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Q291. DRAG DROP 

Drag each spanning-tree feature on the left to the matching statement on the right. 

Answer: 


Q292. DRAG DROP 

Drag and drop each STP port role on the left to the matching statement on the right. 

Answer: 


Q293. Which option describes a limitation of Embedded Packet Capture? 

A. It can capture data only on physical interfaces and subinterfaces. 

B. It can store only packet data. 

C. It can capture multicast packets only on ingress. 

D. It can capture multicast packets only on egress. 

Answer:

Explanation: 

Restrictions for Embedded Packet Capture 

. In Cisco IOS Release 12.2(33)SRE, EPC is supported only on 7200 platform. 

. EPC only captures multicast packets on ingress and does not capture the replicated packets on egress. 

. Currently, the capture file can only be exported off the device; for example, TFTP or FTP servers and local disk. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/epc/configuration/15-mt/epc-15-mt-book/nm-packet-capture.html 


Q294. DRAG DROP 

Drag and drop the SNMP element on the left to the corresponding definition on the right. 

Answer: 


Q295. Refer to the exhibit. 

Which configuration must you apply to router R2 to enable BFD?

A) 

B) 

C) 

D) 

A. Exhibit A 

B. Exhibit B 

C. Exhibit C 

D. Exhibit D 

Answer:


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Q296. Which two statements about Cisco Express Forwarding are true? (Choose two.) 

A. Cisco Express Forwarding tables contain reachability information and adjacency tables contain forwarding information. 

B. Cisco Express Forwarding tables contain forwarding information and adjacency tables contain reachability information. 

C. Changing MAC header rewrite strings requires cache validation. 

D. Adjacency tables and Cisco Express Forwarding tables can be built separately. 

E. Adjacency tables and Cisco Express Forwarding tables require packet process-switching. 

Answer: A,D 

Explanation: 

Main Components of CEF 

Information conventionally stored in a route cache is stored in several data structures for Cisco Express Forwarding switching. The data structures provide optimized lookup for efficient packet forwarding. The two main components of Cisco Express Forwarding operation are the forwarding information base (FIB) and the adjacency tables. The FIB is conceptually similar to a routing table or information base. A router uses this lookup table to make destination-based switching decisions during Cisco Express Forwarding operation. The FIB is updated when changes occur in the network and contains all routes known at the time. Adjacency tables maintain Layer 2 next-hop addresses for all FIB entries. This separation of the reachability information (in the Cisco Express Forwarding table) and the forwarding information (in the adjacency table), provides a number of benefits: 

. The adjacency table can be built separately from the Cisco Express Forwarding table, allowing both to be built without any packets being process-switched. 

. The MAC header rewrite used to forward a packet is not stored in cache entries, so changes in a MAC header rewrite string do not require validation of cache entries. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipswitch_cef/configuration/15-mt/isw-cef-15-mt-book/isw-cef-overview.html 


Q297. Which two statements about 6VPE are true? (Choose two.) 

A. It allows a service provider to use an existing MPLS network to provide VPN services to IPv6 customers. 

B. It uses MP-BGP as the carrier protocol to transport IPv6 connectivity. 

C. It provides IPv6 connectivity to MPLS-VPN customers when IPv6 overlay tunneling is also configured. 

D. It allows a service provider to use an existing MPLS network to provide global addressing to their IPv6 customers. 

E. It requires the configuration of a GRE tunnel tagged with a VLAN ID. 

F. It allows a service provider to use an existing L2TPv3 network to provide VPN services to IPv6 customers. 

Answer: A,B 

Explanation: 

The IPv6 MPLS VPN service model is similar to that of IPv4 MPLS VPNs. Service providers who have already deployed MPLS IPv4 VPN services over an IPv4 backbone can deploy IPv6 MPLS VPN services over the same IPv4 backbone by upgrading the PE router IOS version and dual-stack configuration, without any change on the core routers. IPv4 services can be provided in parallel with IPv6 services. IPv6 VPN service is exactly the same as MPLS VPN for IPv4. 6VPE offers the same architectural features as MPLS VPN for IPv4. It offers IPv6 VPN and uses the same components, such as: . 

Multiprotocol BGP (MP-BGP) VPN address family . 

Route distinguishers . 

VPN Routing and Forwarding (VRF) instances . 

Site of Origin (SOO) . 

Extended community . 

MP-BGP 

Reference: http://www.cisco.com/c/en/us/td/docs/net_mgmt/ip_solution_center/5-2/mpls_vpn/user/guide/mpls52book/ipv6.html 


Q298. Which three options are three of the default EIGRP administrative distances? (Choose three.) 

A. Internal, 90 

B. External, 170 

C. Summary, 5 

D. Outside Local, 100 

E. Inside Local, 180 

F. Inside Global, 1 

Answer: A,B,C 

Explanation: 

The following table lists the default administrative distances for various routing protocols used on Cisco routers. 

Routing Protocol 

Administrative distance 

Directly connected interface 

Static route out an interface 

Static route to next-hop address 

DMNR - Dynamic Mobile Network Routing 

EIGRP summary route 

External BGP 

20 

Internal EIGRP 

90 

IGRP 

100 

OSPF 

110 

IS-IS 

115 

Routing Information Protocol (RIP) 

120 

Exterior Gateway Protocol (EGP) 

140 

On Demand Routing (ODR) 

160 

External EIGRP 

170 

Internal BGP 

200 

Floating Static Route (ex. DHCP-learned) 

254 

Unknown 

255 

Reference: http://en.wikipedia.org/wiki/Administrative_distance 


Q299. Which two statements about BPDU guard are true? (Choose two.) 

A. The global configuration command spanning-tree portfast bpduguard default shuts down interfaces that are in the PortFast-operational state when a BPDU is received on that port. 

B. The interface configuration command spanning-tree portfast bpduguard enable shuts down only interfaces with PortFast enabled when a BPDU is received. 

C. BPDU guard can be used to prevent an access port from participating in the spanning tree in the service provider environment. 

D. BPDU guard can be used to protect the root port. 

E. BPDU guard can be used to prevent an invalid BPDU from propagating throughout the network. 

Answer: A,C 


Q300. Which neighbor-discovery message type is used to verify connectivity to a neighbor when the link-layer address of the neighbor is known? 

A. neighbor solicitation 

B. neighbor advertisement 

C. router advertisement 

D. router solicitation 

Answer:

Explanation: 

IPv6 Neighbor Solicitation Message A value of 135 in the Type field of the ICMP packet header identifies a neighbor solicitation message. Neighbor solicitation messages are sent on the local link when a node wants to determine the link-layer address of another node on the same local link (see the figure below). When a node wants to determine the link-layer address of another node, the source address in a neighbor solicitation message is the IPv6 address of the node sending the neighbor solicitation message. The destination address in the neighbor solicitation message is the solicited-node multicast address that corresponds to the IPv6 address of the destination node. The neighbor solicitation message also includes the link-layer address of the source node. 

Figure 1. IPv6 Neighbor Discovery: Neighbor Solicitation Message 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/xe-3s/ip6b-xe-3s-book/ip6-neighb-disc-xe.html