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Q41. What are the three primary components of NetFlow? (Choose three.) 

A. Flow caching 

B. A flow collector 

C. The data analyzer 

D. Flow sequence numbers 

E. Cisco Express Forwarding 

F. Multicast 

Answer: A,B,C 

Explanation: 

NetFlow includes three key components that perform the following capabilities: 

. Flow caching analyzes and collects IP data flows entering router or switch interfaces and prepares data for export. It enables the accumulation of data on flows with unique characteristics, such as IP addresses, application, and CoS. 

. FlowCollector and Data Analysis captures exported data from multiple routers and filters and aggregates the data according to customer policies, and then stores this summarized or aggregated data. Users can leverage Cisco NetFlow collector as a flow collector, or they can opt for a variety of third-party partner products. A Graphical user interface displays and analyzes NetFlow data collected from FlowCollector files. This allows users to complete near-real-time visualization or trending analysis of recorded and aggregated flow data. Users can specify the router and aggregation scheme and desired time interval. 

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-netflow/product_data_sheet0900aecd80173f71.html 

Q42. DRAG DROP 

Drag and drop the NHRP flag on the left to the corresponding meaning on the right. 

Answer: 

Q43. According to RFC 4577, OSPF for BGP/MPLS IP VPNs, when must the down bit be set? 

A. when an OSPF route is distributed from the PE to the CE, for Type 3 LSAs 

B. when an OSPF route is distributed from the PE to the CE, for Type 5 LSAs 

C. when an OSPF route is distributed from the PE to the CE, for Type 3 and Type 5 LSAs 

D. when an OSPF route is distributed from the PE to the CE, for all types of LSAs 

Answer:

Explanation: 

If an OSPF route is advertised from a PE router into an OSPF area, the Down bit (DN) is set. Another PE router in the same area does not redistribute this route into iBGP of the MPLS VPN network if down is set. 

RFC 4577 says: 

“When a type 3 LSA is sent from a PE router to a CE router, the DN bit in the LSA Options field MUST be set. This is used to ensure that if any CE router sends this type 3 LSA to a PE router, the PE router will not redistribute it further. When a PE router needs to distribute to a CE router a route that comes from a site outside the latter’s OSPF domain, the PE router presents itself as an ASBR (Autonomous System Border Router), and distributes the route in a type 5 LSA. The DN bit [OSPF-DN] MUST be set in these LSAs to ensure that they will be ignored by any other PE routers that receive them.” 

For more information about Down bit according to RFC 4577 please read more herE. http://tools.ietf.org/html/rfc4577#section-4.2.5.1. 

Q44. Refer to the exhibit. 

You are configuring the S1 switch for the switch port that connects to the client computer. Which configuration blocks users on the port from using more than 6 Mbps of traffic and marks the traffic for a class of service of 1? 

A) 

B) 

C) 

D) 

A. Exhibit A 

B. Exhibit B 

C. Exhibit C 

D. Exhibit D 

Answer:

Explanation: 

Only option A specified that the exceed and violate actions are set to drop for traffic over the CIR of 6 Mbps, and is also configured to set all traffic with a COS of 1 using the “set cos1” command. 

Q45. What is the VLAN ID range of VLANs that are eligible for pruning? 

A. 2 through 1001 

B. 1 through 1005 

C. 1 through 4096 

D. 2 through 1005 

Answer:

Q46. For which two conditions is Cisco Express Forwarding recursion disabled by default when the BGP Prefix Independent Convergence functionality is enabled? (Choose two.) 

A. next hops learned with a /24 mask 

B. next hops learned with any mask shorter than /32 

C. next hops learned with a /32 mask 

D. next hops that are directly connected 

Answer: C,D 

Explanation: 

Recursion is the ability to find the next longest matching path when the primary path goes down. When the BGP PIC feature is not installed, and if the next hop to a prefix fails, Cisco Express Forwarding finds the next path to reach the prefix by recursing through the FIB to find the next longest matching path to the prefix. This is useful if the next hop is multiple 

hops away and there is more than one way of reaching the next hop. 

However, with the BGP PIC feature, you may want to disable Cisco Express Forwarding recursion for the following reasons: 

. Recursion slows down convergence when Cisco Express Forwarding searches all the FIB entries. 

. BGP PIC Edge already precomputes an alternate path, thus eliminating the need for Cisco Express Forwarding recursion. 

When the BGP PIC functionality is enabled, Cisco Express Forwarding recursion is disabled by default for two conditions: 

. For next hops learned with a /32 network mask (host routes) 

. For next hops that are directly connected 

For all other cases, Cisco Express Forwarding recursion is enabled. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/irg-bgp-mp-pic.html 

Q47. Refer to the exhibit. 

Which three statements about the R1 configuration are true? (Choose three.) 

A. The virtual circuit identifier is 1611 and the virtual circuit is down. 

B. The local label for the circuit is 4006. 

C. The targeted LDP session to the remote peer is up. 

D. The local label for the circuit is 1611. 

E. The virtual circuit identifier is 4006 and the virtual circuit is down. 

F. The circuit is using MPLS VC type 4. 

Answer: A,B,C 

Explanation: 

The number after the vc is the identifier, which is 1611 in this case. Here, the VC status is shown as down. 

As shown, the MPLS VC labels: local 4006, remote unassigned shows the local label used is 4006. 

The targeted LDP session is up as verified by the “Signalling protocol: LDP, peer 172.16.12.70 up” statement in the output. 

Q48. Which option is the result if two adjacent routers are configured for OSPF with different process IDs? 

A. The routers are unable to establish an adjacency. 

B. The routers establish an adjacency, but route exchange fails. 

C. The routers establish an adjacency and exchange routes, but the routes are unreachable. 

D. The routers establish an adjacency and exchange routes, and the routes are reachable. 

Answer:

Q49. Which IPv6 prefix is used for 6to4 tunnel addresses? 

A. 2001::/23 

B. 2002::/16 

C. 3ffe::/16 

D. 5f00::/8 

E. 2001::/32 

Answer:

Explanation: 

6to4 works by taking advantage of a reserved IPv6 prefix, 2002::/16. A 6to4 tunnel interface automatically converts the 32 bits in its IPv6 address following this prefix to a global unicast IPv4 address for transport across an IPv4 network such as the public Internet. 

Reference: http://packetlife.net/blog/2010/mar/15/6to4-ipv6-tunneling/ 

Q50. Which two values comprise the VPN ID for an MPLS VPN? (Choose two.) 

A. an OUI 

B. a VPN index 

C. a route distinguisher 

D. a 16-bit AS number 

E. a 32-bit IP address 

Answer: A,B 

Explanation: 

Each MPLS VPN ID defined by RFC 2685 consists of the following elements: 

. An Organizational Unique Identifier (OUI), a three-octet hex number: The IEEE Registration Authority assigns OUIs to any company that manufactures 

components under the ISO/IEC 8802 standard. The OUI is used to generate universal LAN MAC addresses and protocol identifiers for use in local and metropolitan area network applications. For example, an OUI for Cisco Systems is 00-03-6B (hex). 

. A Virtual Private Network (VPN) index: a four-octet hex number, which identifies the VPN within the company. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l3_vpns/configuration/15-mt/mp-l3-vpns-15-mt-book/mp-assgn-id-vpn.html