Create
Learn
Share

Acronyms 2

rename
verickle's version from 2016-11-16 20:35

Chapter 6

Question Answer Column 3
IGPInterior Gateway Protocolused for exchanging routing information between gateways (commonly routers) within an autonomous system (for example, a system of corporate local area networks)
EGPExterior Gateway Protocola protocol for exchanging routing information between two neighbor gateway hosts (each with its own router) in a network of autonomous systems
RIPRouting Information Protocolone of the oldest distance-vector routing protocols which employ the hop count as a routing metric
OSPFOpen Shortest Path Firstuses a link state routing algorithm and falls into the group of interior routing protocols, operating within a single autonomous system
IS-ISIntermediate System-to-Intermediate Systemuses a configurable, yet dimensionless, metric associated with an interface and runs Dijkstra's shortest path first algorithm
EIGRPEnhanced Interior Gateway Routing Protocolpopular in Cisco-only networks, it is less popular in mixed-vendor environments
BGPBorder Gateway ProtocolThe only EGP in widespread use today.
NATNetwork Address Translationallows private IP addresses to be translated into Internet-routable IP addresses
PATPort Address Translationallows multiple inside local addresses to share a single inside global address
SNATStatic NATa private IP address is mapped to a public IP address, where the public address is always the same IP address
DNATDynamic NATmultiple public Internet Protocol (IP) addresses are mapped and used with an internal or private IP address
ARPAddress Resolution Protocolmap IP network addresses to the hardware addresses used by a data link protocol
DHCPDynamic Host Configuration Protocoldynamically distributes network configuration parameters, such as IP addresses, for interfaces and services
ADAdministrative Distancethe feature that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols
LSALink State Advertisementcommunicates the router's local routing topology to all other local routers in the same OSPF area
IGMPInternet Group Management Protocolcommunications protocol used by hosts and adjacent routers on IPv4 networks to establish multicast group memberships
PIMProtocol Independent Multicastform a multicast distribution tree, which is the path (or paths) over which multicast traffic flows
PIM-DMPIM Dense Modeuses dense multicast routing
PIM-SMPIM Sparse Modeexplicitly builds unidirectional shared trees rooted at a rendezvous point per group, and optionally creates shortest-path trees per source
RPRendezvous Pointa multicast source sends traffic directly to another router
SPTShortest Path Treebased on its unicast routing table, a last-hop router can form an optimal distribution tree and then prune off the branch of the tree connecting it to the RP
memorize

Chapter 7

Question Answer Column 3
SONETSynchronous Optical Networka Layer 1 technology that uses fiber-optic cabling as its media
DSLDigital Subscriber Linea group of technologies that provide high-speed data transmission over existing telephone wiring
ISDNIntegrated Services Digital Networka digital telephony technology that supports multiple 64-Kbps channels (known as bearer channels [B channels]) on a single connection
ATMAsynchronous Transfer Mode
MPLSMultiprotocol Label Switching
LTELong-Term Evolutiona standard for high-speed wireless communication for mobile phones and data terminals
HSPA+Evolved High-Speed Packet Accessprovides extensions to the existing HSPA definitions and is therefore backward-compatible
CDMACode Division Multiple Accessa channel access method used by various radio communication technologies
GSMGlobal System for Mobile Communicationsa standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile phones
WiMAXWorldwide Interoperability for Microwave Accessprovides wireless broadband access to fixed locations (as an alternative to technologies such as DSL) and mobile devices
CSU/DSUChannel Service Unit/Data Service Unita digital-interface device used to connect a data terminal equipment (DTE), such as a router, to a digital circuit, such as a Digital Signal 1 (T1) line
HDLCHigh-Level Data Link Controllacks many of the features of PPP, and in its standards-based implementation, it can only support a single Layer 3 protocol on a circuit
PPPPoint-to-Point Protocolprotocol used to establish a direct connection between two nodes
SFSuper FrameCombines 12 standard 193-bit frames into a super frame
ESFExtended Super FrameCombines 24 standard 193-bit frames into an extended super frame
IPCPIP Control ProtocolNCP for establishing and configuring Internet Protocol over a Point-to-Point Protocol link
PAPPassword Authentication Protocolperforms one-way authentication (a client authenticates with a server)
CHAPChallenge-Handshake Authentication Protocolauthentication is performed through a three-way handshake
MS-CHAPMicrosoft Challenge-Handshake Authentication Protocola Microsoft-enhanced version of CHAP, offering a collection of additional features, including two-way authentication
RRASRouting and Remote Access Servera Microsoft Windows Server feature that allows Microsoft Windows clients to remotely access a Microsoft Windows network
SLIPSerial Line Internet Protocolan encapsulation of the Internet Protocol designed to work over serial ports and modem connections
ADSLAsymmetric DSLallows an existing analog telephone to share the same line used for data for simultaneous transmission of voice and data
SDSLSymmetric DSLsymmetric (equal) upstream and downstream speeds
VDSLVery High Bit-Rate DSLmuch higher bandwidth capacity than ADSL or SDSL
HFCHybrid Fiber-Coaxboth coaxial and fiber-optic cabling
DOCSISData-Over-Cable Service Interface Specificationspecifies frequencies dedicated to data transmission
PSTNPublic Switched Telephone Networkcomposed of multiple telephone carriers from around the world
POTSPlain Old Telephone ServiceAnalog connections (both voice and data connections) using the PSTN
COCentral OfficeA building containing a telephone company's telephone switching equipment
NIDNetwork Interface Devicea box mounted to the outside of a customer's building
memorize

