单选题Which Packet Flow Acceleration feature is most effective for short-lived TCP sessions?（）A Active Flow PipeliningB Fast Connection SetupC TCP Acceleration (AFP)D Forward Error Correction

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第2题：

Which of the following is not a characteristic of fast switching？（）

• A、Fast switching reducesa routers CPU utilization， compared to process switching
• B、All packets of a flow， except for the first packet， use the information in the fast cache
• C、It can be enabled with the interface command ip route-cache
• D、Fast switching uses a fast cache maintained in a router’s control plane
• E、The fast cache contains information about how traffic from different data flows should beforwarded
• F、Even though the fast switching is enabled， the first packet of a flow is still process switched

第3题：

A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocol is to create a (2) and error-control mechanism at the transport level. TCP uses a sliding (3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve (4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (5) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver. 空白（2）处应选择（）

• A、procedure
• B、function
• C、route
• D、flow

第4题：

Which two scenarios would benefit the most from TCP Acceleration? （）(Choose two.)

• A、low-latency networks
• B、high-latency networks
• C、long-haul, low-bandwidth links
• D、long-haul, high-bandwidth links

第5题：

Which two environments would take advantage of TCP Acceleration (AFP)? （）(Choose two.)

• A、satellite networks
• B、low-latency networks
• C、long-haul link with 95% compressibility.
• D、long-haul link with 10% compressibility.

第6题：

Which two statements about JUNOS Software packet handling are correct？（）

• A、JUNOS Software applies service ALGs only for the first packet of a flow.
• B、JUNOS Software uses fast-path processing only for the first packet of a flow.
• C、JUNOS Software performs route and policy lookup only for the first packet of a flow.
• D、JUNOS Software applies SCREEN options for both first and consecutive packets of a flow.

第7题：

What are two features of Packet Flow Acceleration?（） (Choose two.)

• A、Policy-Based Multipath
• B、TCP Acceleration (AFP)
• C、Forward Error Correction
• D、Molecular Sequence Reduction

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第13题：

What are three problems with the tail drop mechanism of managing interface congestion？（）

• A、Queuing introduces equal delays for packets of the same flow， resulting in jitter.
• B、When congestion occurs， dropping affects most of the TCP sessions， which simultaneously back off and then restart again.
• C、All buffers can temporarily be seized by aggressive flows， and normal TCP flows experience buffer starvation.
• D、There is no differentiated drop mechanism. Higher priority traffic is dropped in the same way as best-effort traffic.
• E、In TCP starvation， traffic exceeds the queue limit because of the bursty nature of packet networks. A router cannot handle multiple concurrent TCP sessions.
• F、Global synchronization occurs because multiple TCP hosts reduce their transmission rates at random intervals in response to packet dropping

第14题：

Which feature is a potential security weakness of a traditional stateful firewall？（）

• A、It cannot support UDP flows.
• B、It cannot ensure each TCP connection follows a legitimate TCP three-way handshake.
• C、It cannot detect application-layer attacks.
• D、The status of TCP sessions is retained in the state table after the sessions terminate.

第15题：

Exchange acceleration is not working. Which three steps should you use to troubleshoot the problem? （）(Choose three.)

• A、Determine if CIFS acceleration is enabled.
• B、Determine if TCP Acceleration (AFP) is enabled.
• C、Determine if Forward Error Correction is enabled.
• D、Determine if any tunnel bounces occurred recently.
• E、Determine whether both Exchange server and clients are running version 2003.

第16题：

Which statement describes the below output from an MDS switch？（）    Flow ID. 44  Initiator VSAN： 200  Initiator WWN： 50：06：04：8a：cc：19：12：db  Target VSAN： 200  Target WWN： 50：06：04：8c：de：ad：be：ef  T arget LUN： ALL LUNs  Flow Verification Status：   -------------------------  Initiator Verification Status： success  Target Verification Status： WWN was not found in name server   Initiator Linecard Status： success  Target Linecard Status： Status not yet checked   Feature Status：   ---------------  Write-Acceleration enabled   Write-Acceleration Buffers： 1024  Configuration Status： flow verification failed       

• A、 The zone containing both the initiator and target does not exist
• B、 The zone set has not been activated
• C、 The target is not logged into the fabric
• D、 The pWWN used for the target is invalid

第17题：

Which Packet Flow Acceleration feature is most effective for short-lived TCP sessions?（）

• A、Active Flow Pipelining
• B、Fast Connection Setup
• C、TCP Acceleration (AFP)
• D、Forward Error Correction

第18题：

Which three types of optimization does the WX 60 device perform when Exchange 2000 and Outlook 2000 are used in the network? （）(Choose three.)

• A、Fast Connection Setup
• B、TCP Acceleration (AFP)
• C、Network Sequence Caching
• D、AppFlow's MAPI acceleration
• E、Molecular Sequence Reduction

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