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Metrics:

Hop Count; number of routers or hops a packet must take.

Ticks; delay on a data link using IBM PC clock ticks (55 milliseconds or 1/18 of a second).

Cost; arbitrary value usually based on bandwidth, dollar expense, or another measurement, which may be assigned by the network administrator.

Bandwidth; data capacity of the link.

Delay; length of time required to move a packet from source to destination.

Load; amount of activity on a network resource (router or link).

Reliability; refers to bit-error rate of each network link.

MTU (Maximum Transmission Unit); maximum frame length in octets of a L3PDU that is acceptable to all links on the path. If an inbound router interface receives a frame that is larger than the outbound router’s interface MTU, the router will fragment the packet into units allowed by the outbound router interface. If the DF (Don’t Fragment) bit is set, and the packet is too large for the destination network, the packet will be dropped. Ethernet has a MTU of 1500 bytes.

Administrative Distance is an integer value used to determine a preference between two equal routing metrics learned by different routing protocols. It is only important if multiple routing protocols are in use in a single router. When this is true, both routing protocols can learn routes to the same subnets. Because the metric values are different, there is no way to know which routing protocol’s routes are better. This is also considered the rating of trustworthiness.