問題文
A support engineer finds that a branch office loses connectivity for 6 to 9 seconds whenever the primary circuit fails, and the routing protocol's hold timer is set to 9 seconds. The application drops its sessions during that gap. What should be changed, and what is the trade-off?
選択肢
- Shorten the hold timer to one second, since that detects the failure in the same time as a dedicated mechanism while avoiding a separate protocol in the design.
- Add a static route as a backup so traffic switches immediately.
- Increase the application's session timeout to 10 seconds.
- Add a fast failure detection mechanism between the routers so the failure is noticed in under a second; the trade-off is more control traffic and sensitivity to brief impairments.