BSCI (Building Scalable Cisco Internetworks) Exam 
Practice Questions: IS-IS Questions
DIS - Designated Intermediate System

Cisco^® Exam ref: 642-801 (BSCI)

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Q4. OSPF uses DR (Designated Router) to flood the media with Hello packets. IS-IS also uses similar concept to flood the media with Hello packets. Which of the following is analogous to DR of OSI in IS-IS environment?

A. Designated Intermediate System (DIS)

B. Authorized Intermediate System (AIS)

C. Designated Intermediate Router (DIR)

D. Authorized Intermediate Router (AIR)

Ans: A

Explanation: DIS (Designated Intermediate System) is the term used for the router that is elected for flooding the LAN media with Hello packets. The functions of DIS is analogous to DR (Designated Router) used in OSPF environment.

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