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NEW QUESTION: 1
Which switch port error is an indication of duplex mismatches on 10/100/1000 IEEE 802.3u Gigabit Ethernet ports?
A. Runts
B. FCS errors
C. Multiple collisions
D. Alignment errors
Answer: C
Explanation:
Communication is possible over a connection in spite of a duplex mismatch. Single packets are sent and acknowledged without problems. As a result, a simple ping command fails to detect a duplex mismatch because single packets and their resulting acknowledgments at 1-second intervals do not cause any problem on the network. A terminal session which sends data slowly (in very short bursts) can also communicate successfully. However, as soon as either end of the connection attempts to send any significant amount of data, the network suddenly slows to very low speed. Since the network is otherwise working, the cause is not so readily apparent. A duplex mismatch causes problems when both ends of the connection attempt to transfer data at the same time. This happens even if the channel is used (from a high-level or user's perspective) in one direction only, in case of large data transfers. Indeed, when a large data transfer is sent over a TCP, data is sent in multiple packets, some of which will trigger an acknowledgment packet back to the sender. This results in packets being sent in both directions at the same time. In such conditions, the full-duplex end of the connection sends its packets while receiving other packets; this is exactly the point of a full-duplex connection. Meanwhile, the half-duplex end cannot accept the incoming data while it is sending -- it will sense it as a collision. The half-duplex device ceases its current transmission and then retries later as per CSMA/CD. As a result, when both devices are attempting to transmit at the same time, packets sent by the full-duplex end will be lost and packets sent by the half duplex device will be delayed or lost.
The lost packets force the TCP protocol to perform error recovery, but the initial (streamlined) recovery attempts fail because the retransmitted packets are lost in exactly the same way as the original packets. Eventually, the TCP transmission window becomes full and the TCP protocol refuses to transmit any further data until the previously-transmitted data is acknowledged. This, in turn, will quiescence the new traffic over the connection, leaving only the retransmissions and acknowledgments. Since the retransmission timer grows progressively longer between attempts, eventually a retransmission will occur when there is no reverse traffic on the connection, and the acknowledgments are finally received. This will restart the TCP traffic, which in turn immediately causes lost packets as streaming resumes. The end result is a connection that is working but performs extremely poorly because of the duplex mismatch. Symptoms of a duplex mismatch are connections that seem to work fine with a ping command, but "lock up" easily with very low throughput on data transfers; the effective data transfer rate is likely to be asymmetrical, performing much worse in one direction than the other. In normal half-duplex operations late collisions do not occur. However, in a duplex mismatch the collisions seen on the half-duplex side of the link are often late collisions. The full-duplex side usually will register frame check sequence errors, or runt frames. Viewing these standard Ethernet statistics can help diagnose the problem. Contrary to what one might reasonably expect, both sides of a connection need to be identically configured for proper operation. In other words, setting one side to automatic (either speed or duplex or both) and setting the other to be fixed (either speed or duplex or both) will result in a speed mismatch, a duplex mismatch or both. A duplex mismatch can be fixed by either enabling autonegotiation (if available and working) on both ends or by forcing the same settings on both ends (availability of a configuration interface permitting). If there is no option but to have a locked setting on one end and autonegotiation the other (for example, an old device with broken autonegotiation connected to an unmanaged switch) half duplex must be used. All modern LAN equipment comes with autonegotiation enabled and the various compatibility issues have been resolved. The best way to avoid duplex mismatches is to use autonegotiation and to replace any legacy equipment that does not use autonegotiation or does not autonegotiate correctly.
NEW QUESTION: 2
Host A is transmitting data to host B on a TCP connection. What is the purpose of the ACK sent by host B?
A. The ACK is flow control from host B and tells host A to reduce its transmission rate.
B. The ACK tells host A the sequence number of the segment that was just received by host
C. The ACK tells the host A that host B wishes to establish a session.
D. The ACK tells host A the sequence number of the next segment that host B expects to see.
Answer: D
NEW QUESTION: 3
A. Option A
B. Option C
C. Option D
D. Option B
Answer: B
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