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Q241. Refer to the exhibit. 

Which OSPFv3 routes will be visible in the routing table of R2? 

A. 2001:12::1/128 

B. 2001:12::1/128, 2001:112::1/128 

C. 2001:12::2/128 

D. No OSPFv3 routes will be visible. 

Answer: D 

Explanation: 

The command “ipv6 unicast-routing” needs to be configured on both routers before any IPv6 routes will be seen. 


Q242. Which EEM event detector is triggered by hardware installation or removal? 

A. Enhanced-Object-Tracking Event Detector 

B. Resource Event Detector 

C. OIR Event Detector 

D. CLI Event Detector 

Answer: C 


Q243. Which two values are needed to configure NTP authentication? (Choose two.) 

A. the encryption method 

B. the key number 

C. the burst mode 

D. the key string 

E. the Diffie-Hellman group 

Answer: B,D 


Q244. Which two best practices does Cisco recommend to migrate a network from PVST+ to MST? (Choose two.) 

A. Start the migration at the edge nodes and work toward the root bridge. 

B. Before starting the transition, configure one of the edge nodes with a lower priority so that it becomes the root bridge after the transition. 

C. Before starting the transition, ensure that at least two nodes act as the root bridge for all VLANs in the network. 

D. Start the migration at the root bridge and work toward the edge nodes. 

E. Before starting the transition, configure one of the edge nodes with a higher priority so that it becomes the root bridge after the transition. 

F. Before starting the transition, ensure that one node is the root bridge for all VLANs in the network. 

Answer: A,F 


Q245. Refer to the exhibit. The Main1 and Branch1 switches are connected directly over an MPLS pseudowire, and both run UDLD. After router B1 reloads because of a power failure, the pseudowire is restored. However, the Branch1 switch is unable to reach the Main1 switch. 

Which two actions can you take to restore connectivity and prevent the problem from recurring? (Choose two.) 

A. Configure a backup pseudowire between the Main1 and Branch1 switches. 

B. Enable UDLD recovery on both the Main1 and Branch1 switches. 

C. Configure a backup GRE tunnel between the Main1 and Branch1 switches. 

D. Enable errdisable recovery on both the Main1 and Branch1 switches. 

E. Issue the shutdown and no shutdown commands on both the Branch1 switch’s uplink to the B1 router and the Main1 switch’s uplink to the M1 router. 

F. Issue the shutdown and no shutdown commands on the Branch1 switch uplink to the B1 router only. 

Answer: D,F 


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Q246. Refer to the exhibit. 

When the link between RtrB and RtrC goes down, multicast receivers stop receiving traffic from the source for multicast group 229.1.1.1.Which solution will resolve this? 

A. adding a static mroute on RtrB and RtrF 

B. adding a static unicast route on RtrB and RtrF 

C. creating a GRE tunnel between RtrB and RtrD 

D. enabling PIM sparse mode on both ends of the link between RtrB and RtrF 

Answer: D 

Explanation: 

For multicast traffic to flow, PIM must be enabled on all routers in the path of the multicast stream. 


Q247. Which three features require Cisco Express Forwarding? (Choose three.) 

A. NBAR 

B. AutoQoS 

C. fragmentation 

D. MPLS 

E. UplinkFast 

F. BackboneFast 

Answer: A,B,D 

Explanation: 

QoS Features That Require CEF 

These class-based QoS features are supported only on routers that run CEF. 

.Network Based Application Recognition (NBAR) provides intelligent network classification. For more information, refer to Network Based Application Recognition. 

. The AutoQoS -VoIP feature simplifies and speeds up the implementation and provisioning of QoS for VoIP traffic. This feature is enabled with the help of the auto qos voip command. CEF must be enabled at the interface or ATM PVC before the auto qos command can be used. For more information about this feature and its prerequisites, refer to AutoQoS -VoIP. 

From MPLS Fundamentals - Luc De Ghein 

Why Is CEF Needed in MPLS Networks? 

Concerning MPLS, CEF is special for a certain reason; otherwise, this book would not explicitly cover it. Labeled packets that enter the router are switched according to the label forwarding information base (LFIB) on the router. IP packets that enter the router are switched according to the CEF table on the router. Regardless of whether the packet is switched according to the LFIB or the CEF table, the outgoing packet can be a labeled packet or an IP packet 

Reference: http://www.cisco.com/c/en/us/support/docs/asynchronous-transfer-mode-atm/ip-to-atm-class-of-service/4800-cefreq.html 


Q248. You are configuring a DHCPv6 client for a DHCPv6 server with the prefix delegation feature. Which option is a result of the interface configuration when you enter the command ipv6 address autoconfig default? 

A. a static IPv6 default route pointing to the upstream DHCP server 

B. a static IPv6 default route pointing to the upstream DHCP relay 

C. a static IPv6 default route pointing to the upstream router 

D. a temporary stateless address, formed from the EUI-64 bit address and the prefix from the route advertisement of the upstream router 

Answer: A 


Q249. Which two features are supported when Cisco HDLC is implemented? (Choose two.) 

A. error recovery 

B. error detection 

C. asynchronous links 

D. multiple protocols 

Answer: B,D 

Explanation: 

HDLC’s frame check sequence (FCS) is a 16-bit CRC-CCITT or a 32-bit CRC-32 computed over the Address, Control, and Information fields. It provides a means by which the receiver can detect errors that may have been induced during the transmission of the frame, such as lost bits, flipped bits, and extraneous bits. Cisco’s HDLC contains a proprietary field that is used to support multiple protocols. 

Reference: http://en.wikipedia.org/wiki/High-Level_Data_Link_Control 


Q250. While troubleshooting an issue for a remote user, you must capture the communication between the user's computer and a server at your location. The traffic passes through a Cisco IOS-XE capable switch. Which statement about obtaining the capture is true? 

A. The Embedded Packet Capture application in the IOS-XE Software can capture the packets, but there is a performance impact. 

B. The Embedded Packet Capture application in the IOS-XE Software can capture the packets without impacting performance. 

C. The Mini Protocol Analyzer embedded in the IOS-XE Software can capture the packets without impacting performance. 

D. The Mini Protocol Analyzer embedded in the IOS-XE Software can be used to capture the packets, but there is a performance impact. 

E. Wireshark can capture packets through a SPAN port, but there is a performance impact. 

Answer: A