* The maximum transmission unit (MTU) is the largest size of a data packet that can be transmitted over a network link12. The MTU is usually configured on the network devices, such as routers and switches, to match the physical or logical characteristics of the link34.
* If the connected device sends a packet that is larger than the MTU of the switchport, the packet will be either fragmented or dropped, depending on the protocol and configuration12. This can cause performance issues, such as increased latency, reduced throughput, and packet loss56.
* Based on the information in the chart, the switchport has a high number of giants, which are packets that exceed the MTU of the link78. This indicates that the connected device is exceeding the configured MTU of the switchport, and thus causing the performance issues.
* The other options are not supported by the information in the chart. The number of packets sent or received by the connected device does not necessarily affect the performance of the switchport, unless there is congestion or buffer overflow. The uptime of the switchport does not affect its performance, unless there is a hardware or software failure. The number of CRCs (cyclic redundancy checks) indicates the error rate of the link, and the switchport has zero CRCs, which means there are no errors detected910.
* Therefore, the best answer is A. The connected device is exceeding the configured MTU.
References:
* 1: CompTIA Network+ N10-008 Certification Study Guide, page 67
* 2: CompTIA Network+ Certification Exam Objectives, page 7
* 3: [What is Maximum Transmission Unit (MTU)? - Definition from WhatIs.com]
* 4: [MTU Size Issues | Network World]
* 5: [How MTU Size Affects Network Performance | SolarWinds MSP]