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Q81. Which three fields are part of a TCN BPDU? (Choose three.) 

A. protocol ID 

B. version 

C. type 

D. max-age 

E. flags 

F. message age 

Answer: A,B,C 


Q82. When you configure the ip pmtu command under an L2TPv3 pseudowire class, which two things can happen when a packet exceeds the L2TP path MTU? (Choose two.) 

A. The router drops the packet. 

B. The router always fragments the packet after L2TP/IP encapsulation. 

C. The router drops the packet and sends an ICMP unreachable message back to the sender only if the DF bit is set to 1. 

D. The router always fragments the packet before L2TP/IP encapsulation. 

E. The router fragments the packet after L2TP/IP encapsulation only if the DF bit is set to 0. 

F. The router fragments the packet before L2TP/IP encapsulation only if the DF bit is set to 

0. 

Answer: C,F 

Explanation: 

If you enable the ip pmtu command in the pseudowire class, the L2TPv3 control channel participates in the path MTU discovery. When you enable this feature, the following processing is performed: 

– ICMP unreachable messages sent back to the L2TPv3 router are deciphered and the tunnel MTU is updated accordingly. In order to receive ICMP unreachable messages for fragmentation errors, the DF bit in the tunnel header is set according to the DF bit value received from the CE, or statically if the ip dfbit set option is enabled. The tunnel MTU is periodically reset to the default value based on a periodic timer. 

– ICMP unreachable messages are sent back to the clients on the CE side. ICMP unreachable messages are sent to the CE whenever IP packets arrive on the CE-PE interface and have a packet size greater than the tunnel MTU. A Layer 2 header calculationis performed before the ICMP unreachable message is sent to the CE. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/l2tpv325.html 


Q83. DRAG DROP 

Drag and drop the argument of the mpls ip cef load-sharing command on the left to the function it performs on the right. 

Answer: 


Q84. Which two options are causes of out-of-order packets? (Choose two.) 

A. a routing loop 

B. a router in the packet flow path that is intermittently dropping packets 

C. high latency 

D. packets in a flow traversing multiple paths through the network 

E. some packets in a flow being process-switched and others being interrupt-switched on a transit router 

Answer: D,E 

Explanation: 

In traditional packet forwarding systems, using different paths have varying latencies that cause out of order packets, eventually resulting in far lower performance for the network application. Also, if some packets are process switched quickly by the routing engine of the router while others are interrupt switched (which takes more time) then it could result in out of order packets. The other options would cause packet drops or latency, but not out of order packets. 


Q85. Which two parameters does the Tunnel Mode Auto Selection feature select automatically? (Choose two.) 

A. the tunneling protocol 

B. the transport protocol 

C. the ISAKMP profile 

D. the transform-set 

E. the tunnel peer 

Answer: A,B 

Explanation: 

The Tunnel Mode Auto Selection feature eases the configuration and spares you about knowing the responder’s details. This feature automatically applies the tunneling protocol (GRE or IPsec) and transport protocol (IPv4 or IPv6) on the virtual template as soon as the IKE profile creates the virtual access interface. This feature is useful on dual stack hubs aggregating multivendor remote access, such as Cisco AnyConnect VPN Client, Microsoft Windows7 Client, and so on. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_conn_vpnips/configuration/xe-3s/sec-sec-for-vpns-w-ipsec-xe-3s-book/sec-ipsec-virt-tunnl.html 


Q86. If two OSPF type 3 prefixes have the same metric, and are within the same process, which prefix(es) are installed into the routing table? 

A. The route whose originator has the lower router ID. 

B. Both routes are installed. 

C. The route whose originator has the higher router ID. 

D. The first route that is learned. 

Answer:

Explanation: 

OSPF allows multiple equal-cost paths to the same destination. Since all link-state information is flooded and used in the SPF calculation, multiple equal cost paths can be computed and used for routing, and each route will be installed in the routing table. 


Q87. What is the most common use for route tagging in EIGRP? 

A. to determine the route source for management purposes 

B. to change the metric of a prefix 

C. to filter routes in order to prevent routing loops 

D. to modify path selection for certain classes of traffic 

Answer:


Q88. Refer to the exhibit. 

What is wrong with the configuration of the tunnel interface of this DMVPN Phase II spoke router? 

A. The interface MTU is too high. 

B. The tunnel destination is missing. 

C. The NHRP NHS IP address is wrong. 

D. The tunnel mode is wrong. 

Answer:

Explanation: 

By default, tunnel interfaces use GRE as the tunnel mode, but a DMVPN router needs to be configured for GRE multipoint by using the “tunnel mode gre multipoint” interface command. 


Q89. DRAG DROP 

Drag and drop the argument of the ip cef load-sharing algorithm command on the left to the function it performs on the right. 

Answer: 


Q90. Which two statements about UDP and latency are true? (Choose two.) 

A. UDP is connection oriented, so the size of a UDP stream is independent of latency. 

B. UDP is connection oriented, so latency can increase the size of a UDP stream. 

C. UDP is connectionless, so latency can increase the size of a UDP stream. 

D. If latency decreases, throughput also decreases. 

E. If latency increases, throughput also increases. 

F. Latency can cause jitter on UDP connections. 

Answer: C,F