[考題] 97年鐵路計概
[問題一]
將 1234567 七個數目依某順序插入一個空的二元搜尋樹(Binary Search Tree)後,
所得的二元搜尋樹如下圖所示:
4
/ \
2 6
/ \ / \
1 3 5 7
總共有幾種可能的插入順序?
(A)40 種 (B)48 種 (C)80 種 (D) 96 種
答案:(C)
這題請問一下要如何計算??
[問題二]
假設一路由器(router)的路徑表格(routing table)如下圖所示。
路由器可以將收到的封包傳給直接相連的網路或其它路由器。選擇路徑的
原則是最長字首相同(longest prefix match)。如果路由器要將封包傳給位
址 140.252.13.45,該透過那一個介面(interface)?
Destination Gateway Flags Refcnt Use Interface
-----------------------------------------------------------
140.252.13.65 140.252.13.35 UGH 0 171 le0
127.0.0.1 127.0.0.1 UH 1 766 lo0
140.252.1.183 140.252.1.29 UH 0 0 emd0
140.252.13.32 140.252.13.33 U 8 99551 sl0
default 140.252.1.183 UG 1 2955 viv0
(A)le0 (B)lo0 (C)emd0 (D) sl0
答案:(D)
這題想請問一下,封包要傳給的位址140.252.12.45是要
看Destination還是看Gateway??為什麼?
麻煩知道的大大說明一下~感謝><...
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 114.34.31.118
推
06/19 19:31, , 1F
06/19 19:31, 1F
→
06/19 19:32, , 2F
06/19 19:32, 2F
→
06/19 19:35, , 3F
06/19 19:35, 3F
→
06/19 19:38, , 4F
06/19 19:38, 4F
推
06/19 19:52, , 5F
06/19 19:52, 5F
推
06/19 19:55, , 6F
06/19 19:55, 6F
推
06/19 19:57, , 7F
06/19 19:57, 7F
→
06/19 19:58, , 8F
06/19 19:58, 8F
→
06/19 19:59, , 9F
06/19 19:59, 9F
→
06/19 20:00, , 10F
06/19 20:00, 10F
→
06/19 20:01, , 11F
06/19 20:01, 11F
→
06/19 20:03, , 12F
06/19 20:03, 12F
→
06/19 20:03, , 13F
06/19 20:03, 13F
→
06/19 20:03, , 14F
06/19 20:03, 14F
→
06/19 20:04, , 15F
06/19 20:04, 15F
→
06/19 20:05, , 16F
06/19 20:05, 16F
→
06/19 20:06, , 17F
06/19 20:06, 17F
→
06/19 20:07, , 18F
06/19 20:07, 18F
推
06/19 20:22, , 19F
06/19 20:22, 19F
→
06/19 20:23, , 20F
06/19 20:23, 20F
→
06/19 20:24, , 21F
06/19 20:24, 21F
→
06/19 20:27, , 22F
06/19 20:27, 22F
推
06/19 20:27, , 23F
06/19 20:27, 23F
→
06/19 20:28, , 24F
06/19 20:28, 24F
→
06/19 20:29, , 25F
06/19 20:29, 25F
推
06/19 20:35, , 26F
06/19 20:35, 26F
推
06/19 20:45, , 27F
06/19 20:45, 27F
→
06/19 20:46, , 28F
06/19 20:46, 28F
推
06/19 21:21, , 29F
06/19 21:21, 29F
推
06/19 22:01, , 30F
06/19 22:01, 30F
→
06/19 22:01, , 31F
06/19 22:01, 31F
推
06/19 22:08, , 32F
06/19 22:08, 32F
→
06/20 00:56, , 33F
06/20 00:56, 33F