2.4GHz. Maximum transfer speed of 11Mbps. Max range of 802.11b and 802.11g is 32m indoors / 140m outdoors. 802.11b products appeared on the market in mid-1999. The Apple iBook was the first mainstream computer sold with optional 802.11b networking.  Wikipedia         

IEEE 802.11g-2003 Amendment to IEEE 802.11 with transfer speeds up to 54Mbps on the same 2.4GHz band as 802.11b. Max range of 802.11b and 802.11g is 32m indoors / 140m outdoors. Rapidly adopted by consumers starting in January 2003, well before ratification.  Wikipedia         

IEEE 802.11i-2004 (802.11i) Amendment to the original IEEE 802.11 witch improved security. Implemented as Wi-Fi Protected Access II (WPA2). Draft standard was ratified on June 24, 2004.  Wikipedia         

IEEE 802.11n-2009 (aka: 802.11n) Wireless standard that can operate at 2.4GHz or 5GHz and is backward compatible with earlier standards. Maximum transfer rate of 600Mbps. Published October 29, 2009.  Wikipedia         

IEEE 802.11r-2008 (aka: fast BSS transition (FT)) Published July 15, 2008.  Website  Wikipedia       

IEEE 802.16 (WiMAX) Originally published in 2001.  Wikipedia (IEEE_802.16)  Wikipedia (WiMAX)       

IEEE 802.1Q Standard for VLANs over Ethernet. Similar frame format to 802.3. (4 extra bytes fields.) Uses a FCS to verify frames were received. Supports tagged and untagged frames. Untagged frames are placed on the native VLAN.   Wikipedia         

IEEE 802.2 Standard for Logical Link Control (LLC).   Wikipedia         

IEEE 802.3 Standard for Ethernet Frame.

[ Preamble (7) | Start of frame delimiter (SFD, 1 bits) | MAC Destination Address (6) | MAC Source Address (6 bits) | 802.1Q tag (optional) (4) | Length (2) | 802.2 Header and Data (46 to 1500) | Frame Check Sequence (FCS, 4 bits) ]

   Wikipedia  Wikipedia (Ethernet Frame)       

if Performs conditional processing in programs or batch files. Pseudo code: if red {do option 1} else {do option 2}   Wikipedia         

ifconfig Command that displays network information such as the current IP address on a UNIX based computer Use ipconfig on Windows.   Wikipedia         

iframe Displays a web page within a web page.   W3Schools         

IKE policy sets             

iMac All-in-one computer made by Apple. Announced May 6, 1998. First released August 15, 1998.  Website  Wikipedia       

iMac Pro

  • 5K display (5120x2880)
  • 500 nits brightness
CPU:8-Core, 10-Core, or 18-Core
RAM:32GB, 64GB, or 128GB
SSD1TB, 2TB, or 4TB
GPU:Radeon Pro Vega 56 or Radeon Pro Vega 64
 Announced June 5, 2017. Released December 14, 2017.  Website  Wikipedia       

imaginary number    Wikipedia         

IMAP Secure (IMAPS) (port 993) Operates over SSL or TLS.   Wikipedia         

impact Harm caused by a threat. Can be measured in two ways: quantitative or qualitative.            

impedance    Wikipedia         

implicit deny Part of an ACL that will block any traffic that has not been allowed by the end of the list.            

IN Equality operator. Can be used in place of INTERSECT if IN is not supported by the DBMS.            

in-band router interfaces             

In-Bound Management             

Incident Response Life Cycle

Detection and analysis
Containment, eradication, and recovery
Post-incident activity

include PHP statement. include 'example.php'   PHP Documentation         

increment (++, plus plus) keep adding 1   Wikipedia         

Independence Day (aka: Fourth of July) Signing of the Declaration of Independence by the Continental Congress of the United States July 4, 2017.  Wikipedia         

Independent BSS (IBSS) (aka: ad hoc) Formed when two wireless network devices are directly connected without an AP. For example; two laptops directly connected wirelessly to transfer files.   Wikipedia         

induced voltage Proportional to the change rate of current. Always opposite in polarity of the applied voltage.            

