Automatically converts the 32 bits in its ipv6

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automatically converts the 32 bits in its IPv6 address following this prefix to a global unicast IPv4address for transport across an IPv4 network such as the public Internet. ReferencE. QUESTION NO: 376 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.) Cisco 400-101 Exam "Pass Any Exam. Any Time." - 306
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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,FExplanation: If you enable the ip pmtucommand in the pseudowire class, the L2TPv3 control channelparticipates in the path MTU discovery. When you enable this feature, the following processing isperformed: 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 calculation is performed before the ICMP unreachable message is sent to the CE. ReferencE. QUESTION NO: 377 Which two parameters does the Tunnel Mode Auto Selection feature select automatically?(Choose two.) Cisco 400-101 Exam "Pass Any Exam. Any Time." - 307
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