Différences

Ci-dessous, les différences entre deux révisions de la page.

--- cours:bat4:netipws:ipudptcpsummary [2018/03/07 16:13] – [Internet Communications and Protocol : Key Ideas] tigli
+++ cours:bat4:netipws:ipudptcpsummary [2018/03/20 14:45] (Version actuelle) – [Internet Communications and Protocol : Key Ideas] tigli
@@ Ligne 20: / Ligne 20: @@
   * a network mask allows to specify the number of bits of the netid. All the bits corresponding to the netid are equal to 1 and the other to 0. Thus for 167.145.134.32/18 (the means 18 bits to code the netid), the mask is 255.255.192.0.
   * For each network, size of subnetid + size of hostid  = 32 - size of netid. Be careful, <netid>|0..0 and <netid>|1..1 are use respectively to indentify the corresponding network and the broadcast adress (to send data to all the interfaces of the <netid> network at the same time).
-  * So, for each network coded on k bits, a maximum of 2^(32-k-1) adresses are available for hosts.
+  * So, for each network coded on k bits, a maximum of 2^(32-k) - 2 adresses are available for hosts.
 === Exercices :  ===