inductance (L) Measured in henrys (H). One of the primary types of load in AC circuits.   Wikipedia         

inductive reactance (XL) Counter-voltage that limits the flow of current, as does resistance. Measured in ohms. Proportional to inductance of a coil and the frequency of the line.            

inductor Coil of wire wrapped around a core, such as iron. Generates an electromagnetic field. Developed by Michael Faraday in 1831 when he discovered electromagnetic induction.  Wikipedia  YouTube (Make:)       

Industry Standard Architecture (ISA)    Wikipedia         


less thanx < y

inetd Daemon that runs internet services in UNIX   Wikipedia         

infinite ping ping -t             

Information Concealment Engine (ICE)             

Information Security (InfoSec) Integrity, availability, authentication, non-repudiation.   Wikipedia         

Information Security Operations Center (ISOC) (aka: SOC) Facility where Enterprise Information Systems (EIS) are monitored, assessed, and defended.   Wikipedia         

Information Technology (IT)    Wikipedia         

Information Theory    Khan Academy         

Infrared Data Association (IrDA)             

Infrastructure as a Service (IaaS)    Wikipedia         

infrastructure mode A wireless LAN topology. Wireless devices are connected using another device such as an access point or a wireless router.            

ingress Incoming/entering.            

ingress filtering Ensures packets come from where they claim.   Wikipedia         

initialization (init) Fist process to start in UNIX-based operating systems.   Wikipedia         

Initialization Vector (IV) Fixed-size input to a cryptographic primitive that is typically required to be random or pseudorandom. Involves attempting to break WEP keys by targeting their weak IV’s.   Wikipedia         

ink-jet printer Uses drops of ink to print.            

inline-block CSS value for the display property. Ued to arange boxes.   W3Schools         

Input/Output (IO)             

INSERT SQL command used in databases to add new rows to tables.            

Insider Hub Part of the Windows Insider Preview program. Settings > System > Apps & features > Manage optional features, and then select Add a feature. From the list, choose Insider Hub, and then select Install.   Website         

Inspiron Laptop from Dell.   Wikipedia         

Inspiron 7548    Website  Support       

Inspiron 7559    Website  Support  Wikipedia     

Install-WindowsFeature PowerShell command to install rolls, services, or features to Windows Server.

Install-WindowsFeature Server-Gui-Mgmt-Infra,Server-Gui-Shell -RestartInstall a GUI on Server Core
   TechNet  TechNet (Windows Server Installation Options)       

instance Specific object in a class.   Wikipedia         

Instant Messaging (IM) Real-time text communication.   Wikipedia         

Institute of Electrical and Electronics Engineers (IEEE) World's largest association of technical professionals. Founded January 1, 1963.  Wikipedia  Website       

Institution of Engineering and Technology (IET)  Founded in 2006.  Wikipedia         

Instruction Set Architecture (ISA) Interface between hardware and software.   Wikipedia         

Instructions Per Cycle (IPC)             

Instructions Per Second (IPS) Measure of processor speed.   Wikipedia         

Instrumentation Ability to monitor or measure the level of a product's performance for diagnostics.   Wikipedia         

insurance Method of risk transference where the organization pays a premium for the insurance company to assume the risk. If a disaster event occurs, the organization is paid for its losses.            

integer (int) A data type.   Wikipedia         

Integrated Broadband Services (IBBS)    Wikipedia         

Integrated Circuit (IC) Through hole or surface mount.   Wikipedia  YouTube (Make:)       

integrated circuit package The case or "package" for an integrated circuit to mount on a circuit board.   Wikipedia         

Integrated Development Environment (IDE) Application that combines several tools for software development together such as compiler, debugger, and code completion. Examples include: Eclipse, Visual Studio, NetBeans, Xcode,...   Wikipedia         

Integrated Drive Electronics (IDE) The first version of what is now ATA. Developed by Western Digital in 1986.  Wikipedia         

Integrated Services (IntServ) (aka: hard QoS) Parameterized approach to QoS that can make strict bandwidth reservations. Applications use Resource Reservation Protocol (RSVP) to request and reserve resources through a network.   Wikipedia         

