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Q41. What are three actions that the control word performs in MPLS AToM? (Choose three.) 

A. is used to identify the VC label 

B. is used for padding small packets 

C. preserves the sequence of the transported frames 

D. facilitates the load balancing of AToM packets in the MPLS backbone network 

E. carries control bits of the Layer 3 header of the transported protocol 

F. is used to identify the tunnel label 

Answer: B,C,D 

Explanation: https://ccdewiki.wordpress.com/2013/05/28/control-word-on-atom/ 


Q42. An support engineer has been tasked to protect an ISP infrastructure from the growing number of encrypted DDoS attacks. The solution should also validate the eBGP peering. Which solution accomplishes these goals? 

A. BGP FlowSpec 

B. BTSH 

C. BGP Route Dampening 

D. BGP LS 

E. RTBH 

Answer:


Q43. Refer to the exhibit. 

Which VLAN interface does untagged traffic pass through? 

A. 1 

B. 2 

C. 3 

D. 4 

Answer:


Q44. An engineer is troubleshooting L3VPN traffic loss over the MPLS-enabled core network when new core links were enabled. Assuming that the IGP is properly configured, which issue causes a temporary data flow blackholing when the IGP and LDP reconvenes? 

A. LDP is a Layer 2 protocol forwarding label packets before the IGP reconvened. 

B. IP packets are forwarded as soon as routes are learned over a new IGP adjacency before the label exchange happens over the new links 

C. MP-BGP sessions between PE and RR routers require extra time to reconverge than the underlying IGP. 

D. MPLS-TE tunnels without LDP adjacencies are used over the new links black-holing the traffic before the LDP label exchange is completed 

Answer:


Q45. A network engineer needs to connect two core switches that use Gigabit Ethernet interfaces in an MPLS backbone and that are separated by a distance of 60 km. Which Cisco GBIC achieves this goal? 

A. Cisco 1000BASE-T GBIC 

B. Cisco 1000BASE-SX GBIC 

C. Cisco 1000BASE-LX/LH GBIC 

D. Cisco 1000BASE-ZX GBIC 

Answer:

Explanation: 

http://www.cisco.com/web/partners/downloads/765/tools/quickreference/gbic.pdf 


Q46. Which is the main characteristic of LTE architecture compared to other mobile architectures? 

A. Provides supports to deploy Layer 3 MPLS VPN model, where other mobile architectures do not support. 

B. Offers node redundancy with the static route configured on the IP NodeB using the HSRP/VRRP virtual ip address. 

C. Provides a simpler, less hierarchical model with the capability of simplistically distributing the core gateways. 

D. Introduces a hierarchical model with connection-oriented service requirements and one-to-one relationships. 

Answer:

Explanation: https://books.google.co.in/books?id=-fyjBAAAQBAJ&pg=PA50&lpg=PA50&dq=LTE+Provides+a+simpler,+less+hierarchical+mo del+with+the+capability+of+simplistically+distributing+the+core+gateways.&source=bl&ots =Bwpk3CQ_jN&sig=2-kgrCA_7hEX3kuvSxWVV2AnAS0&hl=en&sa=X&ved=0CB0Q6AEwAGoVChMI_5La8tbCx wIVgZ6OCh1N7gHa#v=onepage&q=LTE%20Provides%20a%20simpler%2C%20less%20 hierarchical%20model%20with%20the%20capability%20of%20simplistically%20distributing %20the%20core%20gateways.&f=false 


Q47. DRAG DROP 

Drag and drop the MPLS operation listed on the left to the correct order of the operation on the right. 

Answer: 


Q48. A Service Provider connects to a client site that has two CEs. These CEs have a backdoor link for backup. OSPF is used as the routing protocol in this environment. You want to ensure that client traffic prefers the service provider connections for routing instead of the secondary connection. Which option describes the default behavior and the action that accomplishes your goal? 

A. The routes to the Service Provider are not preferred, due to the increased OSPF cost through the service provider network. Ensure that the cost on the links to the service provider are lower than the secondary connection. 

B. The routes to the Service Provider are seen as external type 1 in the OSPF database. Configure a domain ID that is the same across all PEs, to ensure that customers see routes as intra-area. 

C. The routes to the Service Provider are seen as inter-area OSPF routes through the network. Configure a sham link to create a new intra-area path across the service provider network between the PE routers that service the client. 

D. The routes to the Service Provider are seen as equal and cause nondeterministic traffic patterns. Ensure that the secondary connection has a higher cost than the links to the service provider. 

Answer:

Explanation: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-sy/iro-15-sy-book/iro-sham-link.html#GUID-BEA06826-713E-4F71-B4A4-9E3DA3BAC3FC 


Q49. Refer to the exhibit. A customer is running IS-IS within a network and is using BGP as a CE-PE routing protocol. Which action allows CE1 to get the subnet 10.10.2.0/24 over the CE1-PE1 link, regardless of whether there is a flap in the MPLS link or backdoor link? 

A. Configure the neighbor <PE1-IP>weight 33768 command on CE1 under the BGP process. 

B. Configure the distance bgp 115 200 200 command on CE1 under the BGP process. 

C. Configure the distance 30 ip command on CE1 under the IS-IS process. 

D. Configure the distance bgp 115 200 200 command on CE2 under the BGP process. 

E. Configure the neighbor <PE1-IP>weight 33768 command on CE2 under the BGP process. 

Answer:


Q50. Which are two major changes SyncE offers over traditional Ethernet to make it suitable for clock distribution? (Choose two.) 

A. SyncE introduces the concept of “Boundary Clocks” and “Transparent Clocks” improving network scalability and accuracy of clock synchronization. 

B. Industry standard that guarantee interoperability, since granular details, such as specific field values are specified. 

C. A mandated clock accuracy of 4.6ppm. 

D. The ESMC protocol for clock selection, distribution, management, traceability, and failover. 

E. High-priority synchronization packets so it can continually adjust its own oscillator. 

Answer: C,D 

Explanation: http://www.cisco.com/c/en/us/support/docs/optical/synchronous-optical-network-sonet/23718-timefaq-23718.html 

http://cp.literature.agilent.com/litweb/pdf/5990-4386EN.pdf