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Q51. Refer to the exhibit.
A service provider has multiple time sources in the environment for NTP. The time source at 10.0.4.1 is intended to be seen as a primary time source. What command can be issued on PE4 to fix the configuration, ensuring the proper NTP source will be issued?
A. ntp peer 10.0.4.1
B. ntp peer 10.0.4.1 prefer
C. ntp server 10.0.4.1 source GigabitEthernet0/0
D. ntp server 10.0.4.1 prefer
Q52. Which QoS DiffServ mode preserves the original customer IP marking besides of on egress PE router uses the DSCP value of this IP packet on outbound queuing?
A. MPLS PHB mode
B. Pipe mode
C. IntServ mode
D. Uniform mode
E. Short-Pipe mode
Q53. What are two advantages of Cisco IOS XR Software over Cisco IOS Software? (Choose two.)
A. a configuration that is grouped by interface
B. a configuration that is grouped by process
C. one-stage configuration
D. a monolithic OS
E. a two-stage configuration
Q54. Which are the two advantages if an ISP chooses a platform that runs Cisco IOS-XR Software instead of Cisco IOS Software? (Choose two.)
A. Cisco IOS XR Software functions as a message-passing operating system.
B. The system's scheduler is priority-based.
C. He context switching is based on Cisco Express Forwarding.
D. VoIP traffic is hardware-processed for real-time response.
E. Communication between client and server is realized by a dedicated mechanism.
Q55. Two Service Providers are beginning a merger between AS boundaries to provide MPLS-enabled services between their networks. Customers are using both Service Providers for services and, under certain circumstances; there are requirements to extend Layer 2 VPN circuits between each provider. The providers are in the process of completing the technical merger. However, the MPLS is not supported between the providers. Which action allows MPLS Layer 2 VPN circuits to be built over the inter-AS link?
A. Create a GRE tunnel with the mpls ip command between ASBRs.
B. Create Layer 2 VPN peerings between PE routers from each provider.
C. Create a VPNv4 peering between ASBRs to advertise labels between each provider.
D. Create a sham link between ASBR routers to enable a superbackbone peering for Layer 2 VPN signaling.
Q56. An IS-IS enabled router with multiple IS-IS neighbors is required to have BFD sessions with all neighbors. Which BFD mode should you use when you want to save the overhead of periodic protocol control packets?
Explanation: https://tools.ietf.org/html/rfc5880#section-3.1 RFC - 5880
Q57. Which Cisco IOS XR Virtualization technology provides full isolation between virtualized routing instances for extra control plane resources?
Q58. 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.
Q59. The following MPP configuration is applied on RA router: RP/0/RSP0/CPU0:RA#sh running-config control-plane
interface TenGigE 0/0/0/0
allow SSH peer
address ipv4 188.8.131.52/8
Which two pieces of information are correct in regards to management traffic on RA router? (Choose two)
A. SNMP traps going out on TenGigE 0/0/0/0 interface are dropped.
B. SNMP polling coming through TenGigE 0/0/0/0 interface are dropped.
C. Telnet connections coming through MgmtEth0/RSP0/CPU0/0 interface are accepted.
D. SSH connections coming through TenGigE 0/0/0/0 interface from 184.108.40.206 host are accepted.
E. TACACS traffic going through TenGigE 0/0/0/0 interface are dropped.
Q60. What are the four key design requirements for mobile IP backhaul? (Choose four.)
A. X2 interface turning point
C. Layer 2 Tunneling
D. native IPv6 support
F. MPLS-enabled interface
G. network timing distribution and recovery
H. mandatory Layer 3 access up to a cell site