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Implementing Cisco Service Provider Next-Generation Core Network Services

Question No: 61

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?

1. mpls ldp graceful-restart

   graceful-restart forwarding state-holdtime 5 graceful-restart reconnect-timeout 1 interface GigabitEthernet0/0/0/0

   !

2. mpls ldp graceful-restart

   graceful-restart forwarding state-holdtime 300 graceful-restart reconnect-timeout 60 interface GigabitEthernet0/0/0/0

   !

3. mpls ldp nsr

   graceful-restart

   graceful-restart forwarding state-holdtime 300 graceful-restart reconnect-timeout 60 interface GigabitEthernet0/0/0/0

   !

4. mpls ldp nsr

graceful-restart

graceful-restart forwarding state-holdtime 5 graceful-restart reconnect-timeout 1 interface GigabitEthernet0/0/0/0

!

Answer: B

Question No: 62

Which Cisco IOS XR command should be used in order to enable LDP on all interfaces for which the IGP protocol is enabled?

1. RP/0/0/CPU0:R1(config-ospf)#mpls ldp auto-config

2. RP/0/0/CPU0:R1(config-ospf)#mpls ldp interface all enable

3. RP/0/0/CPU0:R1(config-ospf)#enable all

4. RP/0/0/CPU0:R1(config-ldp)#enable all

Answer: A

Question No: 63

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.)

1. short pipe mode

2. uniform mode

3. pipe mode with an explicit NULL LSP

4. pipe mode without a explicit NULL LSP

5. best effort mode

Answer: A,C

Question No: 64

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?

1. tunnel endpoint

2. resource class affinity

3. MPLS label

4. IP address

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

Question No: 65

Which method maps MPLS EXP bit 5 to COS 5 on Cisco IOS XE?

1. configure terminal class-map match exp

   match mpls experimental topmost 5 exit

   policy-map EXP2Cos class exp

   set cos 5 exit

   class class-default random-detec

   interface fastethernet 0/0 service-policy output EXP2Cos

2. configure terminal

   class-map match exp

   match mpls experimental topmost 5 exit

   policy-map EXP2Cos class exp

   set cos 5 exit

   class class-default random-detec

   interface fastethernet 0/0 service-policy input EXP2Cos

3. configure terminal class-map match exp match mpls cos 5 exit

   policy-map EXP2Cos class exp

   set mpls experimental topmost 5 exit

   class class-default random-detec

   interface fastethernet 0/0 service-policy output EXP2Cos

4. configure terminal

   class-map match exp match mpls cos 5 exit

   policy-map EXP2Cos class exp

   set mpls experimental topmost 5 exit

   class class-default

   random-detec

   interface fastethernet 0/0 service-policy output EXP2Cos exit

   commit

5. configure terminal

ip access-list 101 permit ip any any mpls experimental 5 class-map match exp

match access-group 101 exit

policy-map EXP2Cos class exp

set cos 5 exit

class class-default random-detec

interface fastethernet 0/0 service-policy output EXP2Cos exit

Answer: A

Question No: 66

Refer to the exhibit. From which table was the information obtained?

1. FIB

2. CEF

3. LIB

4. LFIB

Answer: D

Question No: 67

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?

1. LDP Discovery

2. LDP auto-configuration

3. LDP graceful-restart

4. LDP NSF

Answer: C

Question No: 68

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?

1. rsvp

   interface interface-path-id bandwidth bandwidth

2. interface tunnel-te tunnel_id

   !

   bandwidth bandwidth

3. interface tunnel-te tunnel_id

   !

   signaled-bandwidth bandwidth

4. mpls traffic-eng

auto-bw collect frequency value

!

Answer: C

Question No: 69

On a Cisco router, when will the router actually reserve the bandwidth for the MPLS traffic engineering tunnel?

1. during the autoroute process

2. during constraint-based routing calculations

3. on the receipt of the RSVP Path message

4. on the receipt of the RSVP Resv message

Answer: D

Question No: 70

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?

1. allows for packets to be classified based on the ToS byte values before packet encryption

2. allows for packets to be classified based on the ToS byte values after packet encryption

3. allows for packets to be classified based on the packet payload before packet encryption

4. allows for packets to be classified based on the packet payload after packet encryption

5. allows for packets to be classified based on the packet header parameters other than the ToS byte values after packet encryption

Answer: E

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