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Q91. 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/
Q92. Refer to the exhibit.
A service provider is running MPLS TE across its network. IS-IS is deployed as the IGP for the ISP network. The MPLS TE tunnel 0 configured on PE2 is seen in an operational down state. PE2 is a level-1 router and the destination 192.168.1.1 is located in the IS-IS level-2 area. Which action is required to bring the MPLS TE tunnel 0 to up state?
A. Configure the next-address entries as loose paths in the explicit-path.
B. Change the autoroute option from destination to announce.
C. Configure a bandwidth value for the tunnel.
D. Configure an IPv4 address for the Tunnel 0.
E. Add a dynamic path option to the tunnel.
Answer: A
Q93. In a frame, the MPLS label is imposed where?
A. Before the layer 2 header
B. Within the Layer 3 header
C. After the Layer3 header and before Layer2 header
D. After the Layer2 header and before Layer3 header
Answer: D
Q94. A company is deciding between an HVR and SVR solution in order to finalize a virtualization project proposal. Which is an advantage of a HVR solution versus a SVR solution?
A. A HVR solution implements dedicated data plane resources.
B. A HVR solution implements shared control plane resources.
C. A HVR solution introduces significant contention of resources.
D. A HVR solution implements dedicated chassis resources.
Answer: A
Explanation:
Comparison of Virtualized Routing Architectures
Category Hardware-Isolated Virtual Router Software-Isolated Virtual Router
Control plane resources (CPU, memory)
Dedicated
Shared
Data plane resources (forwarding engine, queues)
Dedicated
Shared
Chassis resources (power supplies, blowers, fabric)
Shared
Shared
Management, configuration
Dedicated
Typically shared, but varies depending on degree of virtualization
Connections between virtualized routing entities
Typically external
Typically internal, but possibly external
Per-chassis scalability (routing adjacencies, prefixes)
Increased with additional logical routers
Unaffected by additional virtual routers
Reference: http://www.cisco.com/en/US/solutions/collateral/ns341/ns524/ns562/ns573/white_paper_c1 1-512753_ns573_Networking_Solutions_White_Paper.html
Q95. Refer to the exhibit. Router RT1 has three equal-cost paths back to the source. Which configuration should be applied in order to load-balance the multicast traffic across all three links.
A. Create three static multicast routes where each pointing out to one or three interfaces.
B. Enable PIM multipath.
C. Create a tunnel interface between RT1 and RT2. Enable PIM on the interface tunnel and disable PIM on the three interfaces part of equal-cost path between RT1 and RT2.
D. PIM load balance is not possible. PIM only chooses one interface for RFC check and prunes the other interfaces.
Answer: C
Explanation:
Reference: http://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/16450-mcastguide0.html
Q96. 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: C
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
Q97. A service provider is designing control policies at the customer edge of the network, in order to prevent usage that exceeds the contracted terms A new client that is contracted for only 2 Gbps is connecting to the service provider edge with a 10 Gbps interface. Which two OoS strategies meet the design goal? (Choose two.)
A. On the customer edge device, enable policing on the interface that is connected to the service provider.
B. On the service provider edge, enable WRED on the customer port.
C. On the customer edge, enable WRED on the interface that is connected to the service provider
D. I On the service provider edge, enable policing on the customer port
E. the customer edge device, enable traffic shaping on the interface that is connected to the service provider.
F. C On the service provider edge, enable traffic shaping on the customer port
Answer: D,E
Q98. 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
Q99. An engineer is deploying RTBH. What is necessary routing constraint required for successful implementation?
A. The trigger device must have an iBGP session with all the clusters/route reflectors in the autonomous system.
B. The trigger device must redistribute the static route pointing to a null interface into the IGP process.
C. The no ip reachables command must be issued on the PE router interface under attack.
D. The attacker’s destination IP address must be routed to a null interface.
E. The eBGP sessions need to set the next-hop attribute value to the trigger device loopback interface.
Answer: A
Explanation:
http://www.cisco.com/web/about/security/intelligence/ipv6_rtbh.html Old Dumps Actual Test pg no.52 (520 Q)
Q100. What are three main characteristics of mLDP that differ from RSVP-TE? (Choose three.)
A. The LSPs are built from tailend to headend.
B. The LSPs are built from headend to tailend.
C. It supports only P2MP LSPs.
D. It supports both P2MP and MP2MP LSPs.
E. Signaling is periodic.
F. No periodic signaling is performed.
Answer: A,D,F
Explanation: http://www.cisco.com/c/dam/en/us/products/ios-nx-os-software/multicast-label-distribution-protocol-mldp/whitepaper_c11-598929_v1.pdf
