Which configuration fulfills the requirement of configuring LDP with Cisco Nonstop
Forwarding on a router with 5 minutes time to hold the forwarding table information and 1 minute retry timer value for an LDP connection?
Answer : B
Which Cisco IOS XR command should be used in order to enable LDP on all interfaces for which the IGP protocol is enabled?
Answer : A
A service provider recently defined new SLA services that provide QoS transparency over
MPLS DiffServ-TE services. Which two tunneling modes provide QoS transparency?
(Choose two.)
Answer : A,C
When using the tunnel mpls traffic-eng path-option 1 explicit name test command in Cisco
MPLS TE tunnel configurations, the test explicit-path configuration will consist of a list of which values?
Answer : D
Explanation:
tunnel mpls traffic-eng path-option
To configure a path option for a Multiprotocol Label Switching (MPLS) traffic engineering tunnel, use the tunnel mpls traffic-eng path-option command in interface configuration mode. To disable the specified path option, use the no form of this command. tunnel mpls traffic-eng path-option number {dynamic | explicit {name path-name | path-number}} [lockdown] no tunnel mpls traffic-eng path-option number {dynamic | explicit {name path-name
| path-number}} [lockdown]
Syntax Description -
number = When multiple path options are configured, lower numbered options are preferred. dynamic = Path of the LSP is dynamically calculated. explicit = Path of the LSP is an IP explicit path. name path-name = Path name of the IP explicit path that the tunnel uses with this option. path-number = Path number of the IP explicit path that the tunnel uses with this option. lockdown = (Optional) The LSP cannot be reoptimized.
Usage Guidelines -
You can configure multiple path options for a single tunnel. For example, there can be several explicit path options and a dynamic option for one tunnel. Path setup preference is for lower (not higher) numbers, so option 1 is preferred.
Examples -
The following example shows how to configure the tunnel to use a named IP explicit path:
Router(config-if)# tunnel mpls traffic-eng path-option 1 explicit name test
Which method maps MPLS EXP bit 5 to COS 5 on Cisco IOS XE?
Answer : A
Refer to the exhibit. From which table was the information obtained?
Answer : D
An engineer is working in a service provider environment to troubleshoot a MPLS VPN.
The engineer determines that LDP neighborship is flapping between two routers and causing disruption to the traffic. Which LDP feature can help to solve the issue?
Answer : C
A network operations center requests support to configure a Cisco MPLS TE tunnel on a
Cisco IOS XR router. Which command sets a specific bandwidth required to the corresponding Cisco MPLS TE tunnel?
Answer : C
On a Cisco router, when will the router actually reserve the bandwidth for the MPLS traffic engineering tunnel?
Answer : D
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?
Answer : E
Which four options describe the functions of the control world in an AToM environment?
(Choose four.)
Answer : A,C,E,F
When configuring class-based WRED on Cisco routers, which WRED parameter is not user configurable on a Cisco IOS XR but is user configurable on a Cisco IOS and IOS XE?
Answer : D
Explanation:
Comparison of Cisco IOS QoS and Cisco IOS-XR QoS
The Cisco IOS-XR software implementation of QoS is basically the same as the QoS implementation on Cisco
IOS software, with the following exceptions:
On Cisco IOS-XR software, the bandwidth command can be configured only in egress policies.
The following changes have been made to the class-map command on Cisco IOS-XR software:
Supports 4K per logical router.
Maximum number of match criteria configurable in one class map is eight.
When a class is marked as high priority using the priority command on Cisco IOS-XR software, we recommend that you configure a policer to limit the priority traffic. Limiting the priority traffic will ensure that the priority traffic does not starve all of the other traffic on the line card. Use the police command to explicitly configure the policer.
On Cisco IO-XR software, only one conform-action, exceed-action, or violate-action command can be configured at a time. To configure traffic policing, use the police command.
On Cisco IOS-XR software, policy modifications cannot be made on existing policies. Use the policy-map command to remove the policy from all attached interfaces, delete the policy map, and redefine a new policy.
When configuring a policy map on Cisco IOS-XR software, the maximum number of classes configurable in one policy map is 16, which includes both Level 1 and Level 2 classes. To configure a policy map, use the policy-map command.
When WRED is configured on Cisco IOS-XR software, the mark probability in the random- detect command is not configurableit is always set to 1.
When the random-detect exp command is used on Cisco IOS-XR software, the exponential weighting constant is not configurable and will be programmed automatically by Cisco IOS-XR software.
When access control lists (ACLs) are used in QoS class maps, the underlying deny or permit actions associated with access control entries (ACEs) are ignored. ACEs are used as a classification mechanism in order to provide appropriate QoS behavior as specified in class maps. Use ACLs that include ACEs with permit actions only.
Which two statements are correct in describing ISP environments that are running IP/MPLS in the core network? (Choose two.)
Answer : B,D
Which three steps are required to configure QPPB on Cisco IOS XR routers? (Choose three.)
Answer : A,C,E
Explanation:
QoS Policy Propagation via BGP (QPPB), is a mechanism that allows propagation of quality of service (QoS) policy and classification by the sending party based on access lists, community lists and autonomous system paths in the Border Gateway Protocol
(BGP), thus helping to classify based on destination instead of source address.