Integrated Services Digital Network (ISDN) Private, circuit-switched, WAN infrastructure. Uses telephone circuits to send data.   Wikipedia         

Integrated Services Routers (ISRs)    Wikipedia         

Intel  Founded by Robert Noyce and Gordon Moore July 18, 1968.  Website  Wikipedia       

Intel 4004 4-bit CPU developed by Intel. First  Wikipedia         

Intel 750 Series SSD PCI Express SSD from Intel.   Website  Wikipedia  PC World     

Intel 8008 8-bit Microprocessor developed by Intel. Introduced in April, 1972.  Wikipedia         

Intel 80286 (aka: Intel 286) 16-bit microprocessor developed by Intel. Introduced 1 February 1982.  Wikipedia         

Intel 80386    Website  Wikipedia       

Intel 8080 8-bit Microprocessor developed by Intel. Introduced in April, 1974.  Wikipedia         

Intel 8086 16-bit microprocessor developed by Intel. First member of the x86 family. Introduced in 1978.  Wikipedia         

Intel Core i7 7700K Kaby Lake CPU from Intel. 4 Cores, 8 Threads, 8M Cache, up to 4.50 GHz, 91W TDP Released January 3, 2017.  Intel ARK  Wikipedia       

Intel Core i7-6850K Broadwell-E CPU from Intel. 6 Cores, 12 Threads, 15M Cache, up to 3.80 GHz, 140w TDP. Released Q2, 2016.  Intel ARK  Wikipedia       

Intel Core i7-6900K Broadwell-E CPU from Intel. 8 Cores, 16 Threads, 20M Cache, up to 3.70 GHz, 140w TDP. Released Q2, 2016.  Intel ARK  Wikipedia       

Intel Core i7-6950X Extreme Edition First 10-core desktop CPU from Intel. Announced May 30, 2016.  Intel ARK  Engadget       

Intel Core i9 Family of microprocessors from Intel. Announced at Computex 2017 May 30, 2017.  Website  Wikipedia  The Verge     

Intel Core i9-7980XE CPU from Intel. Announced at Computex 2017 May 30, 2017.  Website  Wikipedia       

Intel Itanium architecture (IA-64) (aka: ia64) Instruction Set Architecture (ISA) for 64-bit Intel microprocessors in the Itanium family. First released June 2001.  Wikipedia         

Intel Optane Family of storage and memory devices from Intel using 3D XPoint. Introduced at IDF 2015  Website  Intel Newsroom       

Intel Xeon E3-1505M v5 8M Cache, 2.80 GHz. Mobile CPU from Intel. Releaseed September 2015.  Intel ARK  Wikipedia       

Intel Xeon E3-1575M v5 8M Cache, 3.00 GHz. Mobile CPU from Intel. Released January 2016.  Intel ARK  Wikipedia       

Intelligent Platform Management Interface (IPMI)    Wikipedia  YouTube (Tek Syndicate)       

interface Facilitates the exchange of information or communication.   Wikipedia         

Interface Devices    Wikipedia         

Interface ID Part of an IPv6 global unicast address. The 'host' portion of the address. A single host may have multiple interfaces each with one or more IPv6 addresses.            

interface loopback Cisco IOS command used to configure a loopback address.

Router(config)# interface loopback value

   Wikipedia  Cisco       

Interface Message Processor (IMP)    Wikipedia         

Interior Gateway Protocol (IGP) Used for routing within an Autonomous System. (RIPv1, RIPv2, IGRP, EIGRP, OSPF, IS-IS)            

Interior Gateway Routing Protocol (IGRP) A link-state routing protocol.            

