access-list 101 permit ip和 access-list 101 permit tcp和access-list 101 permit udp三者之间有什么区别?

[asdd3000]

access-list 101 permit ip和 access-list 101 permit tcp和access-list 101 permit udp三者之间有什么区别?
为什么有的用tcp协议,有的用ip协议,而有的用udp呢?什么时候用TCP?什么时候用IP?什么时候用UDP?

[we_us]

首先你要弄清楚IP，TCP，UDP的区别，举个简单的例子,一些应用程序使用的是TCP，一些使用的是UDP协议，一些两个都会用到如：DNS。TCP/UDP都是基于IP协议的，把关系搞清楚了就能理解了。也有不使用IP协议的，如使用IPX/SPX，现在用昨不多了。
这些搞清楚了，你就知道不同的access-list管些什么了。
C:\>netstat -na

Active Connections

Proto Local Address Foreign Address State
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING
TCP 0.0.0.0:2000 0.0.0.0:0 LISTENING
TCP 0.0.0.0:2001 0.0.0.0:0 LISTENING
TCP 0.0.0.0:7200 0.0.0.0:0 LISTENING
TCP 127.0.0.1:1027 0.0.0.0:0 LISTENING
TCP 127.0.0.1:2000 127.0.0.1:2071 ESTABLISHED
TCP 127.0.0.1:2064 127.0.0.1:7200 ESTABLISHED
TCP 127.0.0.1:2071 127.0.0.1:2000 ESTABLISHED
TCP 127.0.0.1:7200 127.0.0.1:2064 ESTABLISHED
TCP 172.27.5.1:139 0.0.0.0:0 LISTENING
TCP 172.27.5.1:2001 172.27.5.3:23033 ESTABLISHED
TCP 192.168.1.13:139 0.0.0.0:0 LISTENING
TCP 192.168.1.13:1434 60.28.10.53:80 CLOSE_WAIT
TCP 192.168.1.13:1994 207.46.106.71:1863 ESTABLISHED
TCP 192.168.1.13:2006 207.46.26.121:1863 ESTABLISHED
TCP 192.168.1.13:2007 207.46.27.14:1863 ESTABLISHED
TCP 192.168.1.13:2008 207.46.26.177:1863 ESTABLISHED
TCP 192.168.1.13:2052 207.46.26.176:1863 ESTABLISHED
TCP 192.168.1.13:2076 207.46.26.24:1863 ESTABLISHED
TCP 192.168.1.13:2320 211.100.26.98:80 ESTABLISHED
TCP 192.168.1.13:2358 211.100.26.125:80 TIME_WAIT
TCP 192.168.1.13:2365 211.100.26.75:80 ESTABLISHED
TCP 192.168.1.13:2366 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2367 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2368 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2369 211.100.26.124:80 TIME_WAIT
TCP 192.168.1.13:2370 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2374 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2375 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2376 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2379 211.100.26.123:80 TIME_WAIT
TCP 192.168.1.13:2380 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2382 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2383 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2384 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2385 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2386 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2387 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2388 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2389 60.28.252.222:80 TIME_WAIT
TCP 192.168.1.13:2390 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2391 211.100.26.124:80 TIME_WAIT
TCP 192.168.1.13:2393 203.81.26.100:80 TIME_WAIT
TCP 192.168.1.13:2394 211.100.26.124:80 TIME_WAIT
TCP 192.168.1.13:2396 203.81.26.100:80 TIME_WAIT
TCP 192.168.1.13:2398 203.81.26.104:80 TIME_WAIT
TCP 192.168.1.13:2399 60.18.146.51:80 TIME_WAIT
TCP 192.168.1.13:2400 203.81.26.100:80 TIME_WAIT
TCP 192.168.1.13:2401 203.81.26.100:80 TIME_WAIT
TCP 192.168.1.13:2402 211.100.26.81:80 ESTABLISHED
TCP 192.168.1.13:2409 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2410 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2411 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2413 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2417 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2422 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2425 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2427 211.100.26.121:80 TIME_WAIT
TCP 192.168.1.13:2430 211.100.26.122:80 TIME_WAIT
TCP 192.168.1.13:2433 211.100.26.122:80 TIME_WAIT
TCP 192.168.1.13:2437 211.100.26.122:80 TIME_WAIT
TCP 192.168.1.13:2439 211.100.26.122:80 TIME_WAIT
TCP 192.168.1.13:2447 211.100.26.122:80 TIME_WAIT
TCP 192.168.1.13:2449 211.100.26.88:80 ESTABLISHED
TCP 192.168.1.13:2454 211.100.26.88:80 ESTABLISHED
TCP 192.168.1.13:2455 211.100.26.88:80 ESTABLISHED
TCP 192.168.1.13:2458 60.28.252.222:80 TIME_WAIT
TCP 192.168.1.13:2459 60.28.252.222:80 TIME_WAIT
TCP 192.168.1.13:2462 211.100.26.123:80 TIME_WAIT
TCP 192.168.1.13:2463 211.100.26.88:80 ESTABLISHED
TCP 192.168.1.13:2464 211.100.26.88:80 ESTABLISHED
TCP 192.168.1.13:2465 211.100.26.88:80 ESTABLISHED
TCP 192.168.1.13:2466 211.100.26.88:80 ESTABLISHED
TCP 192.168.1.13:2467 211.100.26.88:80 ESTABLISHED
TCP 192.168.1.13:2468 211.100.26.88:80 ESTABLISHED
TCP 192.168.1.13:2469 211.100.26.88:80 ESTABLISHED
TCP 192.168.1.13:2471 60.28.252.222:80 TIME_WAIT
UDP 0.0.0.0:445 *:*
UDP 0.0.0.0:1260 *:*
UDP 0.0.0.0:1309 *:*
UDP 0.0.0.0:1310 *:*
UDP 0.0.0.0:1382 *:*
UDP 0.0.0.0:1384 *:*
UDP 0.0.0.0:1426 *:*
UDP 0.0.0.0:1522 *:*
UDP 0.0.0.0:1523 *:*
UDP 0.0.0.0:1572 *:*
UDP 0.0.0.0:1750 *:*
UDP 0.0.0.0:10000 *:*
UDP 0.0.0.0:10001 *:*
UDP 0.0.0.0:10002 *:*
UDP 0.0.0.0:10003 *:*
UDP 0.0.0.0:15000 *:*
UDP 127.0.0.1:123 *:*
UDP 127.0.0.1:1300 *:*
UDP 127.0.0.1:1412 *:*
UDP 127.0.0.1:1763 *:*
UDP 127.0.0.1:2063 *:*
UDP 127.0.0.1:2065 *:*
UDP 127.0.0.1:2066 *:*
UDP 127.0.0.1:2080 *:*
UDP 172.27.5.1:123 *:*
UDP 172.27.5.1:137 *:*
UDP 172.27.5.1:138 *:*
UDP 192.168.1.13:9 *:*
UDP 192.168.1.13:123 *:*
UDP 192.168.1.13:137 *:*
UDP 192.168.1.13:138 *:*

C:\>