642-651 - WAASSE - Wide Area Application Services for System Engineers
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What is one advantage of a two-arm WAE deployment?
lowers router utilization
When using PBR, what do you need to configure to enable failover?
Your customer has purchased multiple Cisco WAE appliances, but does not want to dedicate one WAE for management purposes only. How would you advise this customer?
There must be at least one Central Manager available for configuration and management tasks.
A device has recently registered with the Central Manager. What must be done before the device can be used?
It must be activated.
When does window scaling improve performance?
when MWS < BDP
Which statement best describes Cisco WAAS Transport Flow Optimization?
TFO optimizes TCP connections for client-server traffic.
Your customer is planning to deploy a pair of clustered Cisco WAE-7326 appliances in its data center. How many RUs will it need?
Your customer wants to use Active Directory to manage authentication for WAE administrative users. How should you configure authentication in the Cisco WAAS Central Manager?
Configure Active Directory as the primary login method.
Which of these provide a logical grouping of traffic types to support the monitoring and collection of statistics?
Your customer is using PBR as the interception method on its routers. Which mechanism would you recommend to ensure WAE availability and failover if a WAE fails?
enable IP SLAs to track WAE appliances
In a Cisco WAAS implementation, how is the DRE database partitioned into contexts?
One context is provisioned for each connected pair of WAE appliances.
SACK improves performance for which type of traffic?
traffic on lossy networks
Which two functions does the Central Manager provide in a Cisco WAAS environment? (Choose two.)
application statistics monitoring
policy configuration and distribution
How can you monitor optimization statistics for a given application across multiple Cisco WAE devices?
Create a device group for all WAE devices on which that application is optimized.
When you size a Cisco WAAS solution, you should assume that how many of the total number of concurrent TCP connections per user will be optimized?
Which two statements describe what is required for read-only disconnected mode to be automatically activated during a prolonged WAAS disconnect? (Choose two.)
The WAE must be able to access a Windows Domain Controller.
The WAE must be configured for Windows authentication.
Which of these parameters should you consider when selecting a WAE model for a Cisco WAAS deployment?
optimized WAN throughput
What happens if there are three Cisco WAE appliances in the data path of a connection?
The middle WAE in the path goes into pass-through mode for the connection.
How does Cisco WAAS support NBAR?
The WAE appliances do not compress the first few packets of each connection.
Which statement about using the WAE inline card for interception is true?
WCCPv2 must be explicitly disabled on the WAE.
Assume that there are multiple application accelerator WAE appliances at a given site. If a WAE fails, how will the client-server communication be affected for connections that were optimized by the failed WAE?
All optimized TCP connections that were optimized by that WAE will be reset and re-established through another WAE.
How often is the Cisco WAE running the edge file service able to cache previously-seen files to ensure the files are not stale?
every time the file is opened
Your customer's service provider manages its WAN infrastructure. The customer wants to deploy Cisco WAAS to accelerate file services for a small number of branch offices, but the service provider manages the routers at each site and your customer's terms of service prohibit the customer from customizing router configurations. Which interception method should you recommend?
Which high-availability method is used with inline interception?
Your customer's Cisco WAAS design calls for the Central Manager to be deployed on the Core WAE, which is a WAE-612 with 2GB of RAM. The customer initially configured the WAE as an application accelerator, and then issued the device mode central-manager command to enable Central Manager service. Now the customer reports that the WAE is no longer accelerating traffic. What is the problem?
The Central Manager and application accelerator cannot be deployed on the same WAE.
You have configured a Central Manager WAE cluster for your customer. After a technician accidentally unplugs the power cord from the primary Central Manager WAE, the network administrator calls you to complain that the standby Central Manager WAE did not automatically assume the primary role. What should you tell this administrator?
You must manually initiate failover and fallback processes on the WAE.
According to the Cisco Network Foundation Protection architecture, which security feature should be applied at the access layer?
traffic rate limitation
How does Cisco WAAS advanced compression DRE improve on traditional LZ compression?
by removing the transmission of previously-seen data
Which LAN traffic management feature is fully supported by Cisco WAAS?
When WCCPv2 is running on a switch or router, what does it use to redirect traffic to a Cisco WAE?
GRE tunnels or Layer 2 direction
In a Cisco WAAS solution, what is the role of the Catalyst 6500 ACE module?
to provide interception and load-balancing of WAE appliances in the data center
Which two are valid Cisco WAE device modes? (Choose two.)
For optimization to occur, there must be a minimum of how many Cisco WAE appliances in the path between the client and server?
In a Cisco WAAS environment, which TCP connection establishment messages should you examine if your customer has sent you a TCP protocol trace and asked for your help in understanding why the WAE appliances are failing to negotiate the correct, optimized policy?
SYN and SYN ACK
Which feature of Central Manager helps to simplify the configuration of large numbers of Cisco WAE devices?
You should recommend PBR to a customer that requires which type of support?
failover but not load balancing
Which statement best describes the purpose of Cisco WAAS Transport Flow Optimization?
mask problematic WAN conditions
Which two options correctly identify the WAE file services integration modes available in Cisco WAAS? (Choose two.)
transparent, in which the WAE does not appear as a node on the remote office LAN
non-transparent, in which the WAE appears as a node on the remote office LAN
Your customer is using firewalls. What must be permitted to pass through the firewalls in order to allow WAE auto-discovery?
Which of these assign an action to be taken against traffic that matches a criterion?
When configuring adapter policies in a Cisco WAAS environment, what is the purpose of the EPM adapter?
to identify an application's dynamically assigned port number
Cisco WAAS Traffic Flow Optimization provides benefits for which type of application data?
any TCP traffic
How often does a Cisco WAE negotiate the policy to be used for a given connection?
every time a TCP connection is established through the WAE
Your customer wants to configure PortChannels on its Core WAE appliances to enable load balancing across WAE interfaces. Which WAE deployment model must this customer use?
Which two service groups are used when configuring a Cisco WAE as a "promiscuous" TCP device? (Choose two.)
What two symptoms would you expect to observe in a TCP trace if a WAE that was optimizing connections fails? (Choose two.)
All optimized TCP connections handled by that WAE are reset.
The receiving node sees segments with SEQ ACK numbers that it was not expecting.