- (Exam Topic 3)
How does the SteelHead monitor path availability in Path Selection?

1. A. Path availability is not monitored until traffic is sent over that pat
2. B. Then the SteelHead uses standard TCP timeouts to monitor path integrity.
3. C. The SteelHead uses ICMP ping to monitor path availability.
4. D. The SteelHead creates an inner channel on each path and keep-alive packets are used to track availability.
5. E. UDP keep-alives are periodically sent across each pat
6. F. If a SteelHead does not receive two of these within a pre-defined timeout period, the path is declared down.

Correct Answer: B
RiOS 8.5 path selection technology provides the ability to deterministically re-direct select traffic and application flows through alternate WAN routes based on service metrics, such as path availability and priority.
Availability is determined by whether the host at the remote end of a path can be reached via endto-end Internet Control Messaging Protocol (ICMP):
References:
http://www.riverbednews.com/2013/08/path-selection-what-you-need-to-get-started/

- (Exam Topic 3)
When optimizing MAPI, it's important that ALL sessions between client and server are optimized by the same SteelHeads. If a SteelHead goes into admission control that could mean some sessions are passed through.
What can you configure to protect against this?

1. A. Disable admission control on the client side SteelHead.
2. B. Reduce the keep-alive for MAPI sessions.
3. C. Configure alerts to be sent when the SteelHead nears admission control.
4. D. MAPI based admission control can be used.

Correct Answer: C
Example: Issue: Outlook clients are experiencing issues with connectivity through the Riverbed Steelhead Appliance.
Solution: Outlook can open multiple connections to an Exchange server, and Outlook can break if some connections are optimized while others are not, and these situations can occur when the Steelhead reaches Admission Control. RiOS 6.1 has implemented new "MAPI-specific admission control" alarm which is meant to prevent MAPI connections from breaking or hanging if approaching that threshold.
Note: The MAPI protocol uses several TCP sessions between the client and the server.
When doing Latency Optimization on the MAPI protocol, all these TCP sessions between that client and that server need to be optimized between the same two Steelhead appliances.
When one of the Steelhead appliances is close to admission control, there is a chance that not all these TCP sessions will become optimized, with a bad result for the client.
To overcome this possibility, you can configure the Steelhead appliance to not do MAPI Latency Optimization when it is close to admission control.
References:
http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c02948720&lang=en-us&cc=us

- (Exam Topic 1)
How many in-path rules will a LAN-initiated single connection execute on a Steelhead appliance?

1. A. 1
2. B. 2
3. C. 3

Correct Answer: B

- (Exam Topic 1)
Which of the following QoS scheduling algorithms does Steelhead appliance use when QoS is enabled?

1. A. Weighted Random Early Discard
2. B. Weighted Fair Queuing
3. C. Hierarchical Fair Service Curve
4. D. Class Base Weighted Fair Queuing

Correct Answer: C

- (Exam Topic 3)
Which Simplified Routing mode is required when a Virtual SteelHead is deployed in a virtual in-path configuration?

1. A. All
2. B. None
3. C. Destination Only
4. D. Destination and Source

Correct Answer: B
The None option is required for virtual in-path deployments.
References:SteelheadAppliance Deployment Guide, Including the Steelhead Mobile Controller, December 2013, page 194