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cost

a configurable value based by default on the bandwidth of the interfac

load

the amount of activity on a network resource

bandwidth

the data capacity of a link

hop count

the number of point-to-point links in a transmission path

reliablity

usually refers to the bit error rare of rach network link

delay

the amount of time required to move a packet from source to destination

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holddown time

prevents a router from improperly reinstating a route from a regular routing update

split horizon

prevents information about a route from being sent in the direction from which the route

defining a maximum

prevents invalid updates from lopping the internetwork indefinitrly

route poisoning

causes a routing protocol to advertsie an infinite metric for a failed route

triggered update

decreases convergence time by immdeiately sendingroute informations response to a topology change

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antispyware

detects software desinged to caputer sensitive information and removes it from the computer

antivirus

prevents known malicious programs from being installed on

workstations

IDS

identifies malicious network traffic and alerts network  personnel

firewall

filters traffic based on source and destination IP address or traffic type

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poison reverse

A router learns from its neighbor that route is down,and the router sends update back to the neighbor with an infinite metric to that route.

LSA

The packets flooded when a toplogy change occues,causing network routers to ipdate their topological database and recelculate routes

split horizon

This prevents sending infomation about a route back out the same interface that originally learned about the route.

holddwon timer

For given period,this cause the router to ignore any updates with poorer metrics to a lost network.