Intermediate System to Intermediate System (IS-IS), Is a Protocol Used

question 216

Multiple Choice

Intermediate system to intermediate system (IS-IS) , is a protocol used by network devices (routers) to determine the best way to forward datagrams through a packet-switched network, a process called routing. A client has approached you about deploying very fast IS-IS hello timers across an intercontinental high speed SONET link. What's your option?

• A) Fast hello timers are a good choice for this link because the length of the link indicates there will be at least one SONET amplifier that disables PATH alarms on the circuit.
• B) Fast hello timers are a good choice for this link because on long haul SONET links the reporting of LINE and PATH errors can take a long time.
• C) Fast hello timers are not a good choice for this link because the link is physically long and the propagation delay may cause IS-IS to believe the link has failed when it has not.
• D) Fast hello timers are not a good choice for this link because SONET links provide link-down notification much faster than IS-IS could detect a circuit failure by means of hello processing.

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