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Q351. Which two statements are true about a 6to4 tunnel connecting two IPv6 islands over the IPv4 Internet? (Choose two.) 

A. It embeds the IPv6 packet into the IPv4 payload with the protocol type set to 51. 

B. It works by appending the private IPv4 address (converted into hexadecimal format) to the 2002::/16 prefix. 

C. It embeds the IPv6 packet into the IPv4 payload with the protocol type set to 41. 

D. It works by appending the public IPv4 address (converted into hexadecimal format) to the 2002::/16 prefix. 

Answer: C,D 

Explanation: 

6to4 embeds an IPv6 packet in the payload portion of an IPv4 packet with protocol type 41. To send an IPv6 packet over an IPv4 network to a 6to4 destination address, an IPv4 

header with protocol type 41 is prepended to the IPv6 packet. The IPv4 destination address for the prepended packet header is derived from the IPv6 destination address of the inner packet (which is in the format of a 6to4 address), by extracting the 32 bits immediately following the IPv6 destination address's 2002::/16 prefix. The IPv4 source address in the prepended packet header is the IPv4 address of the host or router which is sending the packet over IPv4. The resulting IPv4 packet is then routed to its IPv4 destination address just like any other IPv4 packet. 

Reference: http://en.wikipedia.org/wiki/6to4 


Q352. DRAG DROP 

Drag each GETVPN component on the left to its function on the right. 

Answer: 


Q353. You are installing a new device to replace a device that failed. The configuration of the failed device is stored on a networked server, and the new device has an RXBOOT image installed. Under which condition does the streamlined Setup mode fail? 

A. The last four bits of the configuration register are not equal to the decimal value 0 or 1. 

B. The startup configuration file was deleted. 

C. Bit 6 is set in the configuration register. 

D. The startup configuration is corrupt. 

Answer:

Explanation: 

The lowest four bits of the configuration register (bits 3, 2, 1, and 0) form the boot field. The boot field determines if the router boots manually, from ROM, or from Flash or the network. To change the boot field value and leave all other bits set to their default values, follow these guidelines: 

. If you set the configuration register boot field value to 0x0, you must boot the operating system manually with the boot command. 

. If you set the configuration register boot field value to 0x1, the router boots using the default ROM software. 

. If you set the configuration register boot field to any value from 0x2 to 0xF, the router uses the boot field value to form a default boot filename for booting from a network server. For more information about the configuration register bit settings and default filenames, refer to the appropriate router hardware installation guide. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/configfun/command/reference/ffun_r/frf010. html 


Q354. Which option is true about output policing for the control plane? 

A. It improves router performance by limiting traffic sent to the control plane. 

B. It improves router performance by limiting traffic sent from the control plane. 

C. It improves router performance by limiting traffic sent to and from the control plane. 

D. It controls traffic originated from the router. 

Answer:


Q355. Refer to the exhibit. 

A spoke site that is connected to Router-A cannot reach a spoke site that is connected to Router-B, but both spoke sites can reach the hub. What is the likely cause of this issue? 

A. There is a router doing PAT at site B. 

B. There is a router doing PAT at site A. 

C. NHRP is learning the IP address of the remote spoke site as a /32 address rather than a /24 address. 

D. There is a routing issue, as NHRP registration is working. 

Answer:

Explanation: 

If one spoke is behind one NAT device and another different spoke is behind another NAT device, and Peer Address Translation (PAT) is the type of NAT used on both NAT devices, then a session initiated between the two spokes cannot be established. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/ios_xe/sec_secure_connectivity/configuration/gui de/convert/sec_dmvpn_xe_3s_book/sec_dmvpn_dt_spokes_b_nat_xe.html 


Q356. When the BGP additional-paths feature is used, what allows a BGP speaker to differentiate between the different available paths? 

A. The remote BGP peer prepends its own next-hop address to the prefix. 

B. A unique path identifier is encoded into a dedicated field to the NLRI. 

C. A route distinguisher is appended to the prefix by the receiving BGP speaker. 

D. The additional path information is encoded in an extended community. 

Answer:


Q357. Which timer expiration can lead to an EIGRP route becoming stuck in active? 

A. hello 

B. active 

C. query 

D. hold 

Answer:

Explanation: 

As noted above, when a route goes into the active state, the router queries its neighbors to find a path to the pertinent network. At this point, the router starts a three minute active timer by which time it must receive replies from all queried neighbors. If a neighbor has feasible successors for the route, it will recalculate its own local distance to the network and report this back. However, if a neighbor does not have a feasible successor, it also goes into active state. In some cases, multiple routers along multiple query paths will go into active state as routers continue to query for the desired route. In most cases, this process will yield responses from all queried routers and the sought after route will transition back into the passive state within the three minute SIA query timer. In the case that none of the queried routers can provide a feasible successor, the route is cleared. In some cases, a response is not received between two neighbor routers because of link failures, congestion or some other adverse condition in either the network or on the queried router, and the three minute active timer expires on the router originating the query. When this happens, the querying router that did not receive a response logs a “DUAL-3-SIA” or “stuck-in-active” error for the route and then drops and restarts its adjacency with the non-responding router 

Reference: http://www.packetdesign.com/resources/technical-briefs/diagnosing-eigrp-stuck-active 


Q358. Refer to the exhibit. 

Which type of BGP peer is 192.168.1.1? 

A. route reflector client 

B. iBGP 

C. confederation 

D. VPNv4 

Answer:


Q359. Refer to the exhibit. 

Which two statements are true about the displayed STP state? (Choose two.) 

A. The STP version configured on the switch is IEEE 802.1w. 

B. Port-channel 1 is flapping and the last flap occurred 1 minute and 17 seconds ago. 

C. The switch does not have PortFast configured on Gi0/15. 

D. BPDUs with the TCN bit set are transmitted over port channel 1. 

Answer: C,D 

Explanation: 

A port enabled with portfast will not send topology changes when a port goes up or down, but here we see that 296 TCN’s were sent so we know that Gi 0/15 does not have portfast enabled. 

TCN’s are sent using BPDU’s over the root port, which we see is port channel 1. 


Q360. Which protocol is the encapsulating protocol for mtrace packets? 

A. ICMP 

B. IGMP 

C. PIM 

D. GRE 

Answer:

Explanation: 

“mtrace” is a diagnostic tool to trace the multicast path from a specified source to a destination for a multicast group. It runs over IGMP protocol. Mtrace uses any information available to it to determine a previous hop to forward the trace towards the source. 

Reference: http://www.brocade.com/downloads/documents/html_product_manuals/NI_05500c_MULTI CAST/wwhelp/wwhimpl/common/html/wwhelp.htm#context=NI_MCAST&file=IP_Multicast. 3.04.html