多选题What are two rules for compacting IPv6 addresses？（）AThe maximum number of times a double colon can replace a 16-bit segment that consists of all zeroes is twoBThe leading zeroes in any 16-bit segment do not have to be written.CEvery 16-bit segment that

A. Every 16 - bit segment segment that consists of all zeroes can be represented with a single colon.

B. The trailing zeroes in any 16 - bit segment do not have to be written.

C. The leading zeroes in any 16 - bit segment do not have to be written.

D. Any single, continuous string of one or more 16 - bit segments that consists of all zeroes can be represented with a double colon.

E. The maximum number of times a double colon can replace a 16 - bit segment that consists of all zeroes is two.

F. Two zeroes in the middle of any 16 -bit segment do not have to be written.

When the system upon which a transport entity is running fails and subsequently restarts, the(66)information of all active connections is lost. The affected connections become half-open, as the side that did not fail does not yet realize the problem.The still active side of a half-open connection can close the connection using a(67)timer. This timer measures the time the transport machine will continue to await an(68)of a transmitted segment after the segment has been retransmitted the maximum number of times. When the timer(69), the transport entity assumes that either the other transport entity or the intervening network has failed. As a result, the timer closes the connection, and signals an abnormal close to the TS user.In the event that a transport entity fails and quickly restarts, half-open connections can be terminated more quickly by the use of the RST segment. The failed side returns an RST i to every segment i that it receives. When the RST i reaches the other side, it must be checked for validity based on the(70)number i, as the RST could be in response to an old segment. If the reset is valid, the transport entity performs an abnormal termination.

A．data

B．state

C．signal

D．control

A. An IPv6 address consists of 128 bits separated into eight 16-bit hexadecimal sections.

B. An IPv6 address consists of 64 bits separated into four 16-bit hexadecimal sections.

C. An IPv6 address consists of 128 bits separated into sixteen 8-bit hexadecimal sections.

D. An IPv6 address consists of 64 bits separated into eight 8-bit hexadecimal sections.

A. The number of broadcast domains will be decreased.

B. It will make the broadcasting of traffic between domains more efficient between segments.

C. It will increase the number of collisions.

D. It will prevent segment 1‘s broadcasts from getting to segment 2.

E. It will connect segment 1‘s broadcasts to segment 2.

A. The source device will only retransmit lost packets on the request of the destination device.

B. The source device starts a timer when it sends a segment and retransmits if an acknowledgment is not received before the timer expires.

C. The destination device acknowledges receipt of a segment by sending a packet with a new sequence number and the ACK bit sent.

D. The destination device acknowledges receipt of a segment by sending a packet that indicates the next sequence number it expects.

E. If the destination device does not receive a segment, all segments are retransmitted.

F. The source device keeps a record of all segments sent and expects and acknowledgment of each.