Reference: Networking Mnemonics

The following is a list of networking Mnemonics which I have either created, been told about or read about as a method of remembering various aspects of networking as part of my study. This list will be updated as time goes on:

The OSI Model

OSI LayerMnemonicOSI Layer description
1PeoplePresentation
2Don’tData-link
3NeedNetwork
4ThoseTransport
5StupidSession
6PacketsPresentation
7AnywayApplication

The OSI Model (Alternative)
Please Do Not Take Sales Peoples Advice

EIGRP K Values

K ValueMnemonicK Value Description
K1BigBandwidth
K2LatenciesLoad
K3Don’tDelay
K4ReallyReliability
K5MatterMTU

OSPF LSA Types

LSA TypeMnemonicLSA Description
Type 1RightRouter LSA
Type 2NowNetwork LSA
Type 3SomeSummary LSA
Type 4ArgueASBR Summary LSA
Type 5As1ASBR External LSA
Type 6GoodGroup Membership LSA
Type 7NetworkNSSA LSA
Type 8EngineersExternal Attributes
Type 9LookLink Scope Opaque
Type 10AlwaysArea Scope Opaque
Type 11AsideAS Scope Opaque

1 Think of As path to remember external

Cisco BGP Attributes (NB: Not yet completed)

BGP Metric Mneumonic PreferenceSignificanceRequirement
WeightHighestLocal
Local PreferenceHighestLocal AS
Local originatedLocal originatedLocal
AS PathShortestGlobal
MEDLowerGlobal
ExternaleBGP > iBGP
IGP costLowest
eBGP PeerinOldest
Router IDLowest

BGP attributes are evaluated from the top down. Preference is which value is better than another value and significance is whether that property carries to other AS, Is local to the AS or is local to the device. Compatibility is whether something is vendor proprietarty.

Syslog Severity levels

Syslog levelMneumonicSyslog Level description
0EveryoneEmergency
1AlwaysAlert
2ComplainsCritical
3EvenError
4WhenWarning
5NothingNotification
6IsInformational
7DifferentDebugging

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