Which two statements about the QoS functionality of the Cisc

第1题：

第2题：

Which two statements about voice VLANs are correct？（）

• A、Voice VLANs eliminate the need for QoS configuration
• B、Voice VLANs are used on trunk links to eliminate the need for QoS CoS markings
• C、Voice VLANs are mainly used to reduce the number of access switch ports that are used in the network
• D、Voice VLANs can be configured to forward existing CoS priorities or override them
• E、Voice VLANs are mainly used between access layer switches and distribution layer switches
• F、Voice VLANs can be configured on Layer 2 ports only

第3题：

第4题：

Which two statements are true about L2TP tunnels?（） (Choose two.)

• A、Traffic is clear text
• B、Traffic is encrypted 
• C、They are initiated by the LNS
• D、They are initiated by the LAC

第5题：

Which of these statements about FSPF is true？（）

• A、 It supports multipath routing
• B、 It can run any type of storage ports
• C、 When it is used， hop-by-hop routes are based only on the switch ID
• D、 When it is used， path status is based on the functionality of attached ports
• E、 It runs only on a switch fabric and cannot function in a VSAN

第6题：

Which two Cisco AutoQoS configuration statements are true？ （）

• A、the auto discovery qos command is supported on serial interfaces， subinterfaces， and virtual interfaces
• B、CEF must be enabled before configuring the auto discovery qos command
• C、the auto discovery qos privilege EXEC command must be configured on a router for several days to collect a sampling of data traffic
• D、the auto qos trust command relies on NBAR to provide VoIP classification
• E、the auto qos voip command configures the voip classification on routers and switches

第7题：

Which two statements or sets of statements are true about the application of the qos pre-classify command？（）

• A、 If the classification policy is based upon the ToS byte， the qos pre-classify command is required because the ToS byte only appears in the inner IP header.
• B、 The ToS byte is copied to the outer header by default. Therefore， the qos pre-classify command is not necessary.
• C、 With GRE encapsulation， the qos pre-classify command is applied on the tunnel interface. This practice allows for different OoS configurations on each tunnel.
• D、 With GRE encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.
• E、 With IPsec encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.

第8题：

第9题：

Which two statements are true about RSVP and the InServ QoS model？（）

• A、a drawback of implementing RSVP is the requirement to migrate to a supporting routing protocol
• B、RSVP uses DSCP to signal QoS requirements to routers 
• C、RSVP is a routing protocol
• D、RSVP is an IP protocol that uses IP protocol ID 46， and TCP/UDP ports 3455
• E、RSVP specifically provides a level of service for rate-sensitive and delay-sensitive traffic
• F、the flow-based approach of RSVP is ideal for large， scalable implementations such as the public internet

第10题：

Which two statements about the best effort model for QoS are true？（）

• A、delay sensitive packets are given preferential treatment
• B、the default policy identifies a delay sensitive class and default class
• C、the default policy identifies a delay sensitive class， best effort class， and default class
• D、the model is highly scalable
• E、the model is still predominant on the internet F the model provides guaranteed service