Chapter 8

Question Answer Column 3
WLCWireless LAN Controllerused to manage light-weight access points in large quantities by the network administrator or network operations center
LWAPPLightweight Access Point Protocola protocol that can control multiple Wi-Fi wireless access points at once (older)
CAPWAPControl And Provisioning of Wireless Access Pointsa protocol that can control multiple Wi-Fi wireless access points at once (newer)
DSSSDirect Sequence Spread SpectrumModulates data over an entire range of frequencies using a series of symbols called chips.
FHSSFrequency Hopping Spread SpectrumAllows the participants in a communication to hop between predetermined frequencies.
OFDMOrthogonal Frequency Division Multiplexinguses a relatively slow modulation rate for symbols
MIMOMultiple Input and Multiple Outputuses multiple antennas for transmission and reception
MU-MIMOMulti-User Multiple Input and Multiple Output802.11ac technology
IBSSIndependent Basic Service Setad hoc WLAN
BSSBasic Service SetWLANs that have just one AP
ESSExtended Service SetWLANs containing more than one AP
WEPWired Equivalent Privacydesigned to provide the same level of security as that of a wired LAN
WPAWi-Fi Protected Accessaims to provide stronger wireless data encryption than WEP
SSIDService Set Identifider32 alphanumeric character unique identifier attached to the header of packets sent over a wireless local-area network
AESAdvanced Encryption Standardmore secure encryption protocol introduced with WPA2
TKIPTemporal Key Integrity Protocolstopgap encryption protocol introduced with WPA
PSKPre-Shared Keya shared secret which was previously shared between the two parties using some secure channel before it needs to be used
EAPExtensible Authentication Protocolan authentication framework frequently used in wireless networks and point-to-point connections
ESSIDExtended Service Set IdentifierAn SSID shared among multiple APs
MICMessage Integrity Checkcan confirm that data was not modified in transit
CCMPCounter Mode with Cipher Block Chaining Message Authentication Code ProtocolUsed by WPA2 for integrity checking
memorize

Chapter 9

Question Answer Column 3
MTTRMean Time To Repaira basic measure of the maintainability of repairable items
MTBRMean Time Between Failuresthe predicted elapsed time between inherent failures of a system during operation
HSRPHot Standby Router ProtocolA Cisco proprietary approach to first-hop redundancy.
CARPCommon Address Redundancy Protocolan open-standard variant of HSRP
VRRPVirtual Router Redundancy Protocolan IETF open standard that operates in a similar method to Cisco's proprietary HSRP
IETFInternet Engineering Task Forcedevelops and promotes voluntary Internet standards, in particular the standards that comprise the Internet protocol suite (TCP/IP)
GLBPGateway Load Balancing Protocolfirst-hop redundancy protocol that is proprietary to Cisco Systems
DSCPDifferentiated Services Code Pointa packet header value that can be used to indicate the level of service requested for traffic, such as high priority or best effort delivery
WFQWeighted Fair Queuingallows to specify, for each flow, which fraction of the capacity will be given
LLQLow-Latency Queuingallows delay-sensitive data (such as voice) to be given preferential treatment over other traffic by letting the data to be dequeued and sent first
WRRWeighted Round-RobinEach packet flow or connection has its own packet queue in a network interface controller.
REDRandom Early DetectionAs the queue depth continues to increase, the possibility of a discard increases until a configurable maximum threshold is reached
CIRCommitted Information Ratethe bandwidth for a virtual circuit guaranteed by an internet service provider to work under normal conditions
BcCommitted BurstThe number of bits or bytes that are sent during a timing interval
BeExcess BurstThe parameter that allows the storing of unused potential bandwidth
LFILink Fragmentation and Interleavingreduces delay and jitter on links by fragmenting large packets and interleaving delay-sensitive packets with the resulting smaller packets for simultaneous transmission across multiple links of a multilink bundle
RSVPResource Reservation Protocolan example of an IntServ approach to QoS
memorize