International Business Machines Corporation (IBM)    Wikipedia         

International Data Encryption Algorithm (IDEA) [originally called Improved Proposed Encryption Standard (IPES)] Symmetric-key block cipher. Intended as a replacement for the Data Encryption Standard (DES). IDEA is a minor revision of an earlier cipher Proposed Encryption Standard (PES). Designed by James Massey of ETH Zurich and Xuejia Lai and was first described in 1991.  Wikipedia         

International Electrotechnical Commission (IEC)    Wikipedia         

International Information Systems Security Certification Consortium (ISC)    Wikipedia  Website       

International Organization for Standardization (ISO)    Wikipedia         

International Telecommunication Union (ITU) Defines open standards and protocols used by the data link layer.   Wikipedia         

internet A network of networks.   Wikipedia  YouTube (Warriors of the Net)       

Internet Architecture Board (IAB)    Website  Wikipedia       

Internet Assigned Numbers Authority (IANA) Assigns port numbers.   Wikipedia  Website       

Internet Control Message Protocol (ICMP) Used by diagnostic tools such as ping and traceroute. Defined in RFC 792 September, 1981.  Wikipedia  RFC 792       

Internet Control Message Protocol version 6 (ICMPv6) ICMP for IPv6            

Internet Corporation for Assigned Names and Numbers (ICANN)    Wikipedia  Website       

Internet Engineering Steering Group (IESG)    Website  Wikipedia       

Internet Engineering Task Force (IETF)             

Internet Group Management Protocol (IGMP)             

Internet Header Length (IHL)             

Internet Information Server (IIS)    Wikipedia         

Internet Information Services (IIS)    Wikipedia         

Internet Key Exchange (IKE) (UDP port 500, RFC 2409) Used to set up a security association (SA) in the IPsec protocol suite to authenticate users and devices. Builds on the Oakley protocol and ISAKMP. Uses X.509 certificates for authentication. Several types of authentication: username, password, one-time password, biometrics, PSK, and digital certificates. Originally defined by the IETF in RFC 2407, RFC 2408 and RFC 2409 November 1998.  Wikipedia  RFC 2407  RFC 2408  RFC 2409   

Internet Key Exchange (IKE) Phase 1 Authentication. 3 keys exchanged. Main mode or aggressive mode.            

Internet Key Exchange (IKE) Phase 2 Key Exchange. IPsec transform sets. unidirectional IPsec SAs.            

Internet Message Access Protocol (IMAP) (IMAP: port 143, IMAPS: port 993) Protocol for email retrieval. IMAP Secure (IMAPS) operates over SSL or TLS. Designed by Mark Crispin in 1986.  Wikipedia         

Internet Printing Protocol (IPP)  Proposed by Novell in 1996.  Wikipedia         

Internet Protocol (IP) The network layer service implemented by the TCP/IP protocol suite. (Connectionless, Best Effort (unreliable), Media Independent.)   Wikipedia  YouTube       

Internet Protocol Flow Information Export (IPFIX)             

Internet Protocol Security (IPsec) Framework of open standards defining how a VPN can be configured and secured. Provides data integrity, peer authentication, data confidentiality (encryption). Not bound to any encryption, authentication, security algorithms, or keying technology. Uses Authentication Headers (AH), Encapsulating Security Payloads (ESP), and Security Associations (SA) as part of its security architecture. The Cisco IPsec implementation uses DES and 3DES in Cipher Block Chaining (CBC) mode. Works at the network layer (Layer 3) encapsulating IP packets. Uses a plaintext Layer 3 header to allow for routing compatibility. When configuring, a few basic parts must be provided: IPsec protocol, confidentiality, integrity, authentication, and secure key exchange.   Wikipedia         

Internet Protocol Security (IPsec) Authentication Guaranties message comes from the right person and was not forged. (PSK, RSA)            

Internet Protocol Security (IPsec) Confidentiality encrypts traffic so it can not be read. (encryption if ESP: DES, 3DES, AES, SEAL)            

Internet Protocol Security (IPsec) Configuration Steps: ACLs, ISAKMP (IKE) policy, IPsec transform set, crypto ACL, crypto map.

