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2021 Sep 400 wood road 201-g snowmass village co 81615:

Q11. Which are the two fundamental ways in which IEEE 1588 differs from SyncE? (Choose two.) 

A. In addition to frequency synchronization, it achieves ToD synchronization to achieve phase alignment which is required for multi-channel communication. 

B. It is a purely-based solution, with the actual clock values being passed inside the payloads of special packets dedicated to that task. 

C. It offers two major changes over traditional Ethernet to make it suitable for clock distribution: a mandated clock accuracy and the ESMC protocol for clock selection, distribution, management, traceability, and failover. 

D. SyncE is a Cisco proprietary ToD technology where IEEE 1588 is a industry standard recommended for interoperability across vendor devices. 

E. IEEE 1588 applies to voice-only systems or with low-bandwidth data traffic. 

Answer: A,B 

Explanation: http://www.eetimes.com/document.asp?doc_id=1278660 


Q12. Refer to the exhibit. 


In the topology, networks in VRF A use the service provider network for transport. PE1 and PE2 run MP-BGP VPNv4 peering. Links between PE and P routers have MPLS enabled. Links between R1 and P routers do not support MPLS. 

Which technology can be implemented to build MPLS services between P1 and P2? 

A. Layer 3 VPN over GRE Tunnels 

B. L2TPv3 

C. RSVP Signaled Tunneling 

D. MPLS LDP Tunnels 

E. MPLS TE 

Answer: B 


Q13. Refer to the exhibit. 


The vrf MAINT has been provisioned and used by the Service Provider management network. The engineer discovers that syslog messages are not being received on the syslog server. IP reachability has been validated using ping. Which issue in the configuration must be corrected? 

A. logging on must include the vrf MAINT keyword. 

B. logging host must include the vrf MAINT keyword. 

C. The logging facility must be configured for syslog processing. 

D. The route targets that are configured do not match the route distinguisher. 

Answer: B 

Explanation: 

http://www.cisco.com/c/en/us/td/docs/ios/12_2sr/12_2sra/feature/guide/srvrfslg.html#wp10 59076 


Q14. A MPP has been implemented in a Cisco IOS-XR device. Which are the two results that will occur? (Choose two.) 

A. If MPP is disabled and a protocol is activated, all interfaces cannot pass traffic 

B. MPP configuration changes doesn't affect active sessions established before the changes 

C. RP/DRP Ethernet Interfaces are not default out-of-band interfaces 

D. Management traffic to RP from all non-MPP interfaces is dropped 

E. Interfaces configured for out-of-band MPP are still part of global routing/forwarding 

Answer: B,D 


Q15. In a Layer 2 VPN service, which is the default behavior of an EVC-based platform with regards to VLAN manipulation? 

A. keeps the VLAN tag of the incoming frame 

B. attaches two VLAN tags to the incoming frame 

C. removes the VLAN tag from the incoming frame 

D. removes all the VLAN tags from the incoming frame 

E. sets the VLAN tag of the incoming frame 

Answer: A 

Explanation: http://www.cisco.com/c/en/us/support/docs/routers/asr-9000-series-aggregation-services-routers/116453-technote-ios-xr-l2vpn-00.html#anc7 


400-201 vce

Refresh 201-400:

Q16. Which is the RP address of the IPv6 multicast address FF76:0:130:1234:5678:9abc::4321? 

A. 4321:5678:9abc::30 

B. 4321:5678:9abc::13 

C. 1234:5678:9abc::130 

D. 1234:5678:9abc::1 

E. 1234:5678:9abc::13 

Answer: D 

Explanation: Reference: 

http://www.netcraftsmen.com/wp-content/uploads/2014/12/20090429-CMU-Introduction_to_IP_Multicast.pdf page 53 


Q17. What is the minimum hardware configuration of the multishelf Cisco CRS-1 system? 

A. One route processor (RP) card and one modular services card (MSC) 

B. One distributed route processor (DRP) and one S13 fabric card (SFC) 

C. One line card chassis (LCC) and one fabric card chassis (FCC) 

D. One route processor (RP) and one fabric card chassis (FCC) 

E. One line card chassis (LCC) and one S13 fabric card (SFC) 

Answer: C 

Explanation: 

1.4. SP high end product 

A minimum of one LCC and one FCC are required to configure a multishelf system. 


Q18. A network engineer is responsible for implementing a solution with Cisco IOS XR Software that ensures continuous forwarding during a control plane failure. Which two technologies should the engineer consider? (Choose two.) 

A. IP FRR 

B. NSR 

C. graceful restart 

D. BFD 

E. TE FRR 

Answer: B,C 


Q19. Which two statements about 10 Gigabit Ethernet WAN PHY mode are true? (Choose two.) 

A. The signal maps to an OC-192c/STM-64c payload. 

B. The nominal speed is 9.95328 Gbps. 

C. It is compatible with Packet Ethernet over SONET. 

D. The signal maps to an OC-768c/STM-256c payload. 

E. It is compatible with Packet over SONET. 

F. The nominal speed is 10.3125 Gbps. 

Answer: A,B 

Explanation: https://en.wikipedia.org/wiki/10_Gigabit_Ethernet 


Q20. A service provider is implementing Ethernet solutions for clients that are not being provisioned within the MPLS core network. Which solution allows the Service Provider to complete Ethernet circuit provisioning in this scenario? 

A. L2TPv3 

B. VPLS 

C. AToM 

D. PPPoE 

Answer: A 

Explanation: 

L2TPv3 defines the L2TP protocol for tunneling Layer 2 payloads over an IP core network using Layer 2 virtual private networks (VPNs). Benefits of this feature include the following: 

. Simplifies deployment of VPNs. 

. Does not require Multiprotocol Label Switching (MPLS) virtual private network (VPN). 

. Supports Layer 2 tunneling over IP for any payload. 

. Supports data encapsulation directly over IP (IP protocol number 115), not using User Datagram Protocol (UDP) . 

Supports point-to-point sessions, not point-to-multipoint or multipoint-to-point sessions . 

Supports sessions between the same Layer 2 protocols, for example Frame Relay-to-Frame Relay or ATM-to-ATM.