Cisco 200-105 Exam

What are the two default metrics used by EIGRP for route selection? (Choose two.)

  • A. Bandwidth
  • B. Delay
  • C. Reliability
  • D. Load
  • E. MTU
Answer: Option A. B.
Explanation: 

EIGRP adds together weighted values of different network link characteristics in order to calculate a metric for evaluating path selection.
These characteristics include:
Delay (measured in 10s of microseconds)
Bandwidth (measured in kilobytes per second)
Reliability (in numbers ranging from 1 to 255; 255 being the most reliable) Load (in numbers ranging from 1 to 255; 255 being saturated) Various constants (K 1 through K 5) are able to be set by a user to produce varying routing behaviors.
However by default, only delay and bandwidth are used in the weighted formula to produce a single 32bit metric:Note: Default K values are: K1 = K3 = 1 and K2 = K4 = K5 = 0. When K5 is equal to 0 then [K5/( K4 + reliability)] is defined to be 1
Use of the default constants effectively reduces the formula above to: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/enhanced-interior-gateway-routing-protocol-eigrp/whitepaper_C11-720525.html

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