  • //ACLs: permit AH, ESP, and ISAKMP on an IPsec interface while denying any other unnecessary traffic
  • Router(config)# access-list (acl) permit ahp (source) (wildcard) (destination) (wildcard)
  • Router(config)# access-list (acl) permit esp (source) (wildcard) (destination) (wildcard)
  • Router(config)# access-list (acl) permit udp (source) (wildcard) (destination) (wildcard) eq isakmp
  • Router(config)# interface s0/0/0
  • Router(config-if)# ip access-group (acl) in
  • //example IKE Policy
  • Router(config)# crypto isakmp policy integer 1-10,000 /*1 = highest priority*/
  • Router(config-isakmp)# authentication pre-share
  • Router(config-isakmp)# encryption des
  • Router(config-isakmp)# group 1
  • Router(config-isakmp)# hash md5 /*If hash is not specified, will use SHA*/
  • Router(config-isakmp)# lifetime 86400
  • //Pre-Shared Keys
  • Router(config)# crypto isakmp key (keystring) address (peer-address)
  • Router(config)# crypto isakmp key (keystring) hostname (hostname)
  • //example
  • Router(config)# crypto isakmp key cisco123 address
  • Router(config)# crypto isakmp key cisco123 address
  • //IPsec Transform Set
  • Router(config)# crypto ipsec transform-set (transform-set-name) (tranform1) (transform2) (transform3) (transform4)
  • //example
  • Router(config)# crypto ipsec transform-set VPN-SET esp-aes 256 esp-sha-hmac
  • //Crypto ACL
  • Router(config)# access-list (acl) {permit | deny} (protocol) (source) (source-wildcard) (destination) (destination-wildcard)
  • //example
  • Router(config)# access-list 110 permit tcp
  • //Crypto Map
  • Router(config)# crypto map (map-name) (seq-num) ipsec-manual
  • Router(config)# match address (access-list)
  • Router(config)# set [peer | pfs | transform-set | security-association]
  • Router(config)# interface (interface-id)
  • Router(config-if)# crypto map MYMAP
  • //example
  • Router(config)# crypto map CMAP 10 ipsec-isakmp
  • Router(config-crypto-map)# match address 110
  • Router(config-crypto-map)# set peer default
  • Router(config-crypto-map)# set peer
  • Router(config-crypto-map)# set pfs group1
  • Router(config-crypto-map)# set transform-set mine
  • Router(config-crypto-map)# set security-association lifetime seconds 86400
   Netacad (Configure Compatible ACLs)  Netacad (IKE Parameters for ISAKMP)  Neatcad (Pre-Shared Keys)  Netacad (Transform Sets)  Netacad (Crypto ACL)  Netacad (Crypto Map)

Internet Protocol Security (IPsec) Integrity Message is not intercepted. (MD5, SHA)            

Internet Protocol Security (IPsec) protocol (AH, ESP, ESP+AH)            

Internet Protocol Security (IPsec) Secure key exchange DH algorithm group            

Internet Protocol version 4 (IPv4) (FC 791) In use since 1983 when it was deployed on the Advanced Research Projects Agency Network (ARPANET). An example address would be:            

Internet Protocol version 6 (IPv6) An IPv6 address is 128 bits long over IPv4's 32 bits. Every 4 bits is represented by a single hexadecimal digit; for a total of 32 hexadecimal values. Not case sensitive. Network portion identified by a prefix (/64). Can range from /0 to /128. Has three address types: Unicast, Multicast, and Anycast. Three address scopes: global, unique-local, and link-local. Draft standard in RFC 2460 December 1998. Standardized in RFC 8200 July 14, 2017.  Wikipedia  RFC 2460  RFC 8200  Internet Society   

Internet Relay Chat (IRC)    Wikipedia         

Internet Security Association and Key Management Protocol (ISAKMP) Creates a Security Association (SA) between two hosts. Defined in RFC 2408 November 1998.  Wikipedia  RFC 2408       

Internet Service Provider (ISP) Provide access to the internet. Four things to consider when choosing an ISP:

   Wikipedia  Netacad       

Internet Small Computer System Interface (iSCSI) Allows for SCSI commands to be sent over IP.   Wikipedia         

Internet Storage Name Service (iSNS) Protocol that allows automated discovery, management and configuration of iSCSI and Fibre Channel devices (using iFCP gateways) on a TCP/IP network.   Wikipedia         

Internet Systems Consortium (ISC)    Wikipedia         

Internet Tidal Wave Memo written by Bill Gates titled "The Internet Tidal Wave" declaring: "The Internet is the most important single development to come along since the IBM PC was introduced in 1981." Sent out May 26, 1995.  Wired  This Day in Tech History       

Internet-Draft (I-D) Working documents published by the IETF.   Wikipedia  IETF       

Internetwork Operating System (IOS) Operating System that runs on Cisco networking gear. Can be stored on non-volatile flash a TFTP server. Copied to RAM when device is powered on.   Wikipedia  YouTube       

Internetwork Packet Exchange/Sequenced Packet Exchange (IPX/SPX)    Wikipedia         

Interrupt Request Level (IRQL) Hardware independent means with which Windows prioritizes interrupts that come from the system's processors.   Wikipedia         

INTO SQL command used in databases to specify a table name.            

Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) An IPv6 transition mechanism meant to transmit IPv6 packets between dual-stack nodes on top of an IPv4 network.   Wikipedia         

intranet internal network of LANs and WANs   Wikipedia         

Intrusion Detection System (IDS) Monitors network traffic. Developed by SRI International in 1984.  Wikipedia         

Intrusion Prevention System (IPS) Responds immediately and inspects traffic before it enters the network. Developed during the late 1990s.  Wikipedia  YouTube       

Inverse Address Resolution Protocol (InARP)             

Inverter (aka: NOT gate)   Wikipedia         

Invoke-Expression PowerShell cmdlet. Invoke-Expression or iex            

Invoke-WebRequest PowerShell cmdlet. Invoke-WebRequest or iwr            

iOS Apple's mobile OS   Wikipedia         

iOS 11  Released September 19, 2017.  Website  Wikipedia       

iOS 11.0.1  Released September 26, 2017.  Apple Support  9to5Mac       

iOS 11.3  Released March 29, 2018.           

IOS update

  • Switch
  • //ensure there is an IP address for the management VLAN
  • Router
  • //ensure there is an IP address for the interface in use

  • Router# copy tftp flash:
  • Address or name of remote host []? ip address
  • Source filename []? source filename
  • Destination filename [source filename]?
   YouTube (Lextraindotcom)         

IP Address Management (IPAM) Tracks IP aDDRESSES IN A NETWORK.   tECH nET  Wikipedia       

IP Private Branch Exchanges (PBXs)             

ip route Command to configure a static route.

IOS syntax: destination network-address subnet-mask {next hop router's ip address | exit interface}

IP Suite A suite of protocols required for sending and receiving data using the Internet.   Wikipedia         

IP-Header Identifies the packet characteristics. Significant fields in the IPv4 header include: Version, Differentiated Services (DS), Time-to-Live (TTL), Source IP Address, Destination IP Address.            

iPad Tablet made by Apple. First announced January 27, 2010.  Wikipedia         

ipaddress Python library for manipulating IP addresses.   Python Documentation         

ipconfig Command that displays network information such as the current IP address on a Windows based computer. Use ifconfig on a UNIX-based machine.

/all Display full configuration information.
/displaydns Display the contents of the DNS Resolver Cache.
/flushdns Purges the DNS Resolver cache.
/registerdns Refreshes all DHCP leases and re-registers DNS names.
/release Release the IPv4 address for the specified adapter.
/release6 Release the IPv6 address for the specified adapter.
/renew Renew the IPv4 address for the specified adapter.
/renew6 Renew the IPv6 address for the specified adapter.
/setclassid Modifies the DHCP class id.
/setclassid6 Modifies the IPv6 DHCP class id.
/showclassid Displays all the DHCP class IDs allowed for adapter.
/showclassid6 Displays all the IPv6 DHCP class IDs allowed for adapter.
   Wikipedia  Microsoft TechNet       

Iperf Tool for active measurements of the maximum achievable bandwidth on IP networks. Can create TCP and UDP data streams and measure the throughput of a network that is carrying them.   Website  Wikipedia       

iPhone Smartphone made by Apple. First released June 29, 2007.

