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Question 67/100
The Cisco IOS and IOS XE qos pre-classify command allows which kind of packet classification on IP packets that are encapsulated with GRE and IPsec?
Correct Answer: A
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a008017405e.
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The qos pre-classify command
When packets are encapsulated by tunnel or encryption headers, QoS features are unable to examine the original packet headers and correctly classify the packets. Packets traveling across the same tunnel have the same tunnel headers, so the packets are treated identically if the physical interface is congested. With the introduction of the Quality of Service for Virtual Private Networks (VPNs) feature, packets can now be classified before tunneling and encryption occur.
In this example, tunnel0 is the tunnel name. The qos pre-classify command enables the QoS for VPNs feature on tunnel0:
Router(config)# interface tunnel0
Router(config-if)# qos pre-classify
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The qos pre-classify command
When packets are encapsulated by tunnel or encryption headers, QoS features are unable to examine the original packet headers and correctly classify the packets. Packets traveling across the same tunnel have the same tunnel headers, so the packets are treated identically if the physical interface is congested. With the introduction of the Quality of Service for Virtual Private Networks (VPNs) feature, packets can now be classified before tunneling and encryption occur.
In this example, tunnel0 is the tunnel name. The qos pre-classify command enables the QoS for VPNs feature on tunnel0:
Router(config)# interface tunnel0
Router(config-if)# qos pre-classify
- Question List (100q)
- Question 1: Which two interface types can support qos pre-classify (Choo...
- Question 2: Which three conditions can occur when metering traffic using...
- Question 3: Refer to the exhibit. (Exhibit) What is the available reserv...
- Question 4: Which are typical class-based marking policies that are impl...
- Question 5: Refer to the exhibit. (Exhibit) IT administrators report pac...
- Question 6: A recent analysis of a service provider network infrastructu...
- Question 7: Which IOS XR Software feature supports establishing point-to...
- Question 8: Which Cisco IOS XR command should be used to identify if MPL...
- Question 9: Refer to the exhibit. From which table was the information o...
- Question 10: Which QoS technique can be used to protect customer traffic ...
- Question 11: The network architecture team is proposing to enable Cisco M...
- Question 12: Scenario: (Exhibit) On PE7 which statement is correct regard...
- Question 13: Which two options are able to perform the MPLS label distrib...
- Question 14: Which four options are methods by which labels can be assign...
- Question 15: Referring to the Cisco IOS XR show command output exhibit, (...
- Question 16: A network engineer must design a core network routing domain...
- Question 17: How is bandwidth recalculated when utilizing the automatic b...
- Question 18: Which feature should you configure to enable routers to main...
- Question 19: An LDP session is established between two neighbors. Over wh...
- Question 20: An engineer is having a problem getting an operational 10 Gi...
- Question 21: Within the service provider core network, which two QoS mech...
- Question 22: Scenario: (Exhibit) On the PE8-router what is the label valu...
- Question 23: What is a crucial LDP default operating behavior?...
- Question 24: Refer to the exhibit. (Exhibit) Which two commands can be us...
- Question 25: Which protocol is used to send MPLS OAM traffic over an MPLS...
- Question 26: Which configuration fulfills the requirement of configuring ...
- Question 27: Which affinity value will be matched by the affinity bit mas...
- Question 28: When implementing MPLS DS-TE on Cisco IOS XR routers, all ag...
- Question 29: When troubleshooting LDP operations on the Cisco IOS and IOS...
- Question 30: When using the tunnel mpls traffic-eng path-option 1 explici...
- Question 31: At which layer does Cisco recommend the QoS trust boundary b...
- Question 32: An engineer is setting up a routing instance to route the tr...
- Question 33: Which option describes the IPv6 flow label field?...
- Question 34: Scenario: (Exhibit) On CE 7 router, which statement is corre...
- Question 35: According to the Intserv model, which two options are traffi...
- Question 36: Refer to the Cisco IOS XR configuration exhibit. (Exhibit) W...
- Question 37: What is an important requirement with MPLS applications like...
- Question 38: What is the term that is used for the label that an LSR assi...
- Question 39: Which option is the appropriate way to configure a color-awa...
- Question 40: A company asks an engineer to provide an explanation for imp...
- Question 41: Referring to the show output exhibit, which statement is cor...
- Question 42: Which two features are used to provide Cisco MPLS TE node an...
- Question 43: Which two traffic types are recognized by NBAR default confi...
- Question 44: Which class-map configuration selects the following traffic?...
- Question 45: An engineer has been tasked to configure a guaranteed 2 Mbps...
- Question 46: An engineer is tasked to deploy Fast Reroute for Cisco MPLS ...
- Question 47: DRAG DROP (Exhibit)
- Question 48: In an IPv6 header, what does a flow label of zero indicate?...
- Question 49: Which configuration can a network engineer use to establish ...
- Question 50: When implementing MPLS TE tunnels on Cisco IOS XR routers, w...
- Question 51: A network architect recently deployed AToM solutions for lar...
- Question 52: Scenario: (Exhibit) After reviewing present router configura...
- Question 53: Which driver uses an IntServ QoS model in an MPLS TE enabled...
- Question 54: Which option is the correct definition of the LB on a Cisco ...
- Question 55: Which three statements are correct regarding ping mpls comma...
- Question 56: Refer to the exhibit. (Exhibit) MPLS TE Tunnel 138 has a hea...
- Question 57: Which option is a Cisco-recommended congestion management or...
- Question 58: Cisco MPLS TE tunnels recently have been deployed to minimiz...
- Question 59: Which two fields are in the traffic engineering topology dat...
- Question 60: Which statement describes the QoS behavior between P and PE ...
- Question 61: Which three fields must be the same in an IPv6 header to con...
- Question 62: An engineer is deploying CB-WRED across the entire core netw...
- Question 63: With unmanaged CE routers, at which point in the service pro...
- Question 64: What is the function of MPLS FRR?...
- Question 65: Which two protocols facilitate label bindings by neighboring...
- Question 66: When a link flaps, an mpls ldp session will also flap. Which...
- Question 67: The Cisco IOS and IOS XE qos pre-classify command allows whi...
- Question 68: An engineer must automatically copy the IP Prec/DiffServ PHB...
- Question 69: When configuring class-based WRED on Cisco routers, which WR...
- Question 70: Which of the following three statements are correct regardin...
- Question 71: An engineer is allocating a determined amount of bandwidth t...
- Question 72: On Cisco routers, which QoS marker is only locally significa...
- Question 73: Which four options describe the functions of the control wor...
- Question 74: Refer to the partial Cisco IOS XR configurations exhibit for...
- Question 75: On a Cisco IOS XR router, which mechanism protects the route...
- Question 76: On the Cisco IOS XR, which MQC configuration is different th...
- Question 77: In which two Cisco IOS XR configuration modes can mpls ldp i...
- Question 78: An engineer sets up QoS over MPLS networks. How many classes...
- Question 79: Which three options can an engineer select for a traffic pol...
- Question 80: Refer to the exhibit. Which configuration error prevents thi...
- Question 81: Which option describes the function of an IPv6 flow label?...
- Question 82: An engineer must configure a policy on a Cisco IOS XE router...
- Question 83: Which option is the appropriate method for CBWFQ WRED implem...
- Question 84: In Cisco IOS, what must be configured to ensure that an MPLS...
- Question 85: Which two values must be specified in a Cisco NBAR configura...
- Question 86: Refer to the exhibit. What happens to the traffic that excee...
- Question 87: DRAG DROP You create an MPLS TE tunnel in IOS XR Software an...
- Question 88: An engineer has been tasked to configure a guaranteed 10 Mbp...
- Question 89: Referring to the Cisco IOS XR configuration exhibit, (Exhibi...
- Question 90: An engineer deployed a Cisco MPLS TE next-hop protection ove...
- Question 91: DRAG DROP (Exhibit)
- Question 92: On Cisco routers, which three methods can be used to map tra...
- Question 93: LDP session protection uses which one to maintain the LDP se...
- Question 94: Refer to the Cisco IOS XR policy-map configuration exhibit. ...
- Question 95: Layer 2 VPN services that are offered by traditional service...
- Question 96: Refer to the exhibit. (Exhibit) Based on the raw format of a...
- Question 97: In Cisco MPLS TE implementations, what can cause the tunnel ...
- Question 98: Which Cisco IOS XR high-availability feature is used to prev...
- Question 99: Refer to the exhibit. (Exhibit) While configuring traffic sh...
- Question 100: Which four pieces of information are stored for each prefix ...
