1. Find the distance of the point x = (2, 4, −1) of R3 from the subspace W consisting of all vectors of the form (a, − 2a,b).

(4) 如果從你的電腦同時開兩個瀏覽器視窗、且皆連到同㇐個網站。請問在這兩個連線的 TCP Segment 裡，有哪些(個)欄位值是㇐樣的？(只看 ClientServer 方向) A) The source IP address. B) The destination IP address. C) The source port. D) The destination port. E) 前述欄位都不㇐樣。