Version Release Date
iPhone 2007
iPhone 3G 2008
iPhone 3GS 2009
iPhone 4 2010
iPhone 4S 2011
iPhone 5 2012
iPhone 5S 2013
iPhone 5C
iPhone 6 2014
iPhone 6 Plus
iPhone 6S 2015
iPhone 6S Plus

  Wikipedia  Website       

iPhone 6  Released September 19, 2014.  Wikipedia         

iPhone 6S  Released September 25, 2015.  Wikipedia         

iPhone 7 Smartphone made by Apple. Announced September 7, 2016. Released September 16, 2016  Website  Wikipedia       

iPhone 8 Smartphone from Apple. Announced September 12, 2017 at an Apple Special Event. Pre-order September 15, 2017. Available September 22, 2017.  Website  Wikipedia  MacRumors     

iPhone SE  Released March 31, 2016.  Website  Apple Press Info  Wikipedia     

iPhone X Smartphone from Apple.

  • 149.59 mm (5.8 in)
  • OLED
  • 2436 x 1125
  • 458 ppi
CPU: A11 Bionic chip
Memory:3 GB RAM
Storage: 64 GB or 256 GB
  • Rear camera: Dual 12 MP
    • Wide-angle f/1.8
    • Telephoto f/2.4
  • Front camera: 7 MP, f/2.2
 Announced September 12, 2017 at an Apple Special Event. Per-order October 27, 2017. Available November 3, 2017.  Website  Wikipedia       

iPod Portable music player made by Apple. First released October 23, 2001.  Apple Press Info  Wikipedia       

iPod and iPhone Software Update File (IPSW) Firmware for iPods, iPhones, and iPads.   FileInfo         

IPS A set of rules that an IDS and an IPS use to detect typical intrusion activity, such as DoS attacks.    Cisco         

IPS Atomic Signature simplest type of IPS signature            

IPS Composite Signature             

IPsec transform sets IPsec security parameters. (AH or ESP plus the associated algorithm.)            

IPv4 Addresses IPv4 includes, private, network, broadcast, loopback, link-local, TEST-NET, and experimental addresses.            

IPv4 embedded Type of unicast address used to help transition from IPv4 to IPv6.            

IPv4 packet Contains two parts; the IP Header and the Payload. Does not have subnet mask.            

ipv6 address autoconfig Router(config-if)# ipv6 address autoconfig   Cisco         

IPv6 anycast Unicast address that can be assigned to multiple devices. Packets are routed to the nearest device with that address.            

IPv6 default static route prefix is ::/0            

IPv6 global unicast A type of IPv6 unicast address. Globally unique and routable (like public IPv4). Current ranges are 2000::/3. Can be configured manually or automatically with SLAAC and DHCPv6. Has a global routing prefix subnet ID and interface ID.

[ global routing prefix, 48 bits | subnet ID, 16 bits | Interface ID, 64 bits ]


IPv6 multicast For sending an IPv6 packet to multiple destinations.            

IPv6 unicast Uniquely identifies an interface. These can be Global Unicast, Link-Local, Loopback, Unspecified Address, Unique Local, Embedded IPv4.            

IS NOT NULL SQL operator for data that is present or known.   W3Schools         

IS NULL SQL operator for data that is missing or unknown.   W3Schools         

IS-IS IGP, link-state, classless protocol.   Wikipedia         

Isaac Asimov American writer and professor of biochemistry at Boston University. He was known for his works of science fiction and popular science. Asimov was a prolific writer. January 2, 1920 - April 6, 1992.  Wikipedia         

ISACA Risk IT Framework    Website         

ISDN BRI Two 64Kbps B channels and one 16Kbps D channel. Used for home and small enterprise. Inadequate for video but works fine for voice.            

ISDN PRI 23 64Kbps B T1 (30 B E1) channels and 1 64Kbps D channel (1.544Mbps total).             

ISO 9660 The file system used in compact discs as a standard across multiple operating systems.   Wikipedia         

ISO Image Archive file of an optical disc.   Wikipedia         

isolation transformer Primary and secondary windings are electrically and mechanically separated. Help filter voltage and current spikes between the primary and secondary side.            

isset Determine if a variable is set and is not NULL in PHP.   PHP Documentation         

IT as a Service (ITaaS)    Wikipedia  Netacad       

Itanium Family of 64-bit microprocessors from Intel. First released June 2001.  Wikipedia         

ItemControl    Microsoft Developer Network         

Ivy Bridge Microarchitecture codename from Intel. First released April 29, 2012.  Wikipedia