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| 200 | + <p>Question: According to the 10BASE-T Ethernet technical specification, what is the maximum distance between a HUB and a network interface card (NIC)?</p> |
| 201 | + |
| 202 | +<p>A. 20m<br /> |
| 203 | +B. 50m<br /> |
| 204 | +C. 100m<br /> |
| 205 | +D. 200m</p> |
| 206 | + |
| 207 | +<p>Answer:</p> |
| 208 | + |
| 209 | +<p><strong>C. 100m</strong></p> |
| 210 | + |
| 211 | +<p><strong>Explanation:</strong></p> |
| 212 | + |
| 213 | +<p>The 10BASE-T standard (defined in IEEE 802.3i-1990) is the 10 Mbps Ethernet specification that uses unshielded twisted-pair (UTP) cabling — typically Category 3 or better — and operates in a physical star topology with a hub (or repeater) at the center.</p> |
| 214 | + |
| 215 | +<p>Key technical parameters of 10BASE-T include:</p> |
| 216 | + |
| 217 | +<ul> |
| 218 | + <li>Maximum cable length between the hub (repeater) and the network interface card (DTE): <strong>100 meters</strong></li> |
| 219 | + <li>Uses RJ-45 connectors</li> |
| 220 | + <li>Two pairs of the four pairs in the cable are used (one for transmit, one for receive)</li> |
| 221 | + <li>The 100-meter limit includes patch cords and is the total allowed length of the horizontal cabling segment</li> |
| 222 | +</ul> |
| 223 | + |
| 224 | +<p>This 100-meter maximum segment length is a fundamental rule in 10BASE-T and has been consistently documented in both the original IEEE 802.3 standard and all subsequent references.</p> |
| 225 | + |
| 226 | +<p>Therefore, the correct answer is <strong>C. 100m</strong>.</p> |
| 227 | + |
| 228 | +<p>The other options are incorrect because:</p> |
| 229 | +<ul> |
| 230 | + <li>20m and 50m are far below the standard allowance</li> |
| 231 | + <li>200m exceeds the specification and would cause excessive signal attenuation and timing problems</li> |
| 232 | +</ul> |
| 233 | + |
| 234 | +<p>References:</p> |
| 235 | + |
| 236 | +<ul> |
| 237 | + <li>IEEE 802.3-1990 standard (10BASE-T clause)</li> |
| 238 | + <li><a href="https://standards.ieee.org/ieee/802.3/1990/">https://standards.ieee.org/ieee/802.3/1990/</a></li> |
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