What are two purposes of a forwarding class?（）A、to rewrite the ToS bits in the IP headerB、to classify trafficC、to identify traffic that should receive commom treatmentD、to assign traffic to output queues

第1题：

Which two statements are true about traffic shaping and traffic policing？（）

• A、both traffic shaping and traffic policing cause retransmissions of connection-oriented protocols such as TCP
• B、both traffic shaping and traffic policing support the marking and re-marking of traffic
• C、the effects of traffic shaping and traffic policing when configured on a router are applied to outgoing traffic
• D、traffic shaping queues excess traffic whereas traffic policing discards excess traffic
• E、traffic shaping allows the traffic to exceed the bit rate whereas traffic policing prevents the traffic from exceeding the bit rate

第2题：

Which QoS preclassification option will require the use of the qos pre-classify command for the VPN traffic？ （）

• A、VPN traffic needs to be classified based on the Layer2 header information
• B、VPN traffic needs to be classified based on the IP precedence or DSCP
• C、VPN traffic needs to be classified based on IP flow or Layer 3 information， such as source and destination IP address
• D、VPN traffic with Authentication Header （AH） needs to preserve the ToS byte

第3题：

What are two functions associated with JUNOS software class of service?（）

• A、Manage ingress bandwidth.
• B、Mark packets for special handling.
• C、Manage congestion by intelligently dropping traffic.
• D、Classify Frame Relay QoS packets into an equivalent IP CoS environment.

第4题：

What are two steps needed to define a QoS policy for a traffic class？（）

• A、 Determine a minimum bandwidth guarantee.
• B、 Determine interfaces to which to apply policy.
• C、 Assign priorities to the class.
• D、 Configure access control lists.

第5题：

Which two statements correctly identify factors to consider when Configuring WAN QoS？（）

• A、Voice Traffic uses Assured Forwarding
• B、Voice Signaling traffic uses Assured Forwarding
• C、Voice Signaling traffic uses priority queuing
• D、Voice Traffic uses priority queuing
• E、Voice signaling traffic should use priority queuing with Assured Forwarding

第6题：

Which two configurations are made using the QoS Setup Wizard? （）(Choose two.)

• A、Assign applications to traffic classes.
• B、Use ToS/DSCP values for traffic classes.
• C、Exclude subnets from QoS management.
• D、Select dedicated vs. over-subscribed circuits.

第7题：

What is the purpose of unicast reverse path forwarding?（）

• A、to validate packet receipt on interfaces where the traffic should be received
• B、to forward packets out the interfaces where the traffic should be received
• C、to forward packets out the interfaces where the traffic should be sent
• D、to validate packet receipt on interfaces where the traffic should be sent

第8题：

What are the contents of a scheduler?（）

• A、A scheduler contains parameters that describe how a queue should be serviced.
• B、A scheduler contains traffic that is ready to be transmitted.
• C、A scheduler contains forwarding classes that allow traffic to be forwarded.
• D、A scheduler contains a map between the classification of a packet and its forwarding class.

第9题：

What are two purposes of a forwarding class?（）

• A、to identify traffic that should be dropped
• B、to classify traffic
• C、to identify traffic that should receive common treatment
• D、to assign traffic to output queues

第10题：

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第13题：

What are two step needed to define a QoS policy for a traffic class？（）

• A、determine a minimum bandwidth guarantee
• B、determine interfaces to which to apply policy
• C、assign priorities to the class
• D、configure access control lists

第14题：

In which two ways can you influence how downstream LSRs treat MPLS traffic？（）

• A、Use an EXP rewrite table.
• B、Use a DSCP rewrite table.
• C、Statically assign a CoS value to an LDP-signaled LSP
• D、Statically assign a CoS value to an RSVP-signlated LSP

第15题：

What is the default Quality of Service traffic class used by the ERX Edge Router?（）

• A、bronze forwarding
• B、assured forwarding
• C、expedited forwarding
• D、best effort forwarding

第16题：

On the basis of the definitions of different services in various RFCs， traffic with Expedited Forwarding per-hop behavior should be marked as which of these？（）

• A、IP ToS of 0xEF
• B、IP experimental ECN
• C、DSCP decimal 5
• D、Binary value of 101110

第17题：

What is the use of ERSPAN on N1kv？（）  

• A、 Send monitored traffic to a VLAN
• B、 Send monitored traffic to a remote VEM over L2
• C、 Receive monitored traffic on a vEthernet interface
• D、 Send monitored traffic to an IP destination

第18题：

What are two functions associated with JUNOS software class of service？（）

• A、Log incoming traffic.
• B、Manage ingress bandwidth.
• C、Mark packets for special handling.
• D、Manage congestion by intelligently dropping traffic.
• E、Classify Frame Relay QoS packets into an equivalent OP CoS environment.

第19题：

In which two ways can you influence how downstream LSRs treat MPLS traffic?（）

• A、Use an EXP rewrite table.
• B、Use a DSCP rewrite table.
• C、Statically assign a CoS value to an LDP-signaled LSP.
• D、Statically assign a CoS value to an RSVP-signaled LSP.

第20题：

What are three functions associated with JUNOS software class of service?（）

• A、Log incoming traffic.
• B、Classify incoming packets.
• C、Manage outbound bandwidth.
• D、Manage congestion by intelligently dropping traffic.
• E、Classify ATM QoS packets into an equivalent IP CoS environment.

第21题：

You need to identify the types of inbound traffic that should pass through the perimeter firewall while maintaining the security of the network. Which inbound traffic should be allowed?（）

• A、VPN Traffic
• B、DNS Traffic
• C、LDAP Traffic
• D、HTTP Traffic
• E、HTTPS Traffic
• F、Traffic from the network address of 192.168.10/24

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第23题：