Question 6 of 290 from exam 400-151: CCIE Data Center Written Exam

Question 6 of 290 from exam 400-151: CCIE Data Center Written Exam


Which two options are functions of the 6LoWPAN header? (Choose two.)



A. B. C. D. E.


The 6LoWPAN (IPv6 over Low Power Wireless Personal Area Networks) is a protocol designed to enable communication between devices with limited processing power and memory, such as wireless sensor networks. The 6LoWPAN protocol uses header compression and fragmentation techniques to reduce the overhead associated with IPv6 headers, which are typically much larger than the payload data in such networks.

The functions of the 6LoWPAN header are as follows:

  1. IPv6 header compression: The 6LoWPAN header compresses the IPv6 header to reduce its size, as the typical IPv6 header size of 40 bytes is too large for devices with limited resources. The header compression is achieved by eliminating redundant fields and using stateless compression techniques.

  2. Packet fragmentation and reassembly: The 6LoWPAN header also enables fragmentation and reassembly of IPv6 packets to accommodate the limited packet size of low-power wireless networks. IPv6 packets may be fragmented into smaller packets, which can be transmitted over the network, and then reassembled at the receiving end.

Therefore, options A and C are the correct answers as they describe the two functions of the 6LoWPAN header. Option B is not correct as the TTL (Time to Live) field is part of the IPv6 header and not the 6LoWPAN header. Option D is not correct as the CRC (Cyclic Redundancy Check) is typically performed at the link layer to ensure the integrity of the transmitted packets. Option E is also not correct as the 6LoWPAN header does not provide Layer 